JPH06150921A - Sealed nickel-hydrogen battery - Google Patents
Sealed nickel-hydrogen batteryInfo
- Publication number
- JPH06150921A JPH06150921A JP4303630A JP30363092A JPH06150921A JP H06150921 A JPH06150921 A JP H06150921A JP 4303630 A JP4303630 A JP 4303630A JP 30363092 A JP30363092 A JP 30363092A JP H06150921 A JPH06150921 A JP H06150921A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- cobalt
- negative electrode
- nickel
- hydrogen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000001257 hydrogen Substances 0.000 title claims abstract description 24
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 24
- 239000000956 alloy Substances 0.000 claims abstract description 24
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 24
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 16
- 239000010941 cobalt Substances 0.000 claims abstract description 16
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 150000001869 cobalt compounds Chemical class 0.000 claims abstract description 5
- 239000008151 electrolyte solution Substances 0.000 claims description 17
- 239000000470 constituent Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- -1 cobalt complex ion Chemical class 0.000 claims description 6
- 229910052987 metal hydride Inorganic materials 0.000 claims description 5
- BFDHFSHZJLFAMC-UHFFFAOYSA-L nickel(ii) hydroxide Chemical compound [OH-].[OH-].[Ni+2] BFDHFSHZJLFAMC-UHFFFAOYSA-L 0.000 claims description 3
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(II) oxide Inorganic materials [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 abstract description 34
- 239000000843 powder Substances 0.000 abstract description 15
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 229910001429 cobalt ion Inorganic materials 0.000 abstract description 3
- XLJKHNWPARRRJB-UHFFFAOYSA-N cobalt(2+) Chemical compound [Co+2] XLJKHNWPARRRJB-UHFFFAOYSA-N 0.000 abstract description 3
- 238000007789 sealing Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 5
- 229910001882 dioxygen Inorganic materials 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- QLSSITLVZFHSJT-UHFFFAOYSA-N 1-(3-chlorophenyl)-n-methylpropan-2-amine Chemical compound CNC(C)CC1=CC=CC(Cl)=C1 QLSSITLVZFHSJT-UHFFFAOYSA-N 0.000 description 2
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 2
- 150000001868 cobalt Chemical class 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000682 scanning probe acoustic microscopy Methods 0.000 description 2
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229940044175 cobalt sulfate Drugs 0.000 description 1
- 229910000361 cobalt sulfate Inorganic materials 0.000 description 1
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 1
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/34—Gastight accumulators
- H01M10/345—Gastight metal hydride accumulators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電池内圧の上昇を抑制
できるようにした密閉形ニッケル水素電池に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed nickel-metal hydride battery capable of suppressing an increase in battery internal pressure.
【０００２】[0002]
【従来技術及びその問題点】今日におけるポータブル機
器の進歩は著しく、これらの機器に使用される電池に
は、高いエネルギー密度が求められており、従来から使
用されているニッケルカドミウム電池に代わり、軽量且
つ高容量のニッケル水素電池が注目されている。 とこ
ろで、ニッケル水素電池の密閉化は、ニッケルカドミウ
ム電池と同様に、電池充電時の正極から発生する酸素ガ
スを負極である水素吸蔵合金電極で消費することにより
成立している。酸素ガスは、水素吸蔵合金自体が反応し
て消費するが、その消費速度は小さく、多量の酸素ガス
が発生する充電条件下では、酸素ガスの消費速度が追い
つかず、電池内圧が上昇することがある。電池内圧の上
昇が大きくなりすぎると、電池内で発生した酸素ガスが
安全弁を通して電池外に放出され、場合によっては、こ
れに伴なって電解液等が電池外に放出されることもあ
り、サイクル特性の低下を引き起こす恐れがある。従っ
て、密閉化を実効あるものとするために、電池内圧の上
昇を充分に抑制することが求められていた。2. Description of the Related Art Advances in portable devices today are remarkable, and batteries used for these devices are required to have a high energy density. Instead of the conventionally used nickel-cadmium batteries, they are lightweight. Moreover, high-capacity nickel-hydrogen batteries are receiving attention. By the way, as in the nickel-cadmium battery, the nickel-hydrogen battery is hermetically sealed by consuming oxygen gas generated from the positive electrode at the time of battery charging at the hydrogen-absorbing alloy electrode which is the negative electrode. Oxygen gas is consumed by the hydrogen storage alloy itself reacting, but its consumption rate is low, and under charging conditions in which a large amount of oxygen gas is generated, the oxygen gas consumption rate cannot keep up and the battery internal pressure may rise. is there. If the internal pressure of the battery rises too much, oxygen gas generated in the battery will be released to the outside of the battery through the safety valve, and in some cases, the electrolyte may be released to the outside of the battery. It may cause deterioration of characteristics. Therefore, in order to make the sealing effective, it has been required to sufficiently suppress the increase in the battery internal pressure.
