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Composite lithium-rich positive electrode material as well as preparation method and application thereof

A technology for lithium-rich cathode materials and raw materials, which is applied in the field of composite lithium-rich cathode materials and their preparation, can solve the problems of not considering the influence of water-ethanol mixed solvent cycle performance, structural phase transition, and complicated process.

Inactive Publication Date: 2021-06-08
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many defects in LLOs: 1) irreversible structural rearrangement occurs during the first charging process, resulting in a large amount of capacity loss; 2) structural phase transitions and surface side reactions increase during cycling, resulting in serious capacity fading; 3) the intrinsic electronic properties of the material Low electrical conductivity and ionic conductivity, resulting in poor rate performance
The process of this method is cumbersome and does not take into account the influence of water-ethanol mixed solvent on the cycle performance of the material

Method used

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  • Composite lithium-rich positive electrode material as well as preparation method and application thereof
  • Composite lithium-rich positive electrode material as well as preparation method and application thereof
  • Composite lithium-rich positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0052] The preparation method comprises the following steps:

[0053] The lithium-rich positive electrode material, the organic carbon source and water are mixed and then dried and calcined in sequence to obtain a composite lithium-rich positive electrode material coated with a carbon layer on the surface.

Embodiment 1

[0056] This embodiment provides a composite lithium-rich positive electrode material and a preparation method thereof. The raw material of the composite lithium-rich positive electrode material includes a lithium-rich positive electrode material and an organic carbon source; the organic carbon source is coated in the form of a carbon layer on the The surface of the lithium-rich cathode material;

[0057] The lithium-rich cathode material is 0.4Li 2 MnO 3 0.6LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 ;

[0058] The organic carbon source is polyvinylpyrrolidone.

[0059] The preparation method comprises the following steps:

[0060] 95wt% of 0.4Li 2 MnO 3 0.6LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 Mix it with 5wt% polyvinylpyrrolidone and water, stir continuously in a water bath at 40°C until the water is completely evaporated, and then bake it in an air atmosphere at 300°C for 0.5h to obtain a composite lithium-rich compound with a carbon layer on the surface. Cathode material.

Embodiment 2

[0062] This embodiment provides a composite lithium-rich cathode material and a preparation method thereof, the composite lithium-rich cathode material refers to the composite lithium-rich cathode material in Example 1;

[0063] The preparation method comprises the following steps:

[0064] 90wt% of 0.4Li 2 MnO 3 0.6LiNi 1 / 3 mn 1 / 3 co 1 / 3 o 2 Mix it with 10wt% polyvinylpyrrolidone and water, stir continuously in a water bath at 50°C until the water is completely evaporated, and then bake it in an air atmosphere at 350°C for 0.8h to obtain a composite lithium-rich compound with a carbon layer on the surface. Cathode material.

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Abstract

The invention provides a composite lithium-rich positive electrode material as well as a preparation method and application thereof. The composite lithium-rich positive electrode material is prepared from a lithium-rich positive electrode material and an organic carbon source, wherein the organic carbon source coats the surface of the lithium-rich positive electrode material in the form of a carbon layer; the lithium-rich positive electrode material comprises xLi<2>MnO<3>. (1-x)LiMO<2>, x is greater than 0 and smaller than 1, and m is any one or a combination of at least two selected from the group consisting of Ni, Co and Mn; and the organic carbon source comprises polyvinylpyrrolidone. According to the preparation method disclosed by the invention, the composite lithium-rich positive electrode material is prepared by adopting a liquid phase coating method, so the cycle performance of a lithium ion battery is improved, and initial coulombic efficiency and rate capability are obviously improved; and the preparation method is simple to operate, friendly to environment, low in energy consumption and raw material cost, beneficial to industrial large-scale production and relatively good in industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery positive electrode materials, and in particular relates to a composite lithium-rich positive electrode material and its preparation method and application. Background technique [0002] In recent years, lithium-rich cathode materials (LLOs) have been favored due to their high reversible capacity (>250mAh g -1 ), high energy density (>1000Wh kg -1 ), friendly to the environment and low in cost, triggering a research boom. However, there are still many defects in LLOs: 1) irreversible structural rearrangement occurs during the first charging process, resulting in a large amount of capacity loss; 2) structural phase transitions and surface side reactions increase during cycling, resulting in serious capacity fading; 3) the intrinsic electronic properties of the material The electrical conductivity and ionic conductivity are low, making the rate capability poor. Therefore, how to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C01B32/05C01G45/12C01G53/00
CPCC01G45/1257C01G53/50C01P2002/72C01P2002/82C01P2004/03C01P2006/40C01B32/05H01M4/366H01M4/505H01M4/525H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 曹晶晶陈婷婷徐海波宋鹏元何巍
Owner HUBEI JINQUAN NEW MATERIALS CO LTD