Lithium battery negative electrode preparation method and lithium battery thereof

A lithium battery and negative electrode technology, applied in the field of batteries, can solve the problems of separation of positive and negative electrodes and separators, affecting battery life, etc., and achieve the effect of preventing reduction reaction, enhancing conductivity, and reducing battery internal resistance

Inactive Publication Date: 2011-12-21
邹平铭波电源有限公司
View PDF4 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the internal resistance of the battery in the traditional process, there is generally no active material in the contact part of the negative plate and the battery case during the assembly process, so that the copper foil current collector is in direct contact with the inner wall of the battery case. When the battery is charging, the potential of the negative electrode decreases and the electrolyte A reduction reaction will inevitably occur on the exposed surface of the copper foil current collector to generate gas, and the battery will swell, causing the positive and negative electrodes to be separated from the separator and affecting the battery life.

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
  • Lithium battery negative electrode preparation method and lithium battery thereof
  • Lithium battery negative electrode preparation method and lithium battery thereof
  • Lithium battery negative electrode preparation method and lithium battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Lithium battery negative electrode is prepared by the following method:

[0034] (1) Mix the negative electrode active material graphite, conductive carbon black, VGCF (nano carbon fiber), binder SBR (styrene-butadiene rubber), LA133 (water-based binder); the active material graphite, conductive carbon black, VGCF , SBR, LA133 ratio is (by weight): 80: 10: 1: 3: 6; the graphite is a spherical graphite with a particle size of 18.0-22.0 μm and a specific surface area ≤ 20.0 m 2 / g of two kinds of graphite mixed;

[0035] (2) Make a paste adhesive and apply it evenly on both sides of the copper foil;

[0036] (3) Then vacuum drying, rolling and cutting to form negative electrode sheets;

[0037] Its positive electrode is prepared by the following method:

[0038] LiFePO 4 , conductive graphite, and PVDF are mixed evenly in a weight ratio of 86:9:5, stirred into a paste, and evenly coated on both sides of the aluminum foil with a coating thickness of 16 μm. Dry under ni...

Embodiment 2

[0045] Lithium battery negative electrode is prepared by the following method:

[0046] Mix the negative electrode active material graphite, conductive carbon black, VGCF (nano carbon fiber), binder SBR (styrene-butadiene rubber), LA133 (water-based binder); the active material graphite, conductive carbon black, VGCF, SBR, The proportion of LA133 is (in parts by weight): 75:12:1.5:2:7; the graphite is spherical graphite with a particle size of 18.0-22.0 μm and a specific surface area of ​​≤20.0 m 2 / g of two kinds of graphite mixed;

[0047] All the other are with embodiment 1.

Embodiment 3

[0049] Lithium battery negative electrode is prepared by the following method:

[0050] Mix the negative electrode active material graphite, conductive carbon black, VGCF (nano carbon fiber), binder SBR (styrene-butadiene rubber), LA133 (water-based binder); the active material graphite, conductive carbon black, VGCF, SBR, The proportion of LA133 is (in parts by weight): 85:8:0.5:4:5; the graphite is spherical graphite with a particle size of 18.0-22.0 μm and a specific surface area of ​​≤20.0 m 2 / g of two kinds of graphite mixed;

[0051] All the other are with embodiment 1.

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
particle sizeaaaaaaaaaa
specific surface areaaaaaaaaaaa
densityaaaaaaaaaa
Login to view more

Abstract

The invention relates to the field of batteries, in particular to a lithium battery anode preparing method and a lithium battery prepared by an anode prepared by the method, and aims to provide a method for preparing a high-strength lithium battery anode. According to the technical scheme, the lithium battery anode preparing method comprises the following steps of: (1) uniformly mixing anode active substances such as graphite, conductive carbon black, nano carbon fibers, adhesive butadiene styrene rubber and a water-based adhesive, wherein the graphite is prepared by mixing spheroid-like graphite with the granularity of 18.0 to 22.0 mu m and graphite with the specific surface area of less than or equal to 20.0m<2> / g; (2) preparing a pasty adhesive, and uniformly coating the adhesive on two sides of a copper foil; and (3) performing vacuum drying, rolling, cutting, and thus