【０００３】[0003]
【発明の目的】本発明は、密閉形ニッケル水素電池の密
閉化を実効あるものとするために、電池内圧上昇の抑制
効果を高めた密閉形ニッケル水素電池を提供することを
目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealed nickel-hydrogen battery which has an enhanced effect of suppressing an increase in internal pressure of the battery in order to effectively seal the sealed nickel-hydrogen battery.
【０００４】[0004]
【目的を達成するための手段】本発明は、水素吸蔵合金
を主成分として含有する負極と、水酸化ニッケルを主成
分として含有する正極と、電解液と、セパレータとを、
構成材料として備えた密閉形ニッケル水素電池におい
て、上記構成材料の内の１つ以上に、コバルト化合物を
添加混合し、電解液中に生成した２価のコバルト錯イオ
ンを還元させることにより、水素吸蔵合金の表面にコバ
ルトからなる層を形成し、この負極を用いたことを特徴
とするものである。The present invention comprises a negative electrode containing a hydrogen storage alloy as a main component, a positive electrode containing nickel hydroxide as a main component, an electrolytic solution, and a separator.
In a sealed nickel-hydrogen battery provided as a constituent material, a cobalt compound is added to and mixed with one or more of the above constituent materials to reduce the divalent cobalt complex ion generated in the electrolytic solution, thereby absorbing hydrogen. It is characterized in that a layer made of cobalt is formed on the surface of the alloy and this negative electrode is used.
【０００５】[0005]
【作用】コバルト化合物は、２価のコバルト錯イオンと
して電解液中に存在することとなり、この錯イオンは、
還元されることにより、水素吸蔵合金表面に付着してコ
バルト層を形成する。このコバルト層により、負極にお
ける触媒活性、更には、ガス吸収反応速度が向上し、従
って、電池内圧の上昇が抑制される。[Function] The cobalt compound exists in the electrolytic solution as a divalent cobalt complex ion, and this complex ion is
By being reduced, it adheres to the surface of the hydrogen storage alloy and forms a cobalt layer. This cobalt layer improves the catalytic activity in the negative electrode and further the gas absorption reaction rate, and thus suppresses the rise in the internal pressure of the battery.
【０００６】[0006]
【実施例】以下、本発明の実施例を図に基づいて説明す
る。図１及び図１のII矢視図である図２は本発明の一実
施例の密閉形ニッケル水素電池の外観図である。本実施
例の電池は、小型、角形のものである。Embodiments of the present invention will be described below with reference to the drawings. 1 and FIG. 2, which is an arrow view of FIG. 1, are external views of a sealed nickel-metal hydride battery according to an embodiment of the present invention. The battery of this embodiment is a small, prismatic battery.
【０００７】本実施例の電池は、次のような正極、電解
液、セパレータ、及び負極を構成材料として備えた３０
００ｍＡｈ形のものである。The battery of this embodiment is equipped with the following positive electrode, electrolytic solution, separator, and negative electrode as constituent materials.
It is of the 00 mAh type.
【０００８】正極は、亜鉛が固溶体化された高密度水酸
化ニッケル粉末をペースト状としてニッケル繊維基板に
充填してなるものであり、セパレータは、ポリアミド不
織布からなるものであり、電解液は、７規定の水酸化カ
リウム及び１規定の水酸化リチウムからなるものであ
る。The positive electrode is formed by filling a nickel fiber substrate in the form of paste with a high-density nickel hydroxide powder in which zinc is made into a solid solution, the separator is made of polyamide nonwoven fabric, and the electrolytic solution is 7 It is composed of normal potassium hydroxide and normal lithium hydroxide.
【０００９】そして、負極は、水素吸蔵合金であるＭｍ
ＮｉＡｌＣｏ系合金粉末に合金量に対して０．２％の一
酸化コバルト粉末を添加混合したものをペースト状とし
てニッケル繊維基板に充填し、この充填体を、電解液に
浸漬し、充電反応に供することにより、形成されたもの
である。図３は上記充填体における一酸化コバルトの状
態変化を示す図である。上記充填体を電解液に浸漬する
と、混合されている一酸化コバルト１１は、２価のコバ
ルト錯イオンとなって電解液中に溶出し、上記合金粉末
間の隙間に入り込んでいく（図３（ｂ））。そして、充
電反応に供すると、上記錯イオンは、還元されてコバル
トとなり、上記合金粉末の表面に付着して層１２を形成
する（図３（ｃ））。即ち、本実施例で用いる負極の上
記合金粉末表面には、コバルトからなる層が形成されて
いる。なお、１回の充電だけでは還元が不十分な場合に
は、充放電を繰り返してもよい。The negative electrode is Mm which is a hydrogen storage alloy.
