Silicon-based negative electrode of lithium ion battery and method for preparing silicon-based negative electrode of lithium ion battery

A lithium-ion battery and negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unsatisfactory stress, lack, and influence of adhesion, and achieve improved power performance, excellent elasticity, and high adhesion Effect

Active Publication Date: 2016-06-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of the polybutadiene phase in SBR, it is an adhesive with excellent viscoelasticity. Although SBR has shown excellent performance in traditional lithium-ion batteries, it still lacks performance in negative electrodes with nano-silicon materials.

Method used

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  • Silicon-based negative electrode of lithium ion battery and method for preparing silicon-based negative electrode of lithium ion battery
  • Silicon-based negative electrode of lithium ion battery and method for preparing silicon-based negative electrode of lithium ion battery
  • Silicon-based negative electrode of lithium ion battery and method for preparing silicon-based negative electrode of lithium ion battery

Examples

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Effect test

Embodiment 1

[0044]Coating the negative electrode slurry of the lithium ion battery on the copper foil to prepare the negative electrode of the lithium ion battery has a thickness of 50 microns. The weight ratio formula of each raw material in the slurry is: 15.0 parts by weight of graphite, 2.0 parts by weight of nano silicon powder, 2.5 parts by weight of conductive agent, 5.0 parts by weight of binder, 1.0 parts by weight of sodium carboxymethyl cellulose, deionized water 70.0 parts by weight. The particle size of the graphite is 300 mesh, and the fixed carbon content is more than or equal to 99.8%; the average diameter of the nano silicon powder is about 50 nanometers; the conductive agent is SuperP; the binder is polystyrene-polybutylacrylate - Polystyrene block copolymer latex, the molecular weight of the block copolymer is 15k-100k-15k, and the solid content of the latex is 35%.

[0045] The lithium-ion battery negative electrode slurry is prepared by the following processing techn...

Embodiment 2

[0048] Coating the negative electrode slurry of the lithium ion battery on the copper foil to prepare the negative electrode of the lithium ion battery has a thickness of 300 microns. The weight ratio formula of each raw material in the slurry is: 18.0 parts by weight of graphite, 1.0 parts by weight of nano silicon powder, 0.3 parts by weight of conductive agent, 8.0 parts by weight of binder, 1.5 parts by weight of sodium carboxymethyl cellulose, and 80.0 parts by weight of deionized water parts by weight. The particle diameter of described graphite is 400 orders, and fixed carbon content is more than or equal to 99.5%; The average diameter of nano-silicon powder is 80 nanometers; Described conductive agent is SuperS; Described binding agent is polystyrene-polybutylacrylate- Polystyrene block copolymer latex, the molecular weight of the block copolymer is 50k-150k-50k, and the solid content of the latex is 15%.

[0049] The lithium-ion battery negative electrode slurry is p...

Embodiment 3

[0052] Coating the negative electrode slurry of the lithium ion battery on the copper foil to prepare the negative electrode of the lithium ion battery has a thickness of 50 microns. The weight ratio formula of each raw material in the slurry is: graphite: 15 parts by weight, nano silicon powder 2 parts by weight, conductive agent 2.0 parts by weight, binder 1.0 parts by weight, sodium carboxymethyl cellulose 1.0 parts by weight, deionized water 80.0 parts by weight. The particle size of the graphite is 500 mesh, and the fixed carbon content is more than or equal to 99.9%; the average diameter of the nano silicon powder is about 100 nanometers; the conductive agent is carbon nanotubes; the binder is polystyrene-polyacrylic acid Butyl ester-polystyrene block copolymer latex, the molecular weight of the block copolymer is 15k-40k-15k, and the solid content of the latex is 30%.

[0053] The lithium-ion battery negative electrode slurry is prepared by the following processing tec...

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Abstract

The invention discloses a silicon-based negative electrode of a lithium ion battery and a method for preparing the silicon-based negative electrode of the lithium ion battery. The silicon-based negative electrode is prepared by coating a copper foil with negative electrode slurry. The negative electrode slurry is prepared from, by weight, 15.0-18.0 parts of graphite, 1.0-2.0 parts of nano silicon powder, 0.3-2.5 parts of conductive agent, 1.0-8.0 parts of binding agent, 1.0-1.5 parts of thickening agent and 70.0-80.0 parts of dispersing medium. By adoption of a polystyrene-polybutyl acrylate- polystyrene block polymer binding agent which is extremely high in silicon binding force and capable of providing high elasticity, volume variation of silicon in charging and discharging can be counteracted, and performances of a graphene-based negative electrode of the lithium ion battery are improved. The prepared high-energy-density negative electrode is 514mAh/g in energy density during 0.1C charging and discharging, and the power negative electrode is 349mAh/g in energy density in 2C charging and discharging. The silicon-based negative electrode of the lithium ion battery and the method for preparing the silicon-based negative electrode of the lithium ion battery have the advantages of easiness in raw material acquisition, technical simplicity and environment friendliness.

Description

technical field [0001] The invention relates to a silicon-based lithium ion battery, in particular to a silicon-based lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] Lithium-ion batteries began to be researched and developed in the early 1980s. They were initially mainly used in portable devices. As their market continued to expand, they also played an important role in various types of electric vehicles and energy storage systems. Compared with traditional secondary batteries, lithium-ion batteries have higher volume specific energy and mass specific energy, which can make the battery smaller and lighter, and are relatively energy-saving and environmentally friendly. Its obvious advantages and broad application prospects make it It has become a research hotspot that has attracted wide attention. The active material used in the current commercial lithium-ion battery negative electrode is graphite material, and the theor...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/386H01M4/622H01M10/0525Y02E60/10
Inventor 高翔张帆罗英武
Owner ZHEJIANG UNIV
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