WO2022007021A1 - 一种碳包覆富锂氧化物复合材料及其制备方法 - Google Patents
一种碳包覆富锂氧化物复合材料及其制备方法 Download PDFInfo
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- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
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- C01G51/00—Compounds of cobalt
- C01G51/40—Complex oxides containing cobalt and at least one other metal element
- C01G51/42—Complex oxides containing cobalt and at least one other metal element containing alkali metals, e.g. LiCoO2
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- H01M10/05—Accumulators with non-aqueous electrolyte
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- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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- H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
- H01M4/52—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron
- H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/40—Electric properties
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- H—ELECTRICITY
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- H01M2004/021—Physical characteristics, e.g. porosity, surface area
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- H—ELECTRICITY
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- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/028—Positive electrodes
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- 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
Definitions
- the invention relates to the technical field of lithium supplementary additives for positive electrodes of lithium batteries, in particular to a carbon-coated lithium-rich oxide composite material and a preparation method thereof.
- Lithium-ion batteries have the advantages of high energy density and long cycle life, and have a wide range of applications in consumer electronics, power batteries, and energy storage.
- part of the electrolyte will undergo a reduction reaction on the surface of the negative electrode, forming a dense solid-state electrolyte interface layer, consuming the active lithium in the positive electrode active material, resulting in irreversible capacity loss; in addition, the positive electrode Some irreversible reactions will also occur in the material during the first charge and discharge process, reducing the active lithium content in the lithium battery, and these side reactions will reduce the energy density of the lithium ion battery.
- the irreversible capacity loss of the lithium-ion battery is compensated by the method of supplementing lithium, so that the capacity of the positive electrode material can be recovered, and the energy density of the lithium-ion battery can be improved, which has attracted the attention of relevant staff.
- Existing lithium replenishment technologies mainly include schemes such as "adding lithium powder to the surface of the negative electrode sheet", “spraying or dripping an organic lithium solution on the surface of the negative electrode sheet”, and “electrochemical method” and other pre-lithiation schemes.
- the above methods have high environmental requirements and certain risks, and improper operation may easily lead to accidents.
- the positive electrode By adding a small amount of lithium-rich oxide to the positive electrode material, the positive electrode can be supplemented with lithium in the existing production process, and the energy density of the battery can be improved.
- Li 5 FeO 4 and Li 6 CoO 4 with anti-fluorite structure have broad application prospects in lithium supplementation technology due to their ultra-high specific capacity and irreversibility.
- the purpose of the present invention is to overcome the problems that the existing lithium replenishment methods have high environmental requirements and certain risks, and provide a carbon-coated lithium-rich oxide composite material and a preparation method thereof, which can be used in
- the carbon-coated lithium-rich oxide composite material is directly prepared on the existing cathode material production line, which is scalable and economical; and the coated carbon layer can effectively overcome the defect of insufficient conductivity of the lithium-rich metal oxide.
- Lithium oxide can provide sufficient active lithium for the cathode material and improve the energy density of lithium batteries.
- one aspect of the present invention provides a method for preparing a carbon-coated lithium-rich oxide composite material, the method comprising the following steps:
- step (3) Mixing the pulverized lithium-rich oxide in step (2) with a carbon source, and sintering to obtain a carbon-coated lithium-rich oxide composite material.
- the iron source is one or more of ferric oxide, ferric tetroxide, ferric oxyhydroxide, ferric nitrate and ferric citrate.
- the cobalt source is one or more of cobaltous oxide, cobalt tetroxide, cobalt carbonate, cobalt sulfate, cobalt chloride and cobalt nitrate.
- the lithium source is one or more of lithium carbonate, lithium hydroxide monohydrate, lithium hydroxide anhydrous and lithium oxide.
- the sintering process includes: placing an iron source or a mixture of a cobalt source and a lithium source in a sintering furnace, and under inert gas conditions, the temperature is increased to a sintering temperature.
- the first preset heating rate is 1-10° C./min.
- the first sintering temperature is 500-1000° C.; the first sintering time is 3-60 h.
