JPH03182050A - Manufacture of positive electrode active substance for lithium battery - Google Patents
Manufacture of positive electrode active substance for lithium batteryInfo
- Publication number
- JPH03182050A JPH03182050A JP1321952A JP32195289A JPH03182050A JP H03182050 A JPH03182050 A JP H03182050A JP 1321952 A JP1321952 A JP 1321952A JP 32195289 A JP32195289 A JP 32195289A JP H03182050 A JPH03182050 A JP H03182050A
- Authority
- JP
- Japan
- Prior art keywords
- powder
- mno2
- positive electrode
- nitric acid
- electrode active
- 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.)
- Pending
Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 19
- 229910052744 lithium Inorganic materials 0.000 title claims description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000013543 active substance Substances 0.000 title abstract 2
- 239000000843 powder Substances 0.000 claims abstract description 42
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 22
- 239000011812 mixed powder Substances 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 7
- 238000001035 drying Methods 0.000 claims abstract description 3
- 239000007774 positive electrode material Substances 0.000 claims description 15
- 230000003647 oxidation Effects 0.000 claims description 7
- 238000007254 oxidation reaction Methods 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 5
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 abstract description 56
- 239000000203 mixture Substances 0.000 abstract description 5
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 abstract description 3
- 230000010354 integration Effects 0.000 abstract 2
- 239000000126 substance Substances 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 8
- 239000011149 active material Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 239000004480 active ingredient Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 description 1
- 229910001486 lithium perchlorate Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000005070 ripening Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、リチウム電池用正極活物質の製造法に関する
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a positive electrode active material for lithium batteries.
従来、ＭｎＯ２は、リチウム−次電池用正極活物質とし
てばかりでなく、近年、リチウム二次電池用正極活物質
として使用し、電池特性上、高電圧を有し、而も価格的
に安価なため、注目されている。Conventionally, MnO2 has been used not only as a positive electrode active material for lithium secondary batteries, but also as a positive electrode active material for lithium secondary batteries in recent years, because it has high voltage due to battery characteristics and is inexpensive. ,Attention has been paid.
このＭｎＯ２を、上記活物質として使用するには、水分
を含有する場合は、活物質としての作動に悪影響を及す
ので、これを加熱乾燥する必要がある。又、特に、その
リチウム二次電池の正極活物質としての充放電特性を向
上せしめるため、他の金属酸化物と混ぜて、その混合物
を加圧して一体化物となし、−ａに、圧粉成形体とし、
次でこれを加熱処理後、粉砕し、その混合粉即ち、複合
酸化物粉を正極活物質として使用することが行われてい
る。In order to use this MnO2 as the above-mentioned active material, it is necessary to heat and dry it, since if it contains water, it will have an adverse effect on its operation as an active material. In particular, in order to improve the charging and discharging characteristics as a positive electrode active material for lithium secondary batteries, the mixture is mixed with other metal oxides, the mixture is pressurized to form an integrated product, and -a is powder-molded. As a body,
Next, this is heat-treated and pulverized, and the mixed powder, that is, the composite oxide powder, is used as a positive electrode active material.
然し乍ら、従来のように、ＭｎＯ２粉単独又は他の金属
酸化物の圧粉成形体を加熱処理すると、ＭｎＯ２は、熟
処理した際に、平衡蒸気圧との関係で酸素を失い易く、
その粉体の一部は、Ｍ ｎ、 Ｏ。However, when MnO2 powder alone or a compacted compact of other metal oxides is heat-treated as in the past, MnO2 tends to lose oxygen due to the equilibrium vapor pressure during ripening.
A part of the powder contains M n, O.
などの低級酸化物になり、それだけ、有効成分であるＭ
ｎＯ２の減少をもたらすことがしばしば見られる。換言
すれば、加熱処理の結果、ＭｎＯ□粉の中には、無効な
Ｍｎ、Ｏ，粉が混在すること）なる、即ち、このＭｎ、
０３は、リチウムイオンを可及的に、インターカレート
、脱インターカレートできないため、加熱処理後のＮｎ
Ｏ，粉に該Ｍｎ２へが混入することは、電池の内部抵抗
の増大の原因となり、充放電に役立たないため、それだ
け、リチウム電池の放電容量低下、サイクル寿命の短縮
をもたらす。It becomes a lower oxide such as M, which is the active ingredient.
