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Lithium ion battery positive pole material, preparation method thereof, lithium ion battery positive pole and all-solid-state lithium battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of interface element diffusion and limited interface performance improvement

Inactive Publication Date: 2020-01-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present disclosure is to solve the limited improvement of the interface performance of the existing oxide-coated cathode materials, and to provide a cathode material for lithium-ion batteries, which has a stable surface and less diffusion of interface elements

Method used

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  • Lithium ion battery positive pole material, preparation method thereof, lithium ion battery positive pole and all-solid-state lithium battery
  • Lithium ion battery positive pole material, preparation method thereof, lithium ion battery positive pole and all-solid-state lithium battery
  • Lithium ion battery positive pole material, preparation method thereof, lithium ion battery positive pole and all-solid-state lithium battery

Examples

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Embodiment 1

[0062] This embodiment is used to illustrate the lithium-ion battery cathode material and all-solid-state lithium battery of the present disclosure, as well as their preparation methods.

[0063] (1) Preparation of positive electrode C

[0064] First, a positive electrode material with a core-shell structure with a fluorinated inner shell and an oxyfluoride outer shell is prepared, and the positive active material as the core material is LiCoO 2 material, the specific preparation method is, 1000gLiCoO 2 with 30gFeF 3 Put it into a semi-closed reaction vessel with a volume of 5L, add 100mL of deionized water, 100mL of diluted HF solution (anhydrous HF: deionized water = 11.1mL: 88.9mL) and 800mL of ethanol, start stirring, seal and heat to 170°C for reaction until the pressure in the reaction vessel reaches 8×10 6 After Pa (that is, 80 atmospheres), open the pressure reducing valve to ensure that the pressure in the container is 8×10 6 Pa, until the reaction is completed, t...

Embodiment 2

[0073] The same steps as in Example 1 were used to prepare the coated positive electrode material and lithium ion battery of this example, the difference being that:

[0074] In step (1), FeF 3 The dosage is not 30g, but 60g. The 100mL diluted HF solution used has an anhydrous HF: deionized water ratio of 22.2mL: 77.85L. Other steps and operations are the same.

Embodiment 3

[0076] The same steps as in Example 1 were used to prepare the coated positive electrode material and lithium ion battery of this example, the difference being that:

[0077] In step (1), the simultaneous fluorination and TiOF 2 Coated LiCoO 2 Positive electrode material, its preparation method is, with 1000gLiCoO 2 with 30gTiF 4 Put it into a semi-closed reaction vessel with a volume of 5L, add 100mL of deionized water, 100mL of diluted HF solution (anhydrous HF: deionized water = 11.1mL: 88.9mL) and 800mL of ethanol, start stirring, seal and heat to 200°C for reaction until the pressure in the reaction vessel reaches 1×10 7 After Pa (that is, 100 atmospheres), open the pressure reducing valve to ensure that the pressure in the container is 1×10 7 Pa, until the reaction is complete, the simultaneous fluorination and TiOF 2 Coated LiCoO 2 positive electrode material, and then directly use the positive electrode material to assemble a solid-state lithium battery, and the ...

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Abstract

The invention relates to a lithium ion battery positive pole material, a preparation method thereof, a lithium ion battery positive pole and an all-solid-state lithium battery. The positive pole material comprises a core-shell structure composite material; the core-shell structure composite material comprises a core material, an inner shell material and an outer shell material; the core material comprises a positive pole active substance; the inner shell material is a positive pole active substance containing fluorine; and the outer shell material contains oxyfluoride. According to the lithiumion battery positive pole material disclosed by the invention, a fluorinated layer is adopted as an inner shell, the oxyfluoride is adopted as an outer shell; and since the formed core-shell structure is coated with the two shells, a coating structure is stable, and therefore, interface reaction or element diffusion between the positive pole material and a solid electrolyte can be avoided, and atthe same time, element diffusion between the positive pole material and the coating is reduced, and therefore, the interface of the positive pole material can be greatly optimized. With the method for preparing the positive pole material disclosed by the invention adopted, coating and fluorination can be completed in one step; coating temperature is low; operation is simple and feasible; elementinterpenetration is reduced; and the interface of the positive pole material is optimized.

Description

technical field [0001] The present disclosure relates to the field of all-solid-state lithium batteries, in particular, to a lithium-ion battery cathode material and a preparation method thereof, a lithium-ion battery cathode and an all-solid-state lithium battery. Background technique [0002] The interface between the positive electrode material and the solid electrolyte of an all-solid-state lithium battery is prone to element diffusion, resulting in a decrease in battery performance. Most of the existing technologies are to coat the positive electrode material, so as to improve the interface between the positive electrode and the solid electrolyte. The commonly used coating materials are Li 4 Ti 5 o 12 、Al 2 o 3 , LiNbO 3 Wait. However, the performance improvement brought by a single coating to the cathode material is limited, and it cannot solve the problem of interfacial diffusion between the cathode material and the coating. Contents of the invention [0003]...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M4/131H01M4/136H01M10/0525
CPCH01M4/131H01M4/136H01M4/366H01M4/628H01M10/0525H01M4/36H01M4/62Y02E60/10
Inventor 历彪郭姿珠马永军谢静
Owner BYD CO LTD
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