- the lithium-rich oxide is pulverized to an average particle size of 2-50 ⁇ m.
- the carbon source is one or more of conductive carbon black, ketjen black, carbon nanotubes, acetylene black, vapor grown carbon fiber, graphene and biomass carbon.
- the proportion of the carbon source is 0.5-10% by weight.
- the sintering process includes: after uniformly mixing the pulverized lithium-rich oxide with the carbon source, under inert gas conditions, the temperature is raised to the second sintering temperature at a second preset heating rate Sintering is carried out.
- the second preset heating rate is 1-10°C/min.
- the second sintering temperature is 200-600° C.; the second sintering time is 2-20 h.
- a second aspect of the present invention provides a carbon-coated lithium-rich oxide composite material prepared by the aforementioned method, characterized in that the carbon-coated lithium-rich oxide composite material includes a carbon layer and a carbon layer coated with a carbon layer.
- Lithium-rich oxide wherein the lithium-rich oxide is Li 5 FeO 4 or Li 6 CoO 4 .
- the carbon-coated lithium-rich oxide composite material prepared by the method of the invention can overcome the defect of insufficient conductivity of the lithium-rich material, has good electrochemical performance, and can effectively make up for the activity lost during the first charge and discharge of the lithium battery lithium.
- Fig. 1 is the scanning electron microscope photograph of carbon-coated Li 5 FeO 4 material prepared in Example 1 of the present invention
- Fig. 2 is the scanning electron microscope photograph of carbon-coated Li 6 CoO 4 material prepared in Example 4 of the present invention
- FIG. 4 is the charge-discharge curve of the carbon-coated Li 6 CoO 4 material prepared in Example 4 of the present invention.
- One aspect of the present invention provides a method for preparing a carbon-coated lithium-rich oxide composite material, the method comprising the following steps:
- step (3) Mixing the pulverized lithium-rich oxide in step (2) with a carbon source, and sintering to obtain a carbon-coated lithium-rich oxide composite material.
- the lithium-rich oxide in the carbon-coated lithium-rich oxide material prepared by the method of the present invention has good crystallinity, no impurity phase, and good electrochemical performance; Stability can also improve its conductivity, which is beneficial to its performance.
- the iron source in step (1), can be a conventional choice in the field.
- the iron source may be one or more of ferric oxide, ferric tetroxide, ferric oxyhydroxide, ferric nitrate and ferric citrate.
- the iron source is ferric oxide.
- the cobalt source in step (1), can be a conventional choice in the field.
- the cobalt source may be one or more of cobalt oxide, cobalt tetroxide, cobalt carbonate, cobalt sulfate, cobalt chloride and cobalt nitrate.
- the cobalt source is cobaltous oxide.
- the lithium source in step (1), can be a conventional choice in the field.
- the lithium source may be one or more of lithium carbonate, lithium hydroxide monohydrate, lithium hydroxide anhydrous and lithium oxide.
- the lithium source is lithium oxide.
- the molar ratio of the lithium source to the iron source or the cobalt source needs to be controlled within an appropriate range.
- the molar ratio of the lithium source to the iron source may be 5:1, 7:1, 9:1, 11:1, 13:1, 15:1, 17:1, 19:1 1, 21:1, 23:1, 25:1, and any value within a range of any two of these point values. In a preferred embodiment, the molar ratio of the lithium source to the iron source is 5.5:1.
- the molar ratio of the lithium source to the cobalt source may be 6:1, 8:1, 10:1, 12:1, 14:1, 16:1, 18:1, 20:1 1, 22:1, 24:1, 26:1, 28:1, 30:1, and any value within a range of any two of these point values. In a preferred embodiment, the molar ratio of the lithium source to the cobalt source is 6.6:1.
- the sintering process includes: placing an iron source or a mixture of a cobalt source and a lithium source in a sintering furnace, under inert gas protection, with a first preheating Sintering is performed by setting the temperature increase rate to the first sintering temperature.
