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Modified high-voltage positive electrode material and preparation method and application thereof

A positive electrode material, high voltage technology, applied in the direction of active material electrodes, positive electrodes, battery electrodes, etc., can solve the problems of easy erosion, increase of lithium ion transmission impedance, dissolution of surface active substances, etc., achieve uniform and controllable growth, promote Development and application, the effect of excellent cycle stability

Active Publication Date: 2020-08-07
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, especially for the characteristics of high activity and easy erosion of the surface of the positive electrode material under high voltage, and the direct contact with the electrolyte is very prone to side reactions, including the dissolution of surface active substances. , surface structure collapse and lithium ion transmission impedance increase, etc., leading to technical defects such as material performance degradation:

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  • Modified high-voltage positive electrode material and preparation method and application thereof
  • Modified high-voltage positive electrode material and preparation method and application thereof
  • Modified high-voltage positive electrode material and preparation method and application thereof

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Embodiment 1

[0063] A modified high-voltage cathode material of the present invention, comprising a high-voltage cathode material core and a conductive polymer shell coated on the surface of the high-voltage cathode material core, such as figure 1 as indicated. In this embodiment, the high-voltage positive electrode material is a lithium-rich solid solution positive electrode material, and the conductive polymer is a polythiophene derivative PEDOT:PSS.

[0064] In this embodiment, the general formula of the lithium-rich solid solution positive electrode material is expressed as follows:

[0065] z 1 Li 2 MnO 3 ·(1-z 1 )LiNi x1 mn y1 co (1-x1-y1) o 2 (x 1 =0.2,y 1 = 0.6, z 1 = 0.4).

[0066] In this embodiment, the thickness of the conductive polymer material is between 0.002 μm and 0.01 μm, and the thickness of the conductive polymer shell layer can be regulated by changing the amount of the polymer.

[0067] A preparation method of the modified high-voltage cathode material o...

Embodiment 2

[0080] A modified high-voltage cathode material of the present invention, comprising a high-voltage cathode material core and a conductive polymer shell coated on the surface of the high-voltage cathode material core, such as figure 1 as indicated. In this embodiment, the high-voltage positive electrode material is a lithium-rich solid solution positive electrode material, and the conductive polymer is a polythiophene derivative PEDOT.

[0081] In this embodiment, the general formula of the lithium-rich solid solution positive electrode material is expressed as follows:

[0082] z 1 Li 2 MnO 3 ·(1-z 1 )LiNi x1 mn y1 co (1-x1-y1) o 2 (x 1 =0.2,y 1 = 0.5, z 1 = 0.4).

[0083] In this embodiment, the thickness of the conductive polymer material is 0.002 μm˜0.01 μm.

[0084] A preparation method of the modified high-voltage cathode material of the present embodiment, comprising the following steps:

[0085] (1) configure the mixed solution containing conductive polym...

Embodiment 3

[0098] A modified high-voltage cathode material of the present invention, comprising a high-voltage cathode material core and a conductive polymer shell coated on the surface of the high-voltage cathode material core, such as figure 1as indicated. In this embodiment, the high-voltage positive electrode material is a high-voltage nickel-manganese spinel positive electrode material, and the conductive polymer is a polythiophene derivative PEDOT:PSS.

[0099] In this embodiment, the general formula of the high-voltage nickel-manganese spinel positive electrode material is expressed as:

[0100] LiNi x mn 2-x o 4 (x=0.5).

[0101] In the high-voltage positive electrode material of this embodiment, the high-voltage nickel-manganese spinel positive electrode material (ie, the core material) is granular, and is a nano-scale positive electrode material synthesized by the sol-gel method, and the thickness of the conductive polymer shell is 0.002 μm ~0.01 μm.

[0102] A preparatio...

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Abstract

The invention discloses a modified high-voltage positive electrode material as well as a preparation method and application thereof. The modified high-voltage positive electrode material comprises a high-voltage positive electrode material core and a conductive polymer shell layer coating the surface of the high-voltage positive electrode material core, the preparation method comprises the following steps: carrying out in-situ reaction by adopting a high-voltage positive electrode material, a conductive polymer monomer, a catalyst and an initiator or carrying out direct coating by adopting thehigh-voltage positive electrode material, a conductive polymer and a coupling agent. The modified high-voltage positive electrode material can gradually react with an electrolyte in a battery througha controllable electrochemical activation process to form a new surface compact coating layer, the surface impedance of the battery can be effectively reduced, the ion transmission performance is improved, the rate capability of the material is improved, and the preparation method is simple to operate, high in controllability, non-toxic, harmless, few in by-product and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and relates to a modified high-voltage positive electrode material and its preparation method and application, in particular to a conductive polymer-modified high-voltage positive electrode material and its preparation method and its application in lithium-ion batteries Applications. Background technique [0002] The rapid development of information technology has greatly promoted the progress of lithium-ion battery technology. As the driving power of many mobile electronic products, lithium-ion batteries have the advantages of high safety and no pollution, and have broad application prospects in the field of electric vehicles. [0003] At present, the basic principle of lithium-ion batteries is still based on the LiCoO battery proposed by Sony in 1990. 2 The principle of the "rocking chair" lithium-ion secondary battery as the positive electrode material and graphite as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 陈宇方田陌陌郑春满许静刘锦峰李德湛张红梅
Owner NAT UNIV OF DEFENSE TECH
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