It is often seen that this results in a decrease in nO2. In other words, as a result of the heat treatment, ineffective Mn, O, and powder are mixed in the MnO□ powder, that is, this Mn,
03 cannot intercalate or deintercalate lithium ions as much as possible, so Nn after heat treatment
The mixing of O and Mn2 into the powder causes an increase in the internal resistance of the battery and is not useful for charging and discharging, resulting in a corresponding decrease in the discharge capacity and cycle life of the lithium battery.
本発明は、上記従来の不都合を解消し、Ｍｎ。 The present invention solves the above-mentioned conventional disadvantages and makes Mn.
へなどの低級酸化物が含有しない充放電特性、サイクル
寿命の優れたリチウム電池をもたらすリチウム電池用正
極活物質の製造法を提供するもので、ＭｎＯ２粉単独又
はこれとその他の金属酸化物粉との混合粉を加圧して一
体化物としたものを加熱処理した後、ＭｎＯ，粉単独又
は粉砕した混合粉を硝酸で酸化処理し、次で加熱乾燥す
ることを特徴とする。The present invention provides a method for producing a positive electrode active material for lithium batteries that provides a lithium battery with excellent charge/discharge characteristics and cycle life that does not contain lower oxides such as MnO2 powder alone or in combination with other metal oxide powders. The method is characterized in that the mixed powder is pressurized to form an integrated product, which is then heat treated, the MnO powder alone or the pulverized mixed powder is oxidized with nitric acid, and then heated and dried.
本発明の上記の製造法によれば、ＭｎＯ７粉は、加熱処
理によってその一部がＭｎ、へなどの低級酸化物になっ
たとしても、次に硝酸で酸化処理すれば、その低級酸化
物は、再び有効成分であるＭｎＯ２に復元する。この場
合、硝酸処理は、粉状で行われるので、硝酸との接触が
良好に行われるのでその酸化処理並に加熱乾燥処理が良
好に行われる。このようにして低級酸化物を含まない本
発明のＭｎＯ２粉が得られる。その結果これをリチウム
電池の正極活物質として使用し、その放電容量、サイク
ル寿命を著しく改善する。According to the above-mentioned manufacturing method of the present invention, even if a part of the MnO7 powder becomes lower oxides such as Mn and H2 due to heat treatment, if the MnO7 powder is then oxidized with nitric acid, the lower oxides will be removed. , it is restored to the active ingredient MnO2 again. In this case, since the nitric acid treatment is carried out in powder form, contact with the nitric acid is carried out well, so that the oxidation treatment and the heat drying treatment are carried out well. In this way, the MnO2 powder of the present invention, which does not contain lower oxides, can be obtained. As a result, this material can be used as a positive electrode active material in lithium batteries, and its discharge capacity and cycle life can be significantly improved.
更にこの場合、上記の硝酸で処理したＭｎＯ２粉を、加
熱して水分の除去に加え、脱硝酸処理を行うことにより
、硝酸残留のない更に良質のリチウム電池用正極活物質
が得られる。Furthermore, in this case, by heating the MnO2 powder treated with nitric acid to remove water and denitrifying the powder, a higher quality positive electrode active material for lithium batteries without residual nitric acid can be obtained.
次に、本発明の実施例を次に説明する。 Next, embodiments of the present invention will be described below.
市販の原料ＭｎＯ２粉単独を加熱して含有水分を除去す
る。或いは、又は該ＭｎＯ３に適当なモル比で、例えば
、１０モル％に相当するように市販のＨＯへ、Ｔｅａ、
、Ｃｒ、へなどの任意の他の金属酸化物粉の少なくとも
一種を添加し混合して戒る混合粉を、適当な圧力で、例
えば３ｔ／ｄで加圧して、一体化物、一般に、いわゆる
圧粉成形体とし、これを６５０℃で１６時間加熱処理し
、ＭｎＯ２の結晶配列を行った後、これを粉砕し、複合
酸化物混合粉を得る。Commercially available raw material MnO2 powder alone is heated to remove the moisture contained therein. Alternatively, Tea,
, Cr, etc., and the mixed powder is pressurized at an appropriate pressure, for example, 3 t/d, to form an integrated product, generally known as pressure A powder compact is formed, which is heat-treated at 650° C. for 16 hours to align MnO2 crystals, and then ground to obtain a composite oxide mixed powder.