- the sintering furnace can be a conventional choice in the field, and preferably, the sintering furnace is a box furnace.
- the first preset heating rate is 1-10°C/min; specifically, for example, it can be 1°C/min, 2°C/min, 3°C/min, 4°C /min, 5°C/min, 6°C/min, 7°C/min, 8°C/min, 9°C/min or 10°C/min; preferably, the first preset heating rate is 2°C/min.
- the first sintering temperature is 500-1000°C; 850°C, 900°C, 950°C or 1000°C.
- the first sintering temperature is 850°C.
- the first sintering temperature is 700°C.
- the first sintering time is 3-60h; 40h, 43h, 48h, 52h, 55h, 57h, 60h, and any value in the range of any two of these point values.
- the first sintering time is 10-40 h, and more preferably, the first sintering time is 12-30 h.
- the first sintering time is 5-30 h, and more preferably, the first sintering time is 6-24 h.
- the lithium-rich oxide in step (2), is pulverized to an average particle size of 2-50 ⁇ m; specifically, for example, it can be 2 ⁇ m, 5 ⁇ m, 10 ⁇ m, 15 ⁇ m, 20 ⁇ m, 25 ⁇ m , 30 ⁇ m, 35 ⁇ m, 40 ⁇ m, 45 ⁇ m, 50 ⁇ m and any value in the range formed by any two of these point values; preferably, in step (2), the lithium-rich oxide is pulverized to an average particle size of 25 ⁇ m .
- the carbon source may be a conductive carbon material conventionally used in the art. Specifically, for example, it can be one or more of conductive carbon black, Ketjen black, carbon nanotubes, acetylene black, vapor-grown carbon fiber, graphene, and biomass carbon; preferably, the carbon source is conductive carbon black ; More preferably, the carbon source is conductive carbon black Super P.
- step (3) based on the total weight of the lithium-rich oxide and the carbon source, the proportion of the carbon source is 0.5-10% by weight; It is 0.5% by weight, 1% by weight, 2% by weight, 4% by weight, 6% by weight, 8% by weight, 10% by weight and any value in the range formed by any two of these point values; preferably, in step ( In 3), based on the total weight of the lithium-rich oxide and the carbon source, the proportion of the carbon source is 1% by weight.
- step (3) the sintering process includes: after uniformly mixing the pulverized lithium-rich oxide and the carbon source, under the condition of inert gas, at a second preset heating rate The temperature is raised to the second sintering temperature for sintering.
- the sintering furnace can be a conventional choice in the field, and preferably, the sintering furnace is a box furnace.
- the second preset heating rate is 1-10°C/min; specifically, for example, it can be 1°C/min, 2°C/min, 3°C/min, 4°C /min, 5°C/min, 6°C/min, 7°C/min, 8°C/min, 9°C/min or 10°C/min; preferably, the second preset heating rate is 5°C/min.
- the second sintering temperature is 200-600°C; specifically, for example, it can be 200°C, 300°C, 400°C, 500°C, 600°C and any two of these values. Any value in the constituted range; preferably, the second sintering temperature is 450°C.
- the second sintering time is 2-20h; specifically, for example, it can be 2h, 5h, 8h, 10h, 13h, 15h, 17h, 20h and any two of these values. Any value in the constituted range; preferably, the second sintering time is 4-10h.
- Another aspect of the present invention provides a carbon-coated lithium-rich oxide composite material prepared by the aforementioned method, the carbon-coated lithium-rich oxide composite material comprising a carbon layer and a lithium-rich oxide composite material coated by the carbon layer wherein, the lithium-rich oxide is Li 5 FeO 4 or Li 6 CoO 4 with an anti-fluorite structure.
- the carbon-coated lithium-rich oxide composite material can be used as an additive to provide irreversible lithium consumed during the first charge-discharge process of the cathode material.
- Examples 1-3 of the present invention are used to illustrate the preparation process of carbon-coated Li 5 FeO 4 composite materials, and Examples 4-6 are used to illustrate the preparation process of carbon-coated Li 6 CoO 4 composite materials.
