Modified high nickel ternary positive electrode material and its preparation method and lithium ion battery

A positive electrode material, high-nickel technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability, low capacity and first Coulombic efficiency, and more residual lithium on the surface, so as to reduce residual lithium and improve initial Effect of improving discharge capacity and surface stability

Inactive Publication Date: 2018-06-26
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to: overcome the problems of existing high-nickel ternary positive electrode materials such as high residual lithium on the surface, poor cycle stability, low capacity and first Coulombic efficiency, etc. Modified high-nickel ternary positive electrode material coated with fast ion conductor and preparation method thereof, lithium ion battery

Method used

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  • Modified high nickel ternary positive electrode material and its preparation method and lithium ion battery
  • Modified high nickel ternary positive electrode material and its preparation method and lithium ion battery
  • Modified high nickel ternary positive electrode material and its preparation method and lithium ion battery

Examples

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Effect test

Embodiment 1

[0038] A modified high-nickel ternary positive electrode material coated with a fast ion conductor material (LLTO), wherein the high-nickel ternary positive electrode material is LiNi 0.8 co 0.1 mn 0.1 o 2 , the LLTO cladding accounts for LiNi 0.8 co 0.1 mn 0.1 o 2 0.3wt% by weight, cladding thickness is 20nm, LLTO is Li 0.2 La 0.6 TiO 3 ; The SEM image of the modified high-nickel ternary cathode material is as follows figure 2 As shown, the XRD pattern is as Figure 4 shown.

[0039] The preparation steps mainly include: adding tetrabutyl titanate, lanthanum nitrate, and lithium nitrate into ethanol in sequence according to the element ratio of 1:0.6:0.2 in molar ratio, stirring for about 30 minutes until completely dissolved, and then putting the solution in a water bath heated to 60°C in a medium temperature and kept stirring to evaporate the organic solvent, dried the obtained solid powder in a vacuum oven for 12 hours, and finally sintered the obtained powder ...

Embodiment 2

[0041] A modified high-nickel ternary positive electrode material coated with LLZO, wherein the high-nickel ternary positive electrode material is LiNi 0.8 co 0.1 mn 0.08 Zr 0.02 o 2 , the LLZO cladding accounts for LiNi 0.8 co 0.1 mn 0.08 Zr 0.02 o 2 0.3 wt% by weight, LLZO as Li 0.2 La 0.6 ZrO 3 .

[0042] Its preparation method is the same as that of Example 1, except that tetrabutyl titanate is replaced by zirconium nitrate, and the solvent is deionized water. The final Li 0.2 La 0.6 ZrO 3 coated LiNi 0.8 co 0.1 mn 0.08 Zr 0.02 o 2 The material is assembled as a positive electrode material into a buckle for capacity and first-efficiency tests.

Embodiment 3

[0044] A kind of LMPO modified high-nickel ternary cathode material, wherein, the high-nickel ternary cathode material is LiNi 0.8 co 0.1 mn 0.1 o 2 , the LMPO coating accounts for the LiNi 0.8 co 0.1 mn 0.1 o 2 0.3wt% by weight, LiMPO 4 for Li 2 AlPO 4 .

[0045] Its preparation method is to add ammonium dihydrogen phosphate, aluminum nitrate, and lithium nitrate into deionized water in sequence according to the element ratio of 1:1:2 by molar ratio, and the rest of the steps are the same as in Example 1 to obtain the fast ion conductor Li 2 AlPO 4 coated LiNi 0.8 co 0.1 mn 0.1 o 2 , using it as a positive electrode material, assembled into a buckle according to the method of Example 1 for capacity and first effect tests.

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Abstract

The invention discloses a modified high nickel ternary positive electrode material. The surface of a high nickel ternary positive electrode material is coated with a coating layer containing a fast ion conductor. The fast ion conductor has the chemical general formula of Li3x1La2/3-x1Ma1TiNz1O3, Li2+2x2Zn1-x2GeO4 or LiM'2(PO4)3, wherein M represents Ba<2+> and/or Sr<2+>, N represents Al<3+> and/orZr<4+>, x1 is greater than or equal to 0.04 and less than or equal to 0.167, a1 is greater than or equal to 0 and less than or equal to 1, z1 is greater than or equal to 0 and less than or equal to 1, x2 is greater than -0.3 and less than 0.8, and M' represents one or more of Zr, Ti, Ge and Hf. Compared with the existing positive electrode material, the modified high nickel ternary positive electrode material is provided with the coating layer containing the fast ion conductor and the coating layer can react with residual lithium on the surface of the material to reduce residual lithium on the surface of the material and inhibit side reactions of the residual lithium and the electrolyte so that material surface stability and cycle performances are improved. The modified high nickel ternary positive electrode material has good lithium ion deintercalation ability, improves the first discharge capacity of the material and first coulombic efficiency and has a good application prospect. The invention also discloses a preparation method of the modified high nickel ternary positive electrode material and a lithium ion battery.

Description

technical field [0001] The invention belongs to the field of new energy materials. More specifically, the invention relates to a modified high-nickel ternary positive electrode material coated with a fast ion conductor on the surface, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the development of lithium-ion battery technology, the existing low-nickel ternary materials cannot meet people's demand for high-energy-density power batteries due to their low energy density. Increasing the nickel content of high-nickel ternary cathode materials can increase the energy density of batteries. Therefore, high-nickel ternary cathode materials are currently one of the main research objects for power batteries. However, due to the increase in the content of highly oxidized nickel and the increase in the charge cut-off voltage, the stability of high-nickel ternary cathode materials begins to deteriorate. When applied to power batteries, power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 孟焕平柳娜徐中领杜锐刘永王嗣慧
Owner CONTEMPORARY AMPEREX TECH CO
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