A nickel fiber substrate is filled with a mixture of NiAlCo alloy powder and 0.2% of cobalt monoxide powder with respect to the alloy amount, and the paste is filled into the nickel fiber substrate, and the filled body is immersed in an electrolytic solution and subjected to a charging reaction. It is formed by this. FIG. 3 is a diagram showing a change in the state of cobalt monoxide in the filling body. When the filling body is dipped in the electrolytic solution, the mixed cobalt monoxide 11 becomes divalent cobalt complex ions and is eluted into the electrolytic solution to enter the gap between the alloy powders (Fig. 3 ( b)). Then, when subjected to a charging reaction, the complex ions are reduced to cobalt and adhere to the surface of the alloy powder to form a layer 12 (FIG. 3 (c)). That is, a layer made of cobalt is formed on the surface of the alloy powder of the negative electrode used in this example. If the reduction is insufficient with only one charge, the charge and discharge may be repeated.
【００１０】図４はオージェ電子分光法によって求め
た、上記構成の負極の水素吸蔵合金粉末表面におけるコ
バルトのデプスプロファイルを示す図である。なお、比
較例として、一酸化コバルトを混合していない負極のデ
ータも示す。図中、Ａは本実施例の負極、Ｂは比較例の
負極である。図４からわかるように、本実施例の負極の
上記合金粉末表面では、コバルトが多く検出されてお
り、上記合金粉末表面にはコバルトからなる層が形成さ
れている。FIG. 4 is a diagram showing the depth profile of cobalt on the surface of the hydrogen-absorbing alloy powder of the negative electrode having the above structure, which is obtained by Auger electron spectroscopy. In addition, as a comparative example, data of a negative electrode not mixed with cobalt monoxide is also shown. In the figure, A is the negative electrode of this example, and B is the negative electrode of the comparative example. As can be seen from FIG. 4, a large amount of cobalt was detected on the surface of the alloy powder of the negative electrode of the present example, and a layer made of cobalt was formed on the surface of the alloy powder.
【００１１】図５は上記構成の電池の充電時における電
池電圧の変化Ｃ及び電池内圧の変化Ｄを示す図であり、
図６は上記構成の電池の放電特性を示す図である。な
お、充電は２０℃、０．３ＣｍＡで１５０％、放電は２
０℃、０．２ＣｍＡで電池電圧が１．０Ｖになるまで、
及び２０℃、１．０ＣｍＡで電池電圧が１．０Ｖになる
まで行なった。図６において、Ｅ1は０．２ＣｍＡの場
合、Ｅ2は１．０ＣｍＡの場合を示す。FIG. 5 is a diagram showing a change C of the battery voltage and a change D of the battery internal pressure during charging of the battery having the above structure,
FIG. 6 is a diagram showing the discharge characteristics of the battery having the above structure. The charge is 150% at 20 ° C and 0.3 CmA, and the discharge is 2
Until the battery voltage becomes 1.0V at 0 ° C and 0.2CmA,
And at 20 ° C. and 1.0 CmA until the battery voltage became 1.0V. In FIG. 6, E 1 is 0.2 CmA and E 2 is 1.0 CmA.
【００１２】図５、６からわかるように、上記構成の電
池によれば、電池内圧の上昇は抑制され、良好な放電特
性が得られている。これは、負極の上記合金粉末表面に
付着して層を形成したコバルトにより、負極における触
媒活性、更には、ガス吸収反応速度が向上したからであ
る。As can be seen from FIGS. 5 and 6, according to the battery having the above structure, the rise in the battery internal pressure is suppressed and good discharge characteristics are obtained. This is because the cobalt that adhered to the surface of the alloy powder of the negative electrode to form a layer improved the catalytic activity in the negative electrode and further the gas absorption reaction rate.