- the Li 5 FeO 4 material was prepared according to the method described in Example 1, except that the pulverized Li 5 FeO 4 was not coated with carbon.
- the Li 6 CoO 4 material was prepared according to the method described in Example 4, except that the pulverized Li 6 CoO 4 was not coated with carbon.
- the materials prepared in Examples 1-6 and Comparative Examples 1-2 were prepared into lithium ion batteries and detected.
- the detection steps are as follows: carbon-coated Li 5 FeO 4 , Super-P and PVDF are in a mass ratio of 90:5: 5.
- Disperse in NMP control the solid content to be about 40%, after uniformly dispersing by defoamer, coat on aluminum foil, vacuum dry, make positive pole pieces, and then carry out button-type 2025 battery assembly in glove box, electrolysis
- the assembled half-cell was tested for capacity on the Xinwei tester.
- the charge cut-off voltage was 4.7V
- the discharge cut-off voltage was 2.0V
- the charge-discharge rate was 0.05C.
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Abstract
Description
Claims (10)
- 一种制备碳包覆富锂氧化物复合材料的方法,其特征在于,该方法包括以下步骤:(1)将铁源或钴源与锂源混合,烧结后得到富锂氧化物Li 5FeO 4或Li 6CoO 4,其中,所述锂源与所述铁源的摩尔比为5-25:1,所述锂源与所述钴源的摩尔比为6-30:1;(2)将步骤(1)中得到的富锂氧化物粉碎;(3)将步骤(2)中粉碎后的富锂氧化物与碳源混合,烧结后得到碳包覆富锂氧化物复合材料。
- 根据权利要求1所述的方法,其特征在于,在步骤(1)中,所述铁源为三氧化二铁、四氧化三铁、羟基氧化铁、硝酸铁和柠檬酸铁中的一种或多种。
- 根据权利要求1所述的方法,其特征在于,在步骤(1)中,所述钴源为氧化亚钴,四氧化三钴,碳酸钴,硫酸钴,氯化钴和硝酸钴中的一种或多种。
- 根据权利要求1所述的方法,其特征在于,在步骤(1)中,所述锂源为碳酸锂、单水氢氧化锂、无水氢氧化锂和氧化锂中的一种或多种。
- 根据权利要求1所述的方法,其特征在于,在步骤(1)中,所述烧结过程包括:将铁源或钴源与锂源的混合物置于烧结炉中,在惰性气体条件下,以第一预设升温速度升温至第一烧结温度进行烧结;优选地,所述第一预设升温速度为1-10℃/min;优选地,所述第一烧结温度为500-1000℃;所述第一烧结时间为3-60h。
- 根据权利要求1所述的方法,其特征在于,在步骤(2)中,将所述富锂氧化物粉碎至平均粒径为2-50μm。
- 根据权利要求1所述的方法,其特征在于,在步骤(3)中,所述碳源为导电炭黑、科琴黑、碳纳米管、乙炔黑、气相生长碳纤维、石墨烯和生物质碳中的一种或多种。
- 根据权利要求1所述的方法,其特征在于,在步骤(3)中,以富锂氧化物与碳源的总重量为基准,所述碳源所占的比例为0.5-10重量%。
- 根据权利要求1所述的方法,其特征在于,在步骤(3)中,所述烧结过程包括:将粉碎后的富锂氧化物与碳源混合均匀后,在惰性气体条件下,以第二预设升温速度升温至第二烧结温度进行烧结;优选地,所述第二预设升温速度为1-10℃/min;优选地,所述第二烧结温度为200-600℃;所述第二烧结时间为2-20h。
- 权利要求1-9中任意一项所述的方法制备的碳包覆富锂氧化物复合材料,其特征在于,该碳包覆富锂氧化物复合材料包括碳层和被碳层包覆的富锂氧化物,其中,所述富锂氧化物为Li 5FeO 4或Li 6CoO 4。
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20944429.8A EP4057390A4 (en) | 2020-07-09 | 2020-07-24 | CARBON-COATED LITHIUM-RICH OXIDE COMPOSITE MATERIAL AND PREPARATION METHOD THEREOF |
| JP2022560410A JP7436765B2 (ja) | 2020-07-09 | 2020-07-24 | 炭素被覆リチウムリッチ酸化物複合材料及びその製造方法 |
| KR1020227019401A KR102791458B1 (ko) | 2020-07-09 | 2020-07-24 | 탄소 코팅된 리튬-풍부 산화물 복합재료 및 이의 제조방법 |
