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

A technology of conductive polymers and positive electrode materials, applied in the field of lithium-ion batteries, can solve the problems of low surface corrosion and low conductivity, achieve the effects of reducing the residual alkali content on the surface, good rate performance, and reducing the formation of cycle electrode cracks

Active Publication Date: 2022-05-17
UNIV OF ELECTRONICS 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 with a high nickel cathode material, the central layer is a spherical high nickel ternary material, the central layer surface is an overburden, and the cladding layer is poly3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, MnO from the inside to the outside 2 Poly3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS three-layer structure, the content of the cladding layer is 1 ~ 5wt of the entire cathode material.

[0031] The chemical formula of the high nickel ternary material is Li z Ni x Co y Mn 1-x-y O 2 , wherein 0.75≤x≤0.85, 0.075≤y≤0.125, 1.0≤z≤1.1.

[0032] The present embodiment also provides a method for preparing the above-described conductive polymer and transition metal oxide-coated high nickel cathode material, comprising the following steps:

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

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

Embodiment 2

[0045] A conductive polymer and transition metal oxide coated with a high nickel cathode material, the central layer is a spherical high nickel ternary material, the central layer surface is an overburden, and the cladding layer is poly3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, MnO from the inside to the outside 2 Poly3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS three-layer structure, the content of the cladding layer is 1 ~ 5wt of the entire cathode material.

[0046] The chemical formula of the high nickel ternary material is Li z Ni x Co y Mn 1-x-y O 2, wherein 0.75≤x≤0.85, 0.075≤y≤0.125, 1.0≤z≤1.1.

[0047] The present embodiment also provides a method for preparing the above-described conductive polymer and transition metal oxide-coated high nickel cathode material, comprising the following steps:

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

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

Embodiment 3

[0057] A conductive polymer and transition metal oxide coated with a high nickel cathode material, the central layer is a spherical high nickel ternary material, the central layer surface is an overburden, and the cladding layer is poly3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, MnO from the inside to the outside 2 Poly3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS three-layer structure, the content of the cladding layer is 1 ~ 5wt of the entire cathode material.

[0058] The chemical formula of the high nickel ternary material is Li z Ni x Co y Mn 1-x-y O 2 , wherein 0.75≤x≤0.85, 0.075≤y≤0.125, 1.0≤z≤1.1.

[0059] The present embodiment also provides a method for preparing the above-described conductive polymer and transition metal oxide-coated high nickel cathode material, comprising the following steps:

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

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

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Abstract

The invention provides a high-nickel positive electrode material coated with a conductive polymer and a transition metal oxide and a preparation method thereof. The center layer is a spherical high-nickel ternary material, and the surface of the center layer is a cladding layer, and the cladding layers are sequentially arranged from the inside to the outside. Poly(3,4‑ethylenedioxythiophene / polystyrene sulfonate PEDOT‑PSS, MnO 2 , the three-layer structure of poly 3,4-ethylenedioxythiophene / polystyrene sulfonate PEDOT-PSS, 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. The invention has higher discharge capacity, better cycle stability and rate performance, and the surface coating layer can effectively reduce the residual amount of lithium ions on the surface of the cathode material, thereby greatly inhibiting the propagation of LiF and HF during the cycle process, Thereby reducing the dissolution of transition metal ions and the formation of cycle electrode cracks.

Description

Technical field [0001] The present invention relates to the field of lithium-ion battery technology, in particular a conductive polymer and transition metal oxide alternately formed by a multilayer coated high nickel ternary cathode material and a preparation method thereof. Background [0002] Lithium-ion batteries have the characteristics of high power and high density, and are widely used in electric vehicles (EVs), hybrid electric vehicles (HEV) and energy storage systems. At present, low-nickel ternary batteries have been commercially produced and applied, but their low energy density has been unable to meet the demand, improve the content of nickel to achieve the improvement of ternary battery energy density that is, high nickel ternary materials is one of the main research directions. With the improvement of nickel content, the capacity and voltage of the battery also increase, but the material is also more unstable, and the increase in lithium-nickel mixed displacement l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36C01G53/00C25B1/21H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00B82Y40/00
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 ELECTRONICS SCI & TECH OF CHINA
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