Monocrystal NCM ternary material coated with polythiophene

A polythiophene-coated, ternary material technology, applied in polycrystalline material growth, single crystal growth, single crystal growth, etc. Deterioration of polarization phenomena and other problems, to achieve the effect of maintaining structural stability and cycle stability, reducing polarization phenomena, and accelerating electronic conductivity

Inactive Publication Date: 2021-10-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, single crystal NCM ternary materials are generally larger micron-sized particles, and their electronic conductivity is poorer than that of polycrystalline NCM ternary materials, which will affect the electrochemical reaction and charge transfer on the surface of single crystal materials. Lead to the deterioration of the polarization phenomenon and the rapid decay of electrochemical performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1)Ni 0.8 co 0.1 mn 0.1 (OH) 2 with LiOH·H 2 O The solids are mixed evenly according to the molar ratio of 1:1.1, adding absolute ethanol, and grinding in a mortar. After the absolute ethanol is completely volatilized, put the material into a muffle furnace for calcination. First, the temperature is raised to 500°C at 2°C / min. , keep warm for 2h, then raise the temperature to 800°C at 5°C / min, keep warm for 18h, crush and sieve the calcined material, and obtain a single crystal NCM ternary cathode material with a particle size of 2-3μm;

[0033] (2) Add 0.1g of thiophene monomer to 20mL of ethanol, and continue to stir and disperse evenly at room temperature to obtain mixed solution 1;

[0034] (3) Add 10 g of single crystal NCM ternary material into the mixed solution 1, continue to stir and disperse to obtain the suspension 1;

[0035] (4) Suspension 1 is placed in an ice-water bath, then ferric chloride solution is added dropwise to carry out oxidative polymeriz...

Embodiment 2

[0041] (1)Ni 0.8 co 0.1 mn 0.1 (OH) 2 with LiOH·H 2 O The solids are mixed evenly according to the molar ratio of 1:1.15, added with absolute ethanol, and ground in a mortar. After the absolute alcohol is completely volatilized, the material is put into a muffle furnace for calcination. First, the temperature is raised to 550°C at 2°C / min , keep warm for 3h, then raise the temperature to 850°C at 5°C / min, keep warm for 16h, crush and sieve the calcined material, and obtain a single crystal NCM ternary cathode material with a particle size of 2-3μm;

[0042] (2) Add 0.5g of thiophene monomer to 20mL of ethanol, and continue to stir and disperse evenly at room temperature to obtain a mixed solution 1;

[0043] (3) Add 10 g of single crystal NCM ternary material into the mixed solution 1, continue to stir and disperse to obtain the suspension 1;

[0044] (4) Suspension 1 is placed in an ice-water bath, then potassium permanganate solution is added dropwise, oxidative polymer...

Embodiment 3

[0050] (1)Ni 0.8 co 0.1 mn 0.1 (OH) 2 with LiOH·H 2 O The solids are mixed evenly according to the molar ratio of 1:1.2, adding absolute ethanol, and grinding in a mortar. After the absolute ethanol is completely volatilized, the material is put into a muffle furnace for calcination. First, the temperature is raised to 600°C at 2°C / min. , keep warm for 5h, then raise the temperature to 900°C at 5°C / min, keep warm for 12h, crush and sieve the calcined material, and obtain a single crystal NCM ternary cathode material with a particle size of 2-3μm;

[0051] (2) Add 1g of thiophene monomer to 20mL of ethanol, and continue to stir and disperse evenly at room temperature to obtain mixed solution 1;

[0052] (3) Add 10 g of single crystal NCM ternary material into the mixed solution 1, continue to stir and disperse to obtain the suspension 1;

[0053] (4) Suspension 1 is placed in an ice-water bath, then potassium chloride solution is added dropwise, oxidative polymerization is...

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Abstract

The invention relates to a polythiophene-coated single crystal NCM ternary material, and belongs to the field of chemical energy storage batteries. The preparation method comprises the following steps: firstly, dispersing a thiophene monomer in an organic solvent, and then adding a single-crystal NCM ternary material for dispersion; adding an oxidizing agent into the turbid liquid, and oxidizing in an ice-water bath environment to finally prepare the polythiophene coated single crystal NCM ternary material. The polythiophene has the characteristics of a conductive polymer; the polythiophene is coated on the surface of the single crystal NCM ternary material, so that the lithium ion diffusion obstruction under a relatively long migration path can be reduced, the electronic conductivity of the single crystal NCM material is further enhanced, and the electrochemical reaction process and charge transmission on the surface of the material are accelerated. Thus, the polarization phenomenon and the voltage drop of the material in the charge-discharge cycle process are reduced, and the cycle stability of the material is improved. In addition, the polythiophene coating layer can also isolate the contact between the electrolyte and the single crystal NCM material, so that the side reaction of the interface is reduced.

Description

technical field [0001] The invention relates to a polythiophene-coated single-crystal NCM ternary material, which belongs to the field of chemical energy storage batteries. Background technique [0002] Under the background of vigorously promoting the development of the green energy industry in my country, new energy vehicles have attracted widespread attention as the primary choice to replace traditional fuel vehicles. Compared with traditional fuel vehicles, new energy vehicles use power batteries as energy storage and output devices, but the performance of current vehicle power batteries cannot completely replace the status of fuel vehicle engines. The main reason is the energy density of power batteries at this stage Low, unable to completely solve people's anxiety about the range of electric vehicles. NCM ternary materials (LiNi x co y mn 1-x-y o 2 , 0<x<1, 0<y<1, 0<(x+y)<1). The composition of the NCM ternary material is LiNi x co y mn 1-x-y ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C30B1/02C30B1/10C30B29/22C30B33/00
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525C30B29/22C30B1/02C30B1/10C30B33/00H01M2004/021H01M2004/028Y02E60/10
Inventor 苏岳锋张其雨陈来卢赟聂启军丁瑞李宁包丽颖黄擎曹端云陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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