このようにして加熱処理されたＭｎＯ２粉単独、及び複
合酸化物混合粉につき、Ｘ１１回折などで検査した所、
原料ＭｎＯ２粉の一部は、Ｍｎ、Ｏ，に還元しているこ
とが認められた０次に、このＭｎＯ２粉及び混合粉に硝
酸を夫々添加し、１〜２時間放置する。硝酸は、例えば
、６０％程度の濃硝酸水溶液を使用する。When the MnO2 powder alone and the composite oxide mixed powder heat-treated in this way were examined by X11 diffraction, etc.,
Part of the raw MnO2 powder was found to have been reduced to Mn, O, and then nitric acid was added to the MnO2 powder and mixed powder, respectively, and left for 1 to 2 hours. As the nitric acid, for example, about 60% concentrated nitric acid aqueous solution is used.
かくして、粉体全体に均一に硝酸が浸透拡散して酸化作
用が均一良好に行われる。この場合撹拌することが好ま
しい、この酸化処理したＭｎＯ７及び混合粉につき調べ
た所、先のＭｎ２へは全てＭｎＯｚに酸化復元している
ことが確認された。In this way, nitric acid permeates and diffuses uniformly throughout the powder, and the oxidizing action is performed uniformly and satisfactorily. In this case, stirring is preferable. When the oxidized MnO7 and mixed powder were examined, it was confirmed that all of the Mn2 was oxidized and restored to MnOz.
次で、この夫々を１００℃で１〜２時間加熱乾燥を行い
、ＮＩ’＋０２粉単独又は複合酸化物混合粉の乾燥粉体
が得られる。この場合、更にこれを脱硝酸処理するため
に２００℃に上昇させ、この温度で２〜３時間加熱する
ときは、水分除去に加え、脱硝酸処理を行い、硝酸残留
のない乾燥した本発明のＭｎＯ，のみから成るその単独
粉又は混合粉から成るリチウム電池用正極活物質が得ら
れる。Next, each of these powders is heated and dried at 100°C for 1 to 2 hours to obtain a dry powder of NI'+02 powder alone or a composite oxide mixed powder. In this case, the temperature is raised to 200°C for further denitrification treatment, and when heating at this temperature for 2 to 3 hours, the denitrification treatment is performed in addition to moisture removal, resulting in a dried product of the present invention with no nitric acid residue. A positive electrode active material for a lithium battery is obtained, which is made of MnO alone or in a mixed powder.
このようにして得られた正極活物質粉、即ちＭｎＯ７粉
単独又はＮｎＯ□及び複合酸化物の混合粉を、更に粉砕
し微粉化処理することが好ましい。It is preferable that the positive electrode active material powder thus obtained, that is, the MnO7 powder alone or the mixed powder of NnO□ and the composite oxide, is further pulverized and pulverized.
このようにして製造したＭｎＯ２粉単独又は複合酸化物
混合粉を原料として次のようにリチウム電池用正極を作
製する９例えば、ＭｎＯ２粉とＨｏｅ。A positive electrode for a lithium battery is prepared as follows using the thus produced MnO2 powder alone or a mixed oxide powder as a raw material.9 For example, MnO2 powder and Hoe.
粉とから成る複合酸化物の混合粉に、常法に従い、夫々
所定量のアセチレンブラック、及びテフロンディスバー
ジョンと混合し、次でその混合物を、乾燥、粉砕後、こ
れを集電体、例えばＮｉメツキ金網に充填積層し、加圧
して直径３６ｍ＋、厚さ０．４ａｍの肉薄円盤状の正極
板を製造した。Acetylene black and Teflon dispersion are mixed in predetermined amounts in accordance with a conventional method, and then the mixture is dried and pulverized, and then used as a current collector, such as Ni. The mixture was filled and laminated on a plating wire mesh and pressurized to produce a thin disk-shaped positive electrode plate with a diameter of 36 m+ and a thickness of 0.4 am.
