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Conductive polymer and transition metal oxide coated high-nickel positive electrode material and method

A conductive polymer and transition metal technology, applied in the field of lithium-ion batteries, can solve problems such as low surface corrosion conductivity, and achieve the effects of reducing surface residual alkali content, inhibiting dissolution, and reducing internal cracks

Active Publication Date: 2021-05-07
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a surface-coated high-nickel ternary material for the technical problem of low electrical conductivity of the existing surface corrosion

Method used

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  • Conductive polymer and transition metal oxide coated high-nickel positive electrode material and method

Examples

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Embodiment 1

[0030] A conductive polymer and transition metal oxide coated high-nickel positive electrode material, the center layer is a spherical high-nickel ternary material, the surface of the center layer is a cladding layer, and the cladding layer is poly-3,4- Ethylenedioxythiophene / polystyrenesulfonate PEDOT-PSS, MnO 2 1. A three-layer structure of poly 3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, the content of the coating layer is 1-5 wt% of the whole positive electrode material.

[0031] The chemical formula of the high-nickel ternary material is Liz Ni x co y mn 1-x-y o 2 , where 0.75≤x≤0.85, 0.075≤y≤0.125, 1.0≤z≤1.1.

[0032] This embodiment also provides a method for preparing the above-mentioned conductive polymer and transition metal oxide-coated high-nickel positive electrode material, comprising the following steps:

[0033] Step 1: Preparation of high nickel ternary material:

[0034] 1.1 The precursor is prepared by co-precipitation method, the nicke...

Embodiment 2

[0045] A conductive polymer and transition metal oxide coated high-nickel positive electrode material, the center layer is a spherical high-nickel ternary material, the surface of the center layer is a cladding layer, and the cladding layer is poly-3,4- Ethylenedioxythiophene / polystyrenesulfonate PEDOT-PSS, MnO 2 1. A three-layer structure of poly 3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, the content of the coating layer is 1-5 wt% of the whole positive electrode material.

[0046] The chemical formula of the high-nickel ternary material is Li z Ni x co y mn 1-x-y o 2 , where 0.75≤x≤0.85, 0.075≤y≤0.125, 1.0≤z≤1.1.

[0047] This embodiment also provides a method for preparing the above-mentioned conductive polymer and transition metal oxide-coated high-nickel positive electrode material, comprising the following steps:

[0048] Step 1: Preparation of high nickel ternary material:

[0049] 1.1 The precursor is prepared by the co-precipitation method, the...

Embodiment 3

[0057] A conductive polymer and transition metal oxide coated high-nickel positive electrode material, the center layer is a spherical high-nickel ternary material, the surface of the center layer is a cladding layer, and the cladding layer is poly-3,4- Ethylenedioxythiophene / polystyrenesulfonate PEDOT-PSS, MnO 2 1. A three-layer structure of poly 3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, the content of the coating layer is 1-5 wt% of the whole positive electrode material.

[0058] The chemical formula of the high-nickel ternary material is Li z Ni x co y mn 1-x-y o 2 , where 0.75≤x≤0.85, 0.075≤y≤0.125, 1.0≤z≤1.1.

[0059] This embodiment also provides a method for preparing the above-mentioned conductive polymer and transition metal oxide-coated high-nickel positive electrode material, comprising the following steps:

[0060] Step 1: Preparation of high nickel ternary material:

[0061] 1.1 The precursor is prepared by the co-precipitation method, the...

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Abstract

The invention provides a conductive polymer and transition metal oxide coated high-nickel positive electrode material and a preparation method thereof. A central layer is a spherical high-nickel ternary material, the surface of the central layer is a coating layer, and the coating layer comprises a three-layer structure composed of poly(3,4-ethylene dioxythiophene) / polystyrene sulfonate PEDOT-PSS, MnO2, and poly(3,4-ethylene dioxythiophene) / polystyrene sulfonate PEDOT-PSS. The chemical formula of the high-nickel ternary material is Li Ni<x>Co<y>Mn<1 x y>O2, wherein the conditons are 0.75<=x<=0.85, 0.075<=y<=0.125, and 1.0<=z<=1.1. The conductive polymer has higher discharge capacity and better cycle stability and rate performance, and the surface coating layer can effectively reduce the residual quantity of lithium ions on the surface of the cathode material, so that the propagation of LiF and HF in the cycle process is greatly inhibited, and the dissolution of transition metal ions and the formation of cycle electrode cracks are reduced.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a multilayer-coated high-nickel ternary positive electrode material formed alternately of conductive polymers and transition metal oxides and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles (EV), hybrid electric vehicles (HEV) and energy storage systems due to their high power and high density. At present, low-nickel ternary batteries have been commercially produced and applied, but their low energy density can no longer meet the demand. Increasing the nickel content to increase the energy density of ternary batteries, that is, high-nickel ternary materials, is currently the main research one of the directions. As the nickel content increases, the capacity and voltage of the battery also increase, but the material is also more unstable. The increase in lithium-nickel mixing leads to distortion o...

Claims

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Application Information

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IPC IPC(8): C01G53/00C25B1/21H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCC01G53/006C25B1/21H01M4/366H01M4/624H01M4/628H01M4/505H01M4/525H01M10/0525B82Y30/00B82Y40/00H01M2220/10H01M2220/20H01M2004/028C01P2004/84C01P2006/40Y02E60/10
Inventor 廖家轩刘娜吴孟强彭雪枫杨俭
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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