Coated ternary material and application thereof

A ternary material and coating technology, applied in nanotechnology, electrical components, nanotechnology, etc. for materials and surface science, can solve the problems of DCR growth, thermodynamic instability, battery electrochemical performance degradation, etc., to achieve Good ionic conductivity and electronic conductivity, improved cycle stability and rate performance, and improved lattice compatibility

Pending Publication Date: 2022-08-05
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the working voltage of commercial ternary material batteries is about 4.2-4.35V, and the utilization rate of reversible lithium is not enough. In order to further improve the volume energy density of ternary batteries, it is necessary to increase the charging voltage
However, when the charging voltage exceeds 4.4 V, the electrochemical performance of the battery will drop sharply due to the thermodynamic instability of the layered structure in the highly delithiated state, and the degradation of the cathode/electrolyte interface due to surface side reactions, It shows that th

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  • Coated ternary material and application thereof
  • Coated ternary material and application thereof
  • Coated ternary material and application thereof

Examples

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Example Embodiment

[0041] Example 1

[0042] This embodiment provides a coated ternary material, and the core composition of the coated ternary material is LiNi 0.58 Co 0.11 Mn 0.31 O 2, the cladding layer is WAO material, and the WAO material is tungsten oxide-doped alumina;

[0043] Based on the mass of the clad ternary material, the mass percentage of the WAO material is 0.54 wt %, the content of the Al element is 1000 ppm, and the content of the W element is 2800 ppm;

[0044] In the WAO material, the mass ratio of Al element and W element is 1:3;

[0045] The preparation raw materials of the coated ternary material include ternary material a sintered product, WAO material and ethanol;

[0046] The preparation method of the coated ternary material comprises the following steps:

[0047] Mix the first sintered ternary material, WAO material and ethanol, stir to completely volatilize the ethanol, and then sinter the obtained mixture at 450 °C for 15 h to obtain the coated ternary materia...

Example Embodiment

[0049] Example 2

[0050] This embodiment provides a coated ternary material, and the core composition of the coated ternary material includes LiNi 0.6 Co 0.12 Mn 0.28 O 2 , the cladding layer is WAO material, and the WAO material is tungsten oxide-doped alumina;

[0051] Based on the mass of the cladding ternary material, the mass percentage of the WAO material is 0.3 wt %, the content of the Al element is 700 ppm, and the content of the W element is 1400 ppm;

[0052] In the WAO material, the mass ratio of Al element and W element is 1:2;

[0053] The preparation raw materials of the coated ternary material include ternary material a sintered product, WAO material and ethanol;

[0054] The preparation method of the coated ternary material comprises the following steps:

[0055] Mixing the first sintered product of ternary material, WAO material and ethanol, after stirring to completely volatilize the ethanol, the obtained mixture is sintered at 300°C for 18 hours to ob...

Example Embodiment

[0057] Example 3

[0058] This embodiment provides a coated ternary material, and the core composition of the coated ternary material includes LiNi 0.58 Co 0.11 Mn 0.31 O 2 , the cladding layer is WAO material, and the WAO material is tungsten oxide-doped alumina;

[0059] Based on the mass of the coated ternary material, the mass percentage of the WAO material is 0.7 wt %, the content of the Al element is 1000 ppm, and the content of the W element is 4000 ppm;

[0060] In the WAO material, the mass ratio of Al element and W element is 1:4;

[0061] The preparation raw materials of the coated ternary material include ternary material a sintered product, WAO material and ethanol;

[0062] The preparation method of the coated ternary material comprises the following steps:

[0063] Mixing the first sintered ternary material, WAO material and ethanol, stirring to completely volatilize the ethanol, and sintering the obtained mixture at 600°C for 10 hours to obtain the coated...

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Abstract

The invention provides a coated ternary material and application thereof, a coating layer of the coated ternary material comprises a WAO material, and the WAO material is tungsten oxide doped aluminum oxide. The WAO-doped aluminum oxide material is adopted as the coating layer of the ternary material, the problem of poor conductivity of the aluminum oxide coating layer is solved, the WAO coating layer has good ionic conductivity and electronic conductivity in combination with the dynamic advantage of W < 6 + >, the lattice compatibility of the coating layer and the ternary material is improved, and the conductivity of the ternary material is improved. And the cycling stability and the rate capability of the ternary material are effectively improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and relates to a ternary material, in particular to a coated ternary material and its application. Background technique [0002] At present, the working voltage of commercial ternary battery is about 4.2-4.35V, and the utilization rate of reversible lithium is not enough. In order to further improve the volume energy density of ternary battery, it is necessary to increase the charging voltage. However, when the charging voltage exceeds 4.4 V, the electrochemical performance of the battery will drop sharply due to the thermodynamic instability of the layered structure in the high delithiation state, and the degradation of the cathode / electrolyte interface due to surface side reactions, It is manifested as a serious increase in gas production, and a significant increase in DCR (direct current internal resistance) during the cycle. [0003] Coating the alumina coating on the surface of the ternar...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525B82Y40/00B82Y30/00H01M4/505H01M4/525
CPCH01M4/366H01M4/624B82Y40/00B82Y30/00H01M10/0525H01M4/505H01M4/525H01M2004/028Y02E60/10
Inventor 杨元婴莫方杰朱呈岭杨文龙孙化雨
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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