Unlock instant, AI-driven research and patent intelligence for your innovation.

Organic matter/silicon composite material, battery negative electrode prepared from organic matter/silicon composite material and preparation method

A silicon composite material and battery negative electrode technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of unstable and irreversible lithium consumption, shedding, poor rate performance, etc., achieve excellent lithium conduction ability, improve power effect of density

Inactive Publication Date: 2021-02-19
苏州华赢新能源材料科技有限公司
View PDF1 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the volume of silicon changes greatly (>300%) during charge and discharge, which leads to the pulverization of silicon particles and falls off from the current collector, and at the same time causes the instability of the solid electrolyte interface film on its surface, resulting in a large amount of irreversible lithium consumption, which makes Silicon anode has poor cycle performance and poor rate performance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Organic matter/silicon composite material, battery negative electrode prepared from organic matter/silicon composite material and preparation method
  • Organic matter/silicon composite material, battery negative electrode prepared from organic matter/silicon composite material and preparation method
  • Organic matter/silicon composite material, battery negative electrode prepared from organic matter/silicon composite material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0042] The present invention also provides a method for preparing the negative electrode of the battery, comprising the following steps:

[0043] 1) Mix organic matter / silicon composite material, conductive agent, binder and dispersant to obtain electrode slurry;

[0044] 2) Coating the electrode slurry on the copper current collector to obtain the negative electrode of the battery.

[0045] The dispersant in step 1) of the present invention is preferably one or more of water, N-methylpyrrolidone, N,N-dimethylformamide and dimethyl sulfoxide, when there are several dispersants , preferably mixed in an equal mass ratio.

[0046] The mixing treatment in the present invention is preferably high-speed shear mixing treatment at room temperature, and the mixing treatment time is preferably 20-40 minutes, more preferably 30 minutes.

[0047] After the coating treatment of the present invention, before obtaining the negative electrode of the battery, the first drying, pressing, cutt...

Embodiment 1

[0050]After uniformly dispersing 6 mg of maleic acid and 0.7 g of nano-silicon in deionized water, raise the temperature to 60°C and stir for 7 hours until dry to obtain a mixed powder; place the obtained mixed powder in a drying oven at 60°C for 24 hours to remove residual solvent to obtain organic / silicon composites. Add 0.15g acetylene black and 0.15g polyvinyl alcohol to the above-mentioned organic / silicon composite material, and shear it in deionized water for 20 minutes to make it fully mixed to make an electrode slurry; apply the electrode slurry on the copper foil assembly On the fluid, use 2MPa / cm after drying at 60°C for 20h 2 The pressure is pressed, cut and dried under vacuum condition at 120° C. for 16 hours to obtain the lithium ion battery negative electrode.

Embodiment 2

[0052] After uniformly dispersing 9 mg of maleic acid and 0.7 g of nano-silicon in deionized water, heat up to 150°C and stir for 3 hours until dry to obtain a mixed powder; place the obtained mixed powder in a drying oven at 150°C for 6 hours to remove residual solvent to obtain organic / silicon composites. Add 0.08g graphene and 0.04g carboxymethyl cellulose to the above-mentioned organic matter / silicon composite material, and shear it at high speed in deionized water for 20min to make it fully mix to make electrode slurry; apply the electrode slurry on copper On the foil current collector, use 2MPa / cm after drying at 150°C for 6h 2 The pressure is pressed, cut and dried under vacuum condition at 150° C. for 8 hours to obtain the lithium ion battery negative electrode.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of lithium ion batteries, and provides an organic matter / silicon composite material which comprises organic matter and silicon in a mass ratio of (0.5-10):100. The organic matter contains a conjugated carbonyl structure. The invention also provides a battery negative electrode containing the organic matter / silicon composite material and a preparation method. The organic matter has excellent elasticity and flexibility, the volume expansion problem of silicon can be relieved, and the cycle life of the electrode is prolonged; the organic matter contains a conjugated carbonyl structure, so that the cycling stability of the electrode is further improved; the organic matter has excellent lithium conductivity, and the power density of the silicon negative electrode can be improved. When the organic matter / silicon composite material is applied to a lithium ion battery negative electrode, the specific capacity of the organic matter / silicon compositematerial at 10C is 2486mAh / g, and the specific capacity of the organic matter / silicon composite material at 0.2 C is still 2568mAh / g after the organic matter / silicon composite material is circulatedfor 100 circles.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an organic matter / silicon composite material, a battery negative electrode obtained therefrom, and a preparation method. Background technique [0002] The development of high specific energy, high power, and long-life anodes is critical to the large-scale application of lithium-ion batteries. Silicon materials have the advantages of high theoretical specific capacity (4200mAh / g), abundant raw materials, low price, and relatively little harm to the environment, and have become an important choice for high specific energy lithium-ion battery anode materials. However, the volume of silicon changes greatly (>300%) during the charging and discharging process, which leads to the pulverization of silicon particles and falls off from the current collector, and at the same time leads to the instability of the solid electrolyte interface film on its surface, resulting in a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H01M4/62H01M4/38H01M4/04H01M4/134H01M4/1395H01M10/0525
CPCH01M4/04H01M4/134H01M4/1395H01M4/386H01M4/62H01M10/0525Y02E60/10
Inventor 王艳郑洪河吕林泽沈鸣
Owner 苏州华赢新能源材料科技有限公司