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Method for reducing content of residual alkali on surface of positive electrode material and application thereof

A cathode material, surface residue technology, applied in chemical instruments and methods, battery electrodes, nickel compounds, etc., can solve the problems of lithium-ion battery gas production, shortened cycle shelf life, and potential safety hazards, and achieves improved electrochemical performance. performance, improving the capacity fade problem, solving the effect of the hazard

Pending Publication Date: 2020-07-28
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the greatly increased residual alkaline impurities on the surface of high-nickel cathode materials will lead to serious gas production problems in lithium-ion batteries during charging and discharging, resulting in battery expansion and deformation, shortened cycle shelf life, and potential safety hazards.

Method used

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  • Method for reducing content of residual alkali on surface of positive electrode material and application thereof
  • Method for reducing content of residual alkali on surface of positive electrode material and application thereof
  • Method for reducing content of residual alkali on surface of positive electrode material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Weigh 1mol of Ni 0.835 co 0.1074 mn 0.0575 (OH) 2 and 1.02mol of LiOH·H 2 O was placed in a mortar, thoroughly ground and mixed evenly, then placed in a box-type atmosphere furnace at 740°C and oxygen atmosphere for high-temperature sintering for 10 hours, and the material was taken out for ultra-centrifugal grinding and sieving to obtain the positive electrode matrix material; weigh 1mol positive electrode matrix material, 0.01mol Mn(CH 3 COO) 2 , 0.02mol LiOH·H 2 O, placed in a mortar for thorough grinding and mixing, and then placed in a box-type atmosphere furnace for high-temperature sintering at 700°C and oxygen atmosphere for 6h to obtain the final desired positive electrode material.

Embodiment 2

[0059] Weigh 1mol of Ni 0.835 co 0.1074 mn 0.0575 (OH) 2 and 1.02mol of LiOH·H 2 O was placed in a mortar, thoroughly ground and mixed evenly, then placed in a box-type atmosphere furnace at 740°C and oxygen atmosphere for high-temperature sintering for 10 hours, and the material was taken out for ultra-centrifugal grinding and sieving to obtain the positive electrode matrix material; weigh 1mol positive electrode matrix material, 0.03mol Mn(CH 3 COO) 2 , 0.06mol LiOH·H 2 O, placed in a mortar for thorough grinding and mixing, and then placed in a box-type atmosphere furnace for high-temperature sintering at 700°C and oxygen atmosphere for 6h to obtain the final desired positive electrode material.

Embodiment 3

[0061] Weigh 1mol of Ni 0.835 co 0.1074 mn 0.0575 (OH) 2 and 1.02mol of LiOH·H 2 O was placed in a mortar, thoroughly ground and mixed evenly, and then placed in a box-type atmosphere furnace at 740 ° C and oxygen atmosphere for high-temperature sintering for 10 h, and the material was taken out for ultra-centrifugal grinding and sieving; weighed 1 mol of positive electrode material, 0.03 mol Mn(CH 3 COO) 2 , 0.0598molLiOH·H 2 O, placed in a mortar for thorough grinding and mixing, and then placed in a box-type atmosphere furnace for high-temperature sintering at 700°C and oxygen atmosphere for 6h to obtain the final desired positive electrode material.

[0062] Under the same conditions, the positive electrode materials obtained in Examples 1-3 and Comparative Examples 1-2 were evaluated respectively

[0063] 1. The positive electrode materials obtained in Examples 1-3 and Comparative Examples 1-2 are tested for surface residual alkali content

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Abstract

The invention discloses a method for reducing the content of residual alkali on the surface of a positive electrode material and application thereof. The method for reducing the content of residual alkali on the surface of the positive electrode material comprises the following steps: mixing a nickel-cobalt-manganese ternary positive base material having alkali residues on the surface with a coating agent, and carrying out roasting treatment so as to allow residual alkali on the surface of the positive base material to react with the coating agent to form a coating layer on the surface of thepositive base material, thereby obtaining the positive electrode material with low content of alkali residues on the surface. The method not only can effectively solve the problem of harm of conventional residual alkali removing methods to the performance and the environment of positive electrode materials, but also can improve the electrochemical performance and the safety performance of a lithium ion battery and prolong the service life of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a method for reducing the residual alkali content on the surface of positive electrode materials and an application thereof. Background technique [0002] At present, the ternary cathode materials NCM111, NCM523, and NCM622 for lithium-ion batteries have been mass-produced and used, but the cathode materials used in the current mainstream battery technology still cannot fully meet the requirements of high energy density and long cruising range. The problem is that researchers have been trying to develop high-energy-density lithium-ion battery cathode materials, such as NCM811, etc., but as the nickel content of the cathode material increases, the Li / Ni mixing phenomenon intensifies. In order to form a layered structure well, an excess lithium source needs to be put into the synthesis process, and Li 2 Unreacted lithium oxide in the O state, this unreacted lithium oxi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCC01G53/006H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525C01P2004/03C01P2006/40Y02E60/10
Inventor 李红朝朱金鑫王鹏飞拉杰什·麦加苏强普拉杰什·PP马加力
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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