一方、厚さ０．７５ｍのＬｉフォイルを直径３６圓に打
ち抜いて肉薄円盤状の負極板を製造した。上記の正極板
と負極板をセパレータを介して対向させて、テフロン製
のセル容器に収容し、該両極板間の空間には、１Ｈの過
塩素酸リチウムのプロピレンカーボネート溶液から成る
電解液を気液密に注入して、第１図示のリチウム電池を
製造した９図面で１は正極板、２は負極板、３は電解液
、４はセル容器、５は正極端子、６は負極端子を示す。On the other hand, a thin disc-shaped negative electrode plate was manufactured by punching out a Li foil with a thickness of 0.75 m to a diameter of 36 circles. The above positive electrode plate and negative electrode plate are placed facing each other with a separator in between and housed in a Teflon cell container, and the space between the two electrode plates is filled with an electrolytic solution consisting of a propylene carbonate solution of 1H lithium perchlorate. The lithium battery shown in Figure 1 was produced by liquid-tight injection. In the 9 drawings, 1 indicates a positive electrode plate, 2 indicates a negative electrode plate, 3 indicates an electrolytic solution, 4 indicates a cell container, 5 indicates a positive terminal, and 6 indicates a negative terminal. .
この電池を使用した時の放電特性を試験した。The discharge characteristics of this battery were tested.
その結果は、第２図に、その放電特性曲線ａで示す通り
であった。又、これにつき、その充放電サイクル特性試
験を行った。その結果は、第３図に、そのサイクル特性
曲線ｄで示す通りであった。The results were as shown by the discharge characteristic curve a in FIG. Additionally, a charge/discharge cycle characteristic test was conducted. The results were as shown by the cycle characteristic curve d in FIG.
比較のため、硝酸酸化処理を施さない、即ち、前記の６
５０℃で１６時間加熱処理した後、粉砕して得た上記と
同じＭｎＯ２と８００．とから成る複合酸化物混合粉を
原料とし、上記と同様にして、正極を作製し、これを前
記と同様にして組み込み第１図示と同じ構造の従来のリ
チウム電池を製造し、これにつき、上記と同様に、放電
特性とサイクル特性を試験した。その結果は第２図及び
第３図に夫々その放電特性曲線す及びサイクル特性向Ｍ
ｂ′で示す通りであった。For comparison, nitric acid oxidation treatment was not performed, that is, the above-mentioned 6
After heating at 50°C for 16 hours, the same MnO2 as above obtained by pulverization was mixed with 800. A positive electrode was prepared in the same manner as above using a composite oxide mixed powder consisting of the Similarly, the discharge characteristics and cycle characteristics were tested. The results are shown in Figures 2 and 3, respectively.
It was as shown by b'.
かくして、第２図及び第３図に示す両者の夫々の特性曲
線ａ及びｂ及びａ′及びｂ′を対比し、明らかなように
、硝酸酸化処理により、Ｍｎ、０３を含まない本発明の
ＭｎＯ２粉を正極活物質として使用する場合は、従来法
で作製したＭｎＯ２粉を正極活物質として使用したもの
に比し、著しく電池の容量が増大し、且つ充放電特性が
著しく向上したリチウム電池をもたらすことが分かる。Thus, by comparing the respective characteristic curves a and b and a' and b' shown in FIGS. 2 and 3, it is clear that the MnO2 of the present invention, which does not contain Mn, 03, is produced by the nitric acid oxidation treatment. When using MnO2 powder as the positive electrode active material, a lithium battery with significantly increased battery capacity and significantly improved charge/discharge characteristics is produced compared to a conventional method using MnO2 powder as the positive electrode active material. I understand that.
尚、本発明の製造法により製造したＭｎＯ２ｎＯ２全単
独活物質として使用し、前記と同様にリチウム電池の正
極板としたものも又、上記と同様に優れた放電特性とサ
イクル寿命をもたらした。Incidentally, when MnO2nO2 produced by the production method of the present invention was used as a single active material and used as a positive electrode plate of a lithium battery in the same manner as above, it also provided excellent discharge characteristics and cycle life in the same manner as above.
尚、本発明の硝酸酸化処理を行ったＭｎＯ２粉又はその
複合酸化物混合粉は、硝酸を残留させない方が好ましい
が、残留していてもＭｎ、０３などの低級酸化物を含ま
ないので、従来に比し、放電容量、サイクル寿命の向上
した電池をもたらすことに変わりはない。It is preferable that the MnO2 powder or composite oxide mixed powder thereof subjected to the nitric acid oxidation treatment of the present invention does not contain nitric acid, but even if it remains, it does not contain lower oxides such as Mn and 03, so However, it still results in a battery with improved discharge capacity and cycle life.
