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Lithium-ion battery negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode material technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem that the high-capacity negative electrode material body cannot stably exert high-capacity performance, etc., to improve cycle stability, avoid mutual agglomeration, The effect of improving overall performance

Active Publication Date: 2018-01-12
欣旺达惠州动力新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a negative electrode material for lithium-ion batteries, which aims to solve the technical problem that the existing high-capacity negative electrode material body cannot stably exert high-capacity performance due to volume expansion and contraction

Method used

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  • Lithium-ion battery negative electrode material and preparation method thereof
  • Lithium-ion battery negative electrode material and preparation method thereof
  • Lithium-ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0037] refer to image 3 , the embodiment of the present invention also provides a preparation method of lithium ion battery negative electrode material, comprising:

[0038] S1: Weigh the first specified amount of low-molecular-weight organic amine or urea and disperse it in the low-molecular-weight organic acid in an equimolar ratio, and stir evenly to form oligomers with amino groups at the end.

[0039] Low molecular weight in this step means that the molecular weight is less than or equal to 1000, so that it can be easily dissolved and dispersed uniformly. Equivalent molar ratio can make the substance react completely. The generation of oligomers with amino groups at the end is conducive to the formation of a large number of hydrogen bonds, so as to increase the elastic properties of polymers, help to absorb the stress generated by the volume expansion of the negative electrode material body 1 during the charge and discharge process, and slow down the volume expansion an...

Embodiment 1

[0058] Mix malonic acid and malonic acid with a mass ratio of 4:6, then add urea in an equimolar ratio to the total mass of malonic acid and malonic acid and p-phenylenediamine accounting for 5% of the mass of urea , stir evenly, and react to form oligomers with amino groups at the end; disperse a specified amount of 0.1um SiO powder in deionized water, and add it to a specified amount of liquid phase pitch after being uniformly dispersed, and then place it in nitrogen at a high temperature of 900°C After carbonization for 5 hours, 4wt% carbon-coated SiO / C was obtained; SiO / C was dispersed in the ethanol-dissolved oligomer liquid with amino groups at the end, and then added in an amount of 85% of the amount of oligomers with amino groups at the end. The cross-linking agent adipic acid and polyethylene glycol with 2% mass of SiO powder form an elastic ion-conductive composite polymer coating layer at 200°C, wherein the polymer coating amount is 2%, and the single particle size i...

Embodiment 2

[0061] Mix malonic acid and malonic acid with a mass ratio of 5:5, then add diethylenetriamine in an equimolar ratio to the total mass of malonic acid and malonic acid and account for 10% of the mass of diethylenetriamine % of p-phenylenediamine, stir evenly, and react to form oligomers with amino groups at the end; disperse a specified amount of 1um SiO powder in deionized water, and add it to a specified amount of liquid phase pitch after uniform dispersion, and then place in High-temperature carbonization treatment at 1500°C in nitrogen for 4 hours to obtain 6wt% carbon-coated SiO / C; SiO / C was dispersed in ethanol-dissolved oligomer liquid with amino groups at the end, and then added in an amount equal to the mass of oligomers with amino groups at the end 100% of the polymeric cross-linking agent glutaric acid and 5% of the polyethylene glycol of the SiO powder mass form an elastic ion-conductive composite polymer coating layer at 300 ° C, wherein the polymer coating amount ...

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Abstract

The invention discloses a lithium-ion battery negative electrode material and a preparation method thereof. The lithium-ion battery negative electrode material comprises a negative electrode materialbody and an elastic ionic conductance polymer coating layer, wherein the negative electrode material body is coated with the elastic ionic conductance polymer coating layer; the elastic ionic conductance polymer coating layer comprises an elastic polymer material and an ionic conductance polymer material. The lithium-ion battery negative electrode material is subjected to performance improvement by adopting the elastic ionic conductance polymer coating layer, the elastic ionic conductance polymer coating layer can bear great stress expansion, and the interface stability of the negative electrode material body in the charging and discharging process is maintained, so that thickening of an SEI (Solid Electrolyte Interphase) film is inhibited, and thickness rebound of the negative pole piecein the circulating process is reduced; moreover, due to the ionic conductance characteristic of the elastic ionic conductance polymer coating layer, reductive decomposition of electrolyte on the surface of the negative electrode material body can be inhibited, and the cycling stability of the lithium-ion battery is improved while the lithium-ion migration rate is improved.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a negative electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] According to the "Technology Roadmap for Energy Saving and New Energy Vehicles" issued by the Ministry of Industry and Information Technology, by 2020, the energy density of a pure electric vehicle power battery unit must reach 350Wh / kg, and the system energy density must reach 250Wh / kg. However, according to the current high-nickel ternary The positive electrode (200mAh / g) matches the high-capacity graphite negative electrode (360mAh / g), and the limit value of the energy density of a single cell cannot exceed 300Wh / kg. The gram capacity of current commercial positive and negative electrode materials is very close to its theoretical gram capacity (layered ternary theoretical gram capacity is 273-278mAh / g, graphite negative electrode theoretical gram capacity i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCY02E60/10
Inventor 陈鹏褚春波张耀梁锐王明旺
Owner 欣旺达惠州动力新能源有限公司
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