Lithium-rich manganese-based positive electrode material, and preparation method and use thereof

A lithium-rich manganese-based, cathode material technology, applied in chemical instruments and methods, battery electrodes, nickel compounds, etc., can solve the problems of high preparation cost, low battery capacity, complex preparation process, etc., to improve energy density and energy. The effect of density, flexibility and flexibility

Active Publication Date: 2019-07-02
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN106207091A discloses a flexible positive electrode of a lithium ion battery, its preparation method and an ultra-flexible lithium ion full battery, which specifically includes the following steps: 1) selecting a flexible framework, and depositing a manganese oxyhydroxide material on the flexible framework by electroplating; 2) The electrodeposited manganese oxyhydroxide material is lithiated in a molten salt containing lithium ions at a low melting point to form a lithium ion battery anode material lithium manganate conformally grown on a flexible framework. The above-mentioned preparation process is complicated, High cost of preparation
[0006] CN103825007B discloses a kind of preparation method based on graphene-carbon nanotube composite structure to construct phosphate flexible lithium ion secondary battery cathode, although this method is simple and easy, but, used a lot of inert components that do not contribute to capacity, There is a mechanical mismatch between the "rigid" active material and the "flexible" conductive substrate, and the contact between the active material and the current collector must be insufficient.
[0007] Although the above-mentioned documents disclose some flexible positive electrode materials and their preparation methods, there is still a problem that the preparation process needs to add inert components that do not contribute to the capacity, resulting in low battery capacity. Therefore, the development of a preparation process is simple, and the positive electrode material Flexible cathode materials without inert components are still of great significance

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  • Lithium-rich manganese-based positive electrode material, and preparation method and use thereof

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Effect test

Embodiment 1

[0071] The molecular formula is Li 1.2 Mn 0.56 Ni 0.16 Co 0.08 O 2 The preparation method of the lithium-rich manganese-based cathode material includes the following steps:

[0072] (1') Prepare a mixed solution of nickel sulfate, manganese sulfate and cobalt sulfate with a total metal salt concentration of 2M, then add 2M sodium hydroxide solution, react at 55°C, add ammonia to adjust the pH of the reaction solution The manganese-based material was obtained by drying at 100°C for 12 hours; the molar ratio of nickel sulfate, manganese sulfate and cobalt sulfate was 0.2:0.7:0.1;

[0073] (2') Mix the manganese-based material obtained in step (1') with a lithium source, and perform two-step calcination, first calcining at 500°C for 6 hours, and then calcining at 850°C for 20 hours to obtain a lithium-rich manganese-based material intermediate; The lithium source is lithium carbonate, and its addition amount is 5 mol% more than its theoretical addition amount;

[0074] (3') Mix the lit...

Embodiment 2

[0077] The molecular formula is Li 1.2 Mn 0.64 Ni 0.08 Co 0.08 O 2 The preparation method of the lithium-rich manganese-based cathode material includes the following steps:

[0078] (1') Prepare a mixed solution of nickel chloride, manganese chloride and cobalt chloride with a total metal salt concentration of 2M, then add a sodium carbonate solution with a concentration of 1M, react at 55°C, and add ammonia to adjust the reaction solution The manganese-based material is obtained by drying at 100°C for 12 hours; the molar ratio of nickel chloride, manganese chloride and cobalt chloride is 0.1:0.8:0.1;

[0079] (2') Mix the manganese-based material obtained in step (1') with a lithium source, and perform two-step calcination, first calcining at 550°C for 6 hours, and then calcining at 950°C for 20 hours to obtain a lithium-rich manganese-based material intermediate; The lithium source is lithium carbonate, and its addition amount is 10 mol% more than its theoretical addition amount;...

Embodiment 3

[0083] The molecular formula is Li 1.2 Mn 0.32 Ni 0.32 Co 0.16 O 2 The preparation method of the lithium-rich manganese-based cathode material includes the following steps:

[0084] (1') Prepare a mixed solution of nickel nitrate, manganese nitrate and cobalt nitrate with a total metal salt concentration of 2M, then add a sodium carbonate solution with a concentration of 1M, react at 60℃, and add ammonia to adjust the pH of the reaction solution. 8. Drying at 100°C for 12 hours to obtain the manganese-based material; the molar ratio of nickel nitrate, manganese nitrate and cobalt nitrate is 0.4:0.4:0.2;

[0085] (2') Mix the manganese-based material obtained in step (1') with a lithium source, and perform two-step calcination, first calcining at 450°C for 6 hours, and then at 800°C for 20 hours to obtain a lithium-rich manganese-based material intermediate; The lithium source is LiOH, and its addition amount is 20 mol% more than its theoretical addition amount.

[0086] (3') Mix the...

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Abstract

The invention discloses a lithium-rich manganese-based positive electrode material, and a preparation method and a use thereof. The lithium-rich manganese-based positive electrode material is a flexible lithium-rich manganese-based positive electrode material, and does not contain other inert components, so the energy density is obviously improved. The preparation method of the lithium-rich manganese-based positive electrode material comprises the following steps: mixing a lithium source with a manganese-based material, carrying out stripping and centrifuging treatment to obtain a lithium-richmanganese-based positive electrode material suspension, coating a substrate with the suspension, and carrying out vacuum drying to obtain the lithium-rich manganese-based positive electrode material.The lithium-rich manganese-based positive electrode material regulates the thickness and the flexibility of the product film by controlling the coated weight and vacuum drying conditions.

Description

Technical field [0001] The invention relates to the field of electrode materials, in particular to a lithium-rich manganese-based positive electrode material and a preparation method and application thereof. Background technique [0002] In recent years, flexible electronic devices such as rollable LCD screens, wearable communication devices, smart glasses, bracelets, watches, flexible electronic strain sensors, and flexible electronic skins have become increasingly popular, which has brought tremendous changes to people’s daily lives and broadened them. In addition to the application scope of electronic devices, it touched the application fields (such as reel type, half-fold type, and stretch type electronic products) that the previous "hard state" electronic equipment could not reach, which attracted widespread attention and rapid development all over the world. It is conceivable that flexible electronic devices will, like current smart phones and mobile Internet, profoundly af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01P2006/40H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 谭强强冯海兰纪雪倩
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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