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Surface coating modified lithium ion battery positive electrode material as well as preparation method and application thereof

A technology for lithium ion batteries and positive electrode materials, which is applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve problems such as limited ionic and electronic conductance, no electrochemical activity of coating materials, and limited comprehensive performance of materials. , to achieve the effect of inhibiting the occurrence of side reactions at the interface, improving the ion transport capacity, and simplifying the material synthesis process.

Active Publication Date: 2022-01-11
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of electrochemical activity of the cladding layer material and the limited ion and electronic conductance, it is still unable to maximize the best performance of the electrode material, which limits the improvement of the overall performance of the material.

Method used

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  • Surface coating modified lithium ion battery positive electrode material as well as preparation method and application thereof
  • Surface coating modified lithium ion battery positive electrode material as well as preparation method and application thereof
  • Surface coating modified lithium ion battery positive electrode material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] This Example 1 provides a surface-coated modified lithium ion battery positive electrode material, specifically a surface-coated modified lithium cobaltate positive electrode material. This example is used to illustrate its synthesis method and application.

[0044] Combine 2kg of original lithium cobaltate powder with 20g of high-entropy cationic disordered oxide Li(Mn 0.2 Ni 0.2 Fe 0.2 Ti 0.2 Nb 0.2 )O 2 Put the powder into a ball mill for mechanical ball milling and mixing, the ball milling speed is 300rpm / min, the mass ratio of material to ball milling beads is 1:10, and the ball milling time is 2 hours. The obtained mixed powder was transferred to a tube furnace and sintered at 700° C. for 4 hours to obtain a surface-coated modified lithium cobalt oxide positive electrode material.

[0045] figure 2 Li(Mn 0.2 Ni 0.2 Fe 0.2 Ti 0.2 Nb 0.2 )O 2 According to the powder X-ray diffraction (XRD) spectrum, it is analyzed that it is a cationic disordered rock s...

Embodiment 2

[0053] Prepare the positive electrode material with surface coating modification according to the same method as Example 1, the difference is that this example uses Li(Co 0.2 Ni 0.2 mn 0.2 Fe 0.2 Nb 0.2 )O 2 Used as a surface coating material for positive electrode materials.

Embodiment 3

[0055] Prepare the positive electrode material with surface coating modification according to the same method as Example 1, the difference is that this example uses Li(Ni 7 / 15 mn 3 / 15 Nb 1 / 15 Ti 2 / 15 Mo 2 / 15 )O 2 Used as a surface coating material for positive electrode materials.

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Abstract

The invention discloses a surface coating modified lithium ion battery positive electrode material and a lithium battery. The surface-coated modified lithium ion battery positive electrode material specifically comprises a positive electrode material body, a high-entropy cation disordered oxide coating layer coating the surface of the positive electrode material body, and an ion doping layer existing near the surface of the positive electrode material body; and the positive electrode material body, the ion doping layer and the high-entropy cation disordered oxide coating layer jointly form a multi-stage core-shell coating structure, wherein the near surface of the positive electrode material body is specifically a distance from the material surface of the positive electrode material body to the inside in a range of 0-100nm.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a surface-coated and modified lithium-ion battery cathode material, a preparation method and application thereof. Background technique [0002] The rapid development of consumer electronics, electric vehicles, smart grids and other fields has put forward higher requirements on the performance of rechargeable batteries. Among various rechargeable battery technology solutions, lithium-ion batteries have become the most important development direction in the secondary battery market due to their excellent electrochemical performance. With the continuous expansion of application fields, how to further improve the energy density of lithium-ion batteries has become the focus of battery research and development. [0003] Increasing the operating voltage of lithium-ion batteries is the most direct and effective way to increase their energy density. However, at high voltag...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/485H01M4/366H01M10/0525H01M2004/028Y02E60/10
Inventor 杨陆峰张杰男禹习谦李泓
Owner INST OF PHYSICS - CHINESE ACAD OF SCI