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Cathode coating method for sulfide solid-state lithium ion battery, cathode and battery

A lithium-ion battery, sulfide technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of poor battery cycle and rate performance, and achieve good charge-discharge performance, good stability, and good Effects of Electrochemical Stability and Deformability

Active Publication Date: 2020-10-16
湖南恩捷前沿新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a positive electrode material coating method, positive electrode and battery applied to sulfide all-solid lithium ion batteries, aiming to solve the problem of the existing sulfide solid lithium ion batteries due to the interface between the positive electrode material and the sulfide solid electrolyte. Issues leading to poor battery cycling and rate performance

Method used

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  • Cathode coating method for sulfide solid-state lithium ion battery, cathode and battery
  • Cathode coating method for sulfide solid-state lithium ion battery, cathode and battery
  • Cathode coating method for sulfide solid-state lithium ion battery, cathode and battery

Examples

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Embodiment 1

[0026] Example 1: Please refer to figure 1 , in an environment with a water content of 0.1ppm, weigh an appropriate amount of YCl according to the relationship of a molar mass ratio of 1:3 3 and LiCl, which are fully dissolved in absolute ethanol to obtain Li 3 YCl 6 ethanol solution; Weigh an appropriate amount of LiCoO 2 The material was dried in an oven at 60°C for 3h and then irradiated under a UV lamp for 1h; the temperature was set at 90°C, and the Li 3 YCl 6 ethanol solution sprayed on LiCoO after UV irradiation 2 On the material, it will be coated with Li after spraying 3 YCl 6 LiCoO 2 The material was heated up to 300°C at a rate of 5°C / min under a protective atmosphere of argon, then kept for 2 hours and then annealed to obtain Li 3 YCl 6 Coating stable LiCoO 2 Material. For coated LiCoO 2 The material was observed by SEM, and the results were as follows: figure 2 As shown, the SEM characterization shows that the LiCoO 2 Uniform distribution of Li can ...

Embodiment 2

[0027] Example 2: In an environment with a water content of 0.1ppm, weigh an appropriate amount of YCl according to a molar mass ratio of 1:3 3 and LiCl, which are fully dissolved in absolute ethanol to obtain Li 3 YCl 6 ethanol solution; Weigh an appropriate amount of NCM622 single crystal material, dry it in an oven at 80°C for 2h, and then shine it under a UV lamp for 2h; set the temperature at 90°C, and spray Li 3 YCl 6The ethanol solution is sprayed on the NCM622 single crystal material after ultraviolet irradiation, and the Li 3 YCl 6 The NCM622 material was heated to 260°C at a rate of 2°C / min under an argon protective atmosphere, then kept for 2 hours and annealed to obtain Li 3 YCl 6 Coated with stable NCM622 material. Weigh an appropriate amount of coated NCM622 material, Li 6 P.S. 5 Cl and porous carbon, and mix the three substances thoroughly. The mixed positive electrode material, Li 6 P.S. 5 Cl and 50um indium flakes were pressed at 340Mpa for 3min and...

Embodiment 3

[0028] Example 3: In an environment with a water content of 0.1ppm, weigh an appropriate amount of YCl according to a molar mass ratio of 1:3 3 and LiCl, which are fully dissolved in absolute ethanol to obtain Li 3 YCl 6 ethanol solution; Weigh an appropriate amount of LiCoO 2 The material was dried in an oven at 60°C for 3h and then irradiated under a UV lamp for 1h; the temperature was set at 90°C, and the Li 3 YCl 6 ethanol solution sprayed on LiCoO after UV irradiation 2 On the material, it will be coated with Li after spraying 3 YCl 6 LiCoO 2 The material was heated to 300°C at a rate of 3°C / min under a protective atmosphere of argon, then kept for 2 hours and then annealed to obtain Li 3 YCl 6 Coating stable LiCoO 2 Material. Weigh an appropriate amount of coated LiCoO according to the mass ratio of 70:27:3 2 Material, Li 6 P.S. 5 Br and porous carbon, and mix the three substances thoroughly. The mixed positive electrode material, Li 6 P.S. 5 Br and 50um ...

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Abstract

The invention discloses a cathode coating method for a sulfide solid-state lithium ion battery, a cathode and a battery. Specifically, iridium halide and lithium halide are used as raw materials, twofully mixed ethanol solutions are sprayed on the surface of the cathode material in a spraying mode, and the cathode material coated with the Li3YX6 layer is obtained after sintering and annealing under the protection of inert gas atmosphere, the coated cathode material, conductive carbon and sulfide solid electrolyte are fully mixed according to a certain ratio for assembling the sulfide all-solid-state lithium ion battery. The cathode coating layer prepared by adopting the method can effectively inhibit the side reaction between the sulfide electrolyte and the cathode material, so that the cathode can be effectively protected, the stability of the cathode material is improved, and the coating material has relatively high ionic conductivity, so that the cycle performance of the all-solid-state battery is improved, and the all-solid-state battery can be ensured to have relatively good charging and discharging performance under high voltage.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries. Specifically, the invention relates to a method for coating a positive electrode material applied to a sulfide all-solid lithium ion battery, a positive electrode and a battery. Background technique [0002] Energy has always been one of the indispensable factors to promote social progress. With the development of society, human demand for coal, oil and natural gas is increasing. At the same time, it is accompanied by problems such as energy crisis and environmental pollution. Therefore, the development of green environmental protection A new type of energy that is safe, non-polluting, and sustainable is an important goal of mankind. Lithium-ion batteries with high energy density, light weight, long cycle life, and environmental friendliness show broad application prospects and potential huge economic benefits. [0003] At present, lithium-ion batteries are mainly based on organic e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/13H01M4/131H01M4/36H01M10/0525H01M10/0562
CPCH01M4/366H01M4/628H01M4/13H01M4/131H01M10/0525H01M10/0562H01M2300/0068H01M2300/008Y02E60/10
Inventor 刘芳洋孙振景圣皓蒋良兴贾明
Owner 湖南恩捷前沿新材料科技有限公司
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