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A kind of ternary cathode material and preparation method thereof

A cathode material and treatment solution technology, which is applied in the field of preparation of ternary cathode materials, can solve the problems of failure to meet the use requirements of power batteries, the decline of the rate and cycle performance of ternary materials, and the increase of costs, and achieves further suppression of residual alkali. The effect of generating, reducing the amount of residual alkali on the surface, and reducing flatulence

Active Publication Date: 2021-10-08
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can thoroughly clean the residual alkali on the surface, but its disadvantages are also very obvious. After the treatment, the ternary material rate and cycle performance are significantly reduced and cannot meet the requirements of the power battery, and the process of washing and burning increased cost

Method used

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  • A kind of ternary cathode material and preparation method thereof
  • A kind of ternary cathode material and preparation method thereof
  • A kind of ternary cathode material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0034] This embodiment provides a method for preparing a ternary positive electrode material, which specifically includes the following steps:

[0035] The lithium-ion battery high-nickel ternary cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 placed in a confined space;

[0036] The citric acid aqueous solution of 0.5wt% zirconium nitrate is used to generate ultrafine particles by an ultrafine particle generator;

[0037] The ultrafine particles are transported to a closed space, and treated for 20 minutes under normal temperature and pressure conditions. The dried samples are placed in a muffle furnace with an oxygen atmosphere, and sintered at 500 ° C for 4 hours, and then naturally cooled to room temperature to obtain low residual alkali content of the ternary cathode material. The residual alkali content after treatment is 0.2wt% Li 2 CO 3 , 0.09 wt% LiOH. The residual alkali content of this material before treatment is 0.421wt% Li 2 CO 3 , 0.32 wt% LiOH.

[0038] ...

Embodiment 2

[0042] This embodiment provides a method for preparing a ternary positive electrode material. The high-nickel material used in this embodiment is LiNi 0.8 co 0.1 mn 0.1 o 2 , the surface residual alkali treatment steps are as follows:

[0043] The lithium-ion battery high-nickel ternary cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 placed in a confined space;

[0044] The citric acid aqueous solution of 0.5wt% aluminum nitrate is used to generate ultrafine particles by an ultrafine particle generator;

[0045] Transport the ultrafine particles to a closed space, and treat them for 20 minutes under normal temperature and pressure conditions. The dried samples are placed in a muffle furnace with an oxygen atmosphere, and sintered at 600 ° C for 2 hours, and then naturally cooled to room temperature to obtain low residual alkali content of the ternary cathode material. The residual alkali content after treatment is 0.31wt% Li 2 CO 3 , 0.12wt% LiOH; the residual alkali co...

Embodiment 3

[0047] This embodiment provides a method for preparing a ternary positive electrode material, which specifically includes the following steps:

[0048] The lithium-ion battery high-nickel ternary cathode material LiNi 0.6 co 0.2 mn 0.2 o 2 placed in a confined space;

[0049] The citric acid aqueous solution of 0.5wt% zirconium nitrate is used to generate ultrafine particles by an ultrafine particle generator;

[0050] The ultrafine particles are transported to a closed space, and treated for 20 minutes under normal temperature and pressure conditions. The dried samples are placed in a muffle furnace with an oxygen atmosphere, and sintered at 500 ° C for 4 hours, and then naturally cooled to room temperature to obtain low residual alkali content of the ternary cathode material. The residual alkali content after treatment is 0.25wt% Li 2 CO 3 , 0.11wt% LiOH; the residual alkali content of this material before treatment is 0.5wt% Li 2 CO 3 , 0.35 wt% LiOH.

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Abstract

The invention provides a ternary cathode material and a preparation method thereof. The preparation method comprises: using an ultrafine particle generator to process the citric acid aqueous solution of soluble salts into ultrafine particles, that is, the treatment liquid of the ternary positive electrode material; The materials are mixed, processed for 1min-20min, dried and sintered to obtain the ternary positive electrode material. The ternary positive electrode material obtained by the preparation method of the invention has low residual alkali content on the surface and high electric capacity at the same time.

Description

technical field [0001] The invention relates to a preparation method of a ternary positive electrode material of a lithium ion battery, and belongs to the technical field of lithium ion batteries. Background technique [0002] Lithium-ion battery is a high-tech product. Nickel-cobalt-manganese (NMC) ternary materials are a new type of lithium-ion battery cathode materials developed in recent years. They have important advantages such as high capacity, good cycle stability, and moderate cost. Problems such as high cost, low stability of lithium manganese oxide material, and low capacity of lithium iron phosphate have been successfully applied in batteries, and the application scale has been rapidly developed. [0003] However, the relatively high residual alkali content on the surface of NMC or NCA (nickel-cobalt-aluminum ternary material) is a prominent problem in its practical application. The main reason for the high pH of the positive electrode material is the presence ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/58H01M10/0525H01M4/36H01M4/48C01G53/00
CPCC01G53/50C01P2006/40H01M4/366H01M4/48H01M4/505H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 王庆莉王辉李道聪丁楚雄史俊何磊朱文婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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