【００１３】なお、上記構成の電池では、負極の上記合
金粉末に添加混合した一酸化コバルトの量を０．２％と
したが、これに限るものではなく、僅かでも添加混合し
ておけば、同様の作用効果を奏する。図７は一酸化コバ
ルトの添加量と充電時における電池内圧の上昇量との関
係を示す図である。なお、充電条件は、０．３ＣｍＡで
１５０％までである。図７からは、一酸化コバルトを僅
かでも添加しておけば作用効果があり、電池内圧の上昇
を充分に抑制できることがわかる。In the battery having the above structure, the amount of cobalt monoxide added and mixed in the alloy powder of the negative electrode is set to 0.2%, but the amount is not limited to this, and if the amount is small, it may be added. The same effect is obtained. FIG. 7 is a graph showing the relationship between the amount of cobalt monoxide added and the amount of increase in battery internal pressure during charging. The charging condition is 0.3 CmA and up to 150%. From FIG. 7, it can be seen that even if a small amount of cobalt monoxide is added, there is a working effect, and an increase in battery internal pressure can be sufficiently suppressed.
【００１４】[0014]
【別の実施例】一酸化コバルトは負極のみに添加する場
合に限るものではなく、その他の電池の構成材料である
正極、電解液、又はセパレータに添加してもよい。即
ち、一酸化コバルトは、電池の構成材料である負極、正
極、電解液、及びセパレータの内の、少なくとも１つの
構成材料に添加されていればよく、同様の作用効果を奏
する。これは、次の理由による。即ち、２価のコバルト
からなる一酸化コバルトは、アルカリ電解液中で生成す
るコバルトイオンが２価であるため、アルカリ電解液に
化学的に溶解可能であり、このため、一酸化コバルトを
正極、負極、又はセパレータに添加しても、電解液中に
コバルトイオンが生成されるからである。例えば、正極
に添加した場合には、正極中の一酸化コバルトは、２価
のコバルト錯イオンとなって電解液中に溶出し、その錯
イオンは、拡散して負極側へ行き、負極の合金粉末間の
隙間に入り込んでいき、充電反応によって還元されてコ
バルトとなって合金粉末表面に層を形成する。セパレー
タに添加した場合も、同様に、溶出、拡散、及び還元と
進む。電解液に添加した場合は、当初から錯イオンの状
態にあり、同様に、拡散、及び還元と進む。[Other Examples] Cobalt monoxide is not limited to the case of being added only to the negative electrode, and may be added to the positive electrode, the electrolytic solution, or the separator, which is another constituent material of the battery. That is, cobalt monoxide has only to be added to at least one constituent material of the negative electrode, the positive electrode, the electrolytic solution, and the separator, which are the constituent materials of the battery, and has the same operational effect. This is for the following reason. That is, cobalt monoxide composed of divalent cobalt can be chemically dissolved in the alkaline electrolyte because the cobalt ions generated in the alkaline electrolyte are divalent, and therefore cobalt monoxide can be used as a positive electrode, This is because cobalt ions are generated in the electrolytic solution even when added to the negative electrode or the separator. For example, when it is added to the positive electrode, cobalt monoxide in the positive electrode becomes divalent cobalt complex ions and is eluted into the electrolytic solution, and the complex ions diffuse and go to the negative electrode side to form an alloy It enters into the gaps between the powders and is reduced by the charging reaction to become cobalt, forming a layer on the surface of the alloy powder. When added to the separator, the process similarly proceeds with elution, diffusion, and reduction. When added to the electrolytic solution, it is in the state of complex ions from the beginning, and similarly, diffusion and reduction proceed.
【００１５】また、一酸化コバルトの代わりに、水酸化
コバルト又は硫酸コバルト等の２価のコバルト塩を添加
してもよく、同様の作用効果を奏する。Further, instead of cobalt monoxide, a divalent cobalt salt such as cobalt hydroxide or cobalt sulfate may be added, and the same effect is obtained.
【００１６】また、本発明は、円筒形の密閉形ニッケル
水素電池にも、もちろん適用でき、更に、その他の種々
の形状の密閉形ニッケル水素電池にも適用できる。Further, the present invention can be applied not only to a cylindrical sealed nickel-hydrogen battery, but also to various other sealed nickel-hydrogen batteries.
