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Positive electrode material, preparation method thereof and lithium ion battery

A technology of positive electrode materials and single crystal materials, applied in the field of lithium ion batteries, positive electrode materials and their preparation, can solve problems such as electrochemical performance degradation, achieve good conductivity and stability, improve conductivity and structural stability, and have good Effects of normal temperature cycle and high temperature cycle performance

Active Publication Date: 2022-01-07
蜂巢能源科技(马鞍山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the accumulation of internal stress at high temperature and long cycle will lead to cracks, which will further induce more side reactions and seriously degrade its electrochemical performance.

Method used

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  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] This embodiment provides a positive electrode material, the positive electrode material is double-coated, and the structure diagram of the positive electrode material is shown in figure 1 , the positive electrode material includes a positive electrode material substrate 1, the surface of the positive electrode material substrate 1 is coated with a negative thermal expansion material layer 2, and the surface of the negative thermal expansion material layer 2 is coated with a tungsten-boron co-coating layer 3;

[0059] Among them, the positive electrode material matrix is ​​a cobalt-free layered positive electrode material LiNi 0.6 mn 0.4 o 2 , the negative thermal expansion material layer is ZrW 2 o 8 layer, the tungsten-boron co-coating layer includes tungsten oxide and boron oxide;

[0060] Preferably, based on 100% of the mass of the positive electrode material matrix, the mass content of the negative thermal expansion material layer is 0.3%.

[0061] This embodi...

Embodiment 2

[0066] This embodiment provides a positive electrode material, the positive electrode material includes a positive electrode material matrix, the surface of the positive electrode material matrix is ​​coated with a negative thermal expansion material layer, and the surface of the negative thermal expansion material layer is coated with a tungsten-boron co-coating layer ;

[0067] Among them, the positive electrode material matrix is ​​a cobalt-free layered positive electrode material LiNi 0.75 mn 0.25 o 2 , the negative thermal expansion material layer is ZrV 2 o 7 layer, the tungsten-boron co-coating layer includes WB;

[0068] Preferably, based on 100% of the mass of the positive electrode material matrix, the mass content of the negative thermal expansion material layer is 0.4%.

[0069] This embodiment also provides a method for preparing the above-mentioned positive electrode material, comprising the following steps:

[0070] Cobalt-free layered positive electrode m...

Embodiment 3

[0074] This embodiment provides a positive electrode material, the positive electrode material includes a positive electrode material matrix, the surface of the positive electrode material matrix is ​​coated with a negative thermal expansion material layer, and the surface of the negative thermal expansion material layer is coated with a tungsten-boron co-coating layer ;

[0075] Among them, the positive electrode material matrix is ​​a cobalt-free layered positive electrode material LiNi 0.8 mn 0.2 o 2 , the negative thermal expansion material layer is Sc 2 W 3 o 12 layer, the tungsten-boron co-coating layer includes WB;

[0076] Preferably, based on 100% of the mass of the positive electrode material matrix, the mass content of the negative thermal expansion material layer is 0.5%.

[0077] This embodiment also provides a method for preparing the above-mentioned positive electrode material, comprising the following steps:

[0078] Cobalt-free layered positive electrod...

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Abstract

The invention discloses a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material comprises a positive electrode material substrate, the surface of the positive electrode material substrate is coated with a negative thermal expansion material layer, and the surface of the negative thermal expansion material layer is coated with a tungsten-boron co-coating layer. The positive electrode material disclosed by the invention has good normal-temperature cycle performance and high-temperature cycle performance.

Description

technical field [0001] The invention relates to the technical field of batteries, and relates to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] The global energy problem is becoming more and more serious, and the environmental problem is also becoming more and more prominent. The development of new and efficient energy technologies and new energy materials has become an important way to solve social energy and environmental problems. The rapid development of electric vehicles and large-scale energy storage systems has put forward urgent requirements for lithium-ion battery electrode materials with high energy density, low cost, and high safety. [0003] Ternary materials and cobalt-free ternary materials have attracted much attention due to their advantages such as high energy density, especially high-nickel layered cathode materials with high energy density have broad application prospects. However, the...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/628H01M4/624H01M4/505H01M4/525H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 潘海龙李子郯杨红新
Owner 蜂巢能源科技(马鞍山)有限公司
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