| US17/783,654 US12406979B2 (en) | 2020-07-09 | 2020-07-24 | Carbon-coated lithium-rich oxide composite material and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010657297.4A CN111725576B (zh) | 2020-07-09 | 2020-07-09 | 一种碳包覆富锂氧化物复合材料及其制备方法 |
| CN202010657297.4 | 2020-07-09 |
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| WO2022007021A1 true WO2022007021A1 (zh) | 2022-01-13 |
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|---|---|
| US (1) | US12406979B2 (zh) |
| EP (1) | EP4057390A4 (zh) |
| JP (1) | JP7436765B2 (zh) |
| KR (1) | KR102791458B1 (zh) |
| CN (1) | CN111725576B (zh) |
| WO (1) | WO2022007021A1 (zh) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114702078A (zh) * | 2022-03-21 | 2022-07-05 | 湖北亿纬动力有限公司 | 一种碳包覆铁酸锂材料及其制备方法 |
| CN115000536A (zh) * | 2022-06-02 | 2022-09-02 | 深圳市德方创域新能源科技有限公司 | 正极补锂材料及其制备方法与应用 |
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| CN114702078A (zh) * | 2022-03-21 | 2022-07-05 | 湖北亿纬动力有限公司 | 一种碳包覆铁酸锂材料及其制备方法 |
| CN114702078B (zh) * | 2022-03-21 | 2023-06-20 | 湖北亿纬动力有限公司 | 一种碳包覆铁酸锂材料及其制备方法 |
| CN115000536A (zh) * | 2022-06-02 | 2022-09-02 | 深圳市德方创域新能源科技有限公司 | 正极补锂材料及其制备方法与应用 |
| CN115000536B (zh) * | 2022-06-02 | 2023-03-24 | 深圳市德方创域新能源科技有限公司 | 正极补锂材料及其制备方法与应用 |
| FR3137504A1 (fr) * | 2022-06-30 | 2024-01-05 | Guangdong Brunp Recycling Technology Co., Ltd. | Procédé de préparation de matériau actif d’électrode positive et son utilisation |
| WO2024016446A1 (zh) * | 2022-07-20 | 2024-01-25 | 广东邦普循环科技有限公司 | 一种核壳结构富锂氧化物及制备方法和应用 |
| FR3138248A1 (fr) * | 2022-07-20 | 2024-01-26 | Guangdong Brunp Recycling Technology Co., Ltd. | Oxyde riche en lithium à structure noyau-enveloppe et son procédé de préparation et son application |
| CN115799674A (zh) * | 2022-11-29 | 2023-03-14 | 楚能新能源股份有限公司 | 正极补锂材料及其制备方法和锂离子电池 |
| CN119381424A (zh) * | 2024-09-26 | 2025-01-28 | 合肥国轩高科动力能源有限公司 | 一种富锂铁酸锂复合材料及其制备方法 |
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| Publication number | Publication date |
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| CN111725576A (zh) | 2020-09-29 |
| KR102791458B1 (ko) | 2025-04-08 |
| JP2023505390A (ja) | 2023-02-08 |
| EP4057390A1 (en) | 2022-09-14 |
| US20230121840A1 (en) | 2023-04-20 |
| EP4057390A4 (en) | 2024-10-30 |
| KR20220118412A (ko) | 2022-08-25 |
| US12406979B2 (en) | 2025-09-02 |
| CN111725576B (zh) | 2024-04-09 |
| JP7436765B2 (ja) | 2024-02-22 |
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