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Core-shell structure multi-component composite material, preparation method thereof and a lithium ion battery comprising the multi-component composite material

A composite material, core-shell structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of complex production process, unfriendly environment, high energy consumption, low cost, uniform coating effect, processing simple craftsmanship

Inactive Publication Date: 2018-11-16
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-temperature performance of the material obtained by this method is better, but this method has undergone several heat treatments successively, the production process is complicated and the energy consumption is high, the polymer precursor needs to be dissolved in the organic solvent, and the organic solvent needs to be evaporated to dryness, and the cost is high and not friendly to the environment

Method used

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  • Core-shell structure multi-component composite material, preparation method thereof and a lithium ion battery comprising the multi-component composite material
  • Core-shell structure multi-component composite material, preparation method thereof and a lithium ion battery comprising the multi-component composite material
  • Core-shell structure multi-component composite material, preparation method thereof and a lithium ion battery comprising the multi-component composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0101] (1) Mix asphalt, water, and fatty acid polyethylene glycol ester in a ratio of 20:70:10, mechanically stir the mixture, and mix evenly to obtain an asphalt emulsified dispersion, which is the first liquid phase precursor.

[0102] (2) Mix artificial graphite with a particle size of 5-20 μm and sodium carboxymethyl cellulose in a ratio of 70:30, place the mixture in a fusion machine, adjust the speed to 1000 rpm, and the tool gap width to 0.03 cm, and the fusion time was 0.5 h to obtain the second precursor.

[0103] (3) Add the second precursor into the liquid phase first precursor, perform mechanical stirring, and mix evenly. Put the mixture precursor in the spray drying equipment for spray granulation. Nitrogen was used as a protective gas during the spray granulation process, the speed of the spray granulation equipment was 18,000 rpm, the temperature of the feed inlet was set at 250°C, the temperature of the discharge port was 100°C, and the feed rate was 150mL / min...

Embodiment 2

[0111] Mix asphalt, water and sodium lauryl sulfate according to the ratio of 25:70:5, mechanically stir the mixture, and mix evenly to obtain asphalt emulsified dispersion, which is the first liquid phase precursor.

[0112] (2) Mix natural spherical graphite and sodium carboxymethyl cellulose with a particle size of 5-20 μm in a ratio of 70:30, place the mixture in a fusion machine, adjust the rotating speed to 1000 rpm, and the tool gap width is 0.03 cm, and the fusion time was 0.5 h to obtain the second precursor.

[0113] (3) Add the second precursor into the liquid phase first precursor, perform mechanical stirring, and mix evenly. The mixture precursor was dried in a vacuum drying oven at a constant temperature of 120°C for 6 hours, and the vacuum degree was -0.1MPa. After the water evaporates, disperse with a VC mixer at a rotation speed of 1200 rpm for 3 minutes to obtain a composite third precursor.

[0114] (4) Place the composite third precursor in a bowl furnace...

Embodiment 3

[0116] (1) Mix coal tar, water and polyvinylpyrrolidone according to the ratio of 23:70:7, mechanically stir the mixture, and mix evenly to obtain the first liquid phase precursor.

[0117] (2) Mix natural crystalline graphite and natural rubber according to a ratio of 70:30, place the mixture in a fusion machine, adjust the rotating speed to 2000 rpm, the width of the tool gap is 0.15 cm, and the fusion time is 3 hours to obtain second precursor.

[0118] (3) Add the second precursor into the liquid phase first precursor, perform mechanical stirring, and mix evenly. Put the mixture precursor in the spray drying equipment for spray granulation. Nitrogen was used as a protective gas during the spray granulation process, the speed of the spray granulation equipment was 10,000 rpm, the temperature of the feed inlet was set at 200°C, the temperature of the discharge port was 80°C, and the feed rate was 500mL / min. The composite third precursor was obtained by spray granulation. ...

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Abstract

The invention discloses a core-shell structure multi-component composite material, a preparation method thereof and a lithium ion battery comprising the multi-component composite material. The multi-component composite material comprises a graphite core and an outer shell coating the surface of the core, and the outer shell comprises a chain-shaped hard carbon layer and a soft carbon layer from the inside to the outside. The method comprises the following steps: 1) mixing an amorphous carbon precursor, a solvent and a surfactant to obtain a liquid phase first precursor; 2) mixing the core material graphite and the chain polymer material, and carrying out surface modification treatment to obtain a second precursor; 3) adopting a second precursor and the first precursor of the liquid phase to prepare a composite third precursor through coating treatment, and carry out carbonization to obtain a core-shell structure multi-component composite material. The method of the invention is simple,the process is short, the cost is low, the environment is friendly and pollution-free, and the obtained multi-component composite material has the characteristics of high compaction density, high first reversible capacity and first coulomb efficiency, and excellent processing performance and low temperature performance.

Description

technical field [0001] The present invention relates to the field of negative electrode materials for lithium-ion batteries, and relates to a multi-component composite material with a core-shell structure, a preparation method thereof, and a lithium-ion battery comprising the multiple-component composite material, in particular to a multiple-component composite negative electrode material with a core-shell structure, a preparation method and A lithium ion battery comprising the multi-element composite negative electrode material. Background technique [0002] The application field of lithium-ion batteries has expanded from 3C consumer electronics to the field of new energy vehicles, which requires lithium-ion batteries to have low cost, long cycle, excellent rate charge and discharge performance, reliable safety and excellent low temperature charge and discharge performance . How to improve the rate performance and low-temperature charge-discharge performance of lithium-ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/587H01M10/0525C01B32/05
CPCC01B32/05H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 闫慧青肖玮黄健李豪君任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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