このように本発明によるときは、ＭｎＯ２ｎＯ２全単独
の金属酸化物粉との混合粉の一体化物を加熱処理した後
、該混合粉単独又は該一体化物を粉砕して得た複合酸化
物混合粉を、硝酸にて酸化処理するので、前記加熱処理
で生じたＭｎ。As described above, according to the present invention, after heat-treating an integrated product of a mixed powder of all MnO2nO2 and a metal oxide powder, the mixed powder alone or the composite oxide mixed powder obtained by pulverizing the integrated product is , since the oxidation treatment is performed with nitric acid, Mn generated during the heat treatment.
へその他の低級酸化物を再びＭｎＯ，に戻すことができ
るので、かＮる酸化処理しないものに比し、放電容量及
びサイクル寿命が著しく改善されるリチウム電池用正極
活物質を製造することができる効果を有し、更にその後
の加熱処理で、硝酸の除去ができ、良質の上記の優れた
活物質が得られる等の効果を有する。Since other lower oxides can be returned to MnO, it is possible to produce a positive electrode active material for lithium batteries that has significantly improved discharge capacity and cycle life compared to materials that are not subjected to oxidation treatment. In addition, nitric acid can be removed by subsequent heat treatment, and the above-mentioned excellent active material of high quality can be obtained.
第１図は、本発明で製造した活物質から戒る正極板を備
えたリチウム電池の断面図、第２図は、放電容量特性の
比較図、第３図は、サイクル寿命特性の比較図を示す。
ａ・・・本発明の活物質を使用した電池の放電特性曲線
イ・・・本発明の活物質を使用した電池のサイクル寿命
特性曲線Figure 1 is a cross-sectional view of a lithium battery equipped with a positive electrode plate made from the active material manufactured by the present invention, Figure 2 is a comparison diagram of discharge capacity characteristics, and Figure 3 is a comparison diagram of cycle life characteristics. show. a... Discharge characteristic curve of a battery using the active material of the present invention b... Cycle life characteristic curve of a battery using the active material of the present invention
Claims (1)
との混合粉を加圧して一体化したものを加熱処理した後
、該ＭｎＯ＿２粉単独又は粉砕混合粉を硝酸で酸化処理
し次で加熱乾燥することを特徴とするリチウム電池用正
極活物質の製造法。 ２、硝酸で酸化処理後の該ＭｎＯ＿２粉又は該混合粉を
加熱処理により、硝酸を除去することを特徴とする請求
項１記載のリチウム電池用正極活物質の製造法。[Claims] 1. After heat-treating the MnO_2 powder alone or a mixed powder of this and other metal oxide powder under pressure, the MnO_2 powder alone or the pulverized mixed powder is oxidized with nitric acid. A method for producing a positive electrode active material for lithium batteries, which comprises processing and then heating and drying. 2. The method for producing a positive electrode active material for a lithium battery according to claim 1, characterized in that the nitric acid is removed by heating the MnO_2 powder or the mixed powder after the oxidation treatment with nitric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1321952A JPH03182050A (en) | 1989-12-12 | 1989-12-12 | Manufacture of positive electrode active substance for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1321952A JPH03182050A (en) | 1989-12-12 | 1989-12-12 | Manufacture of positive electrode active substance for lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03182050A true JPH03182050A (en) | 1991-08-08 |
Family
ID=18138262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1321952A Pending JPH03182050A (en) | 1989-12-12 | 1989-12-12 | Manufacture of positive electrode active substance for lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03182050A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115368154A (en) * | 2022-09-05 | 2022-11-22 | 衡阳凯新特种材料科技有限公司 | Production process and equipment of silicon nitride wave-absorbing material |
-
1989
- 1989-12-12 JP JP1321952A patent/JPH03182050A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115368154A (en) * | 2022-09-05 | 2022-11-22 | 衡阳凯新特种材料科技有限公司 | Production process and equipment of silicon nitride wave-absorbing material |
| CN115368154B (en) * | 2022-09-05 | 2023-03-14 | 衡阳凯新特种材料科技有限公司 | A production process and equipment of silicon nitride absorbing material |
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