【００１７】[0017]
【発明の効果】以上のように、本発明の密閉形ニッケル
水素電池によれば、電池の構成材料である負極、正極、
電解液、及びセパレータの内の、１つ以上の構成材料
に、コバルト化合物を添加混合し、電解液中に生成した
２価のコバルト錯イオンを還元させることにより、水素
吸蔵合金の表面にコバルトからなる層を形成し、この負
極を用いたので、上記合金表面のコバルト層により、負
極における触媒活性、更には、ガス吸収反応速度を向上
でき、従って、電池内圧の上昇を充分に抑制でき、密閉
化を実効あるものにできる。As described above, according to the sealed nickel-metal hydride battery of the present invention, the negative electrode, the positive electrode, which are the constituent materials of the battery,
By adding and mixing a cobalt compound to one or more constituent materials of the electrolytic solution and the separator and reducing the divalent cobalt complex ions generated in the electrolytic solution, cobalt is formed on the surface of the hydrogen storage alloy. Since this layer was formed by using this negative electrode, the cobalt layer on the surface of the alloy described above can improve the catalytic activity in the negative electrode, and further the gas absorption reaction rate, and thus can sufficiently suppress the increase in the internal pressure of the battery and seal Can be made effective.
【図１】 本発明の一実施例の密閉形ニッケル水素電池
の外観図である。FIG. 1 is an external view of a sealed nickel-metal hydride battery according to an embodiment of the present invention.
【図２】 図１のII矢視図である。FIG. 2 is a view on arrow II in FIG.
【図３】 上記実施例の密閉形ニッケル水素電池の負極
の形成過程における一酸化コバルトの状態変化を示す図
である。FIG. 3 is a diagram showing changes in the state of cobalt monoxide in the process of forming the negative electrode of the sealed nickel-hydrogen battery of the above example.
【図４】 上記実施例の密閉形ニッケル水素電池の負極
の合金粉末表面における、オージェ電子分光法によって
求めた、コバルトのデプスプロファイルを示す図であ
る。FIG. 4 is a diagram showing a cobalt depth profile obtained by Auger electron spectroscopy on the alloy powder surface of the negative electrode of the sealed nickel-hydrogen battery of the above example.
【図５】 上記実施例の密閉形ニッケル水素電池の充電
時における電池電圧の変化及び電池内圧の変化を示す図
である。FIG. 5 is a diagram showing changes in battery voltage and changes in battery internal pressure during charging of the sealed nickel-hydrogen battery of the above example.
【図６】 上記実施例の密閉形ニッケル水素電池の放電
特性を示す図である。FIG. 6 is a diagram showing discharge characteristics of the sealed nickel-hydrogen battery of the above example.
【図７】 一酸化コバルトの添加量と充電時における電
池内圧の上昇量との関係を示す図である。FIG. 7 is a graph showing the relationship between the amount of cobalt monoxide added and the amount of increase in battery internal pressure during charging.
１１ 一酸化コバルト １２ 層 11 Cobalt monoxide 12 layers
Claims (1)
極と、水酸化ニッケルを主成分として含有する正極と、
電解液と、セパレータとを、構成材料として備えた密閉
形ニッケル水素電池において、上記構成材料の内の１つ
以上に、コバルト化合物を添加混合し、電解液中に生成
した２価のコバルト錯イオンを還元させることにより、
水素吸蔵合金の表面にコバルトからなる層を形成し、こ
の負極を用いたことを特徴とする密閉形ニッケル水素電
池。1. A negative electrode containing a hydrogen storage alloy as a main component, and a positive electrode containing nickel hydroxide as a main component,
In a sealed nickel-hydrogen battery including an electrolytic solution and a separator as constituent materials, a divalent cobalt complex ion generated in the electrolytic solution by adding and mixing a cobalt compound to one or more of the constituent materials. By reducing
A sealed nickel-metal hydride battery characterized in that a layer made of cobalt is formed on the surface of a hydrogen storage alloy and this negative electrode is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4303630A JP2982521B2 (en) | 1992-11-13 | 1992-11-13 | Sealed nickel-metal hydride battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4303630A JP2982521B2 (en) | 1992-11-13 | 1992-11-13 | Sealed nickel-metal hydride battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06150921A true JPH06150921A (en) | 1994-05-31 |
| JP2982521B2 JP2982521B2 (en) | 1999-11-22 |
Family
ID=17923302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4303630A Expired - Lifetime JP2982521B2 (en) | 1992-11-13 | 1992-11-13 | Sealed nickel-metal hydride battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2982521B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5837317A (en) * | 1996-03-08 | 1998-11-17 | Matsushita Electric Industrial Co., Ltd. | Method of producing hydrogen storage alloy for battery |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006107966A (en) * | 2004-10-07 | 2006-04-20 | Sanyo Electric Co Ltd | Nickel / hydrogen storage battery |
-
1992
- 1992-11-13 JP JP4303630A patent/JP2982521B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5837317A (en) * | 1996-03-08 | 1998-11-17 | Matsushita Electric Industrial Co., Ltd. | Method of producing hydrogen storage alloy for battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2982521B2 (en) | 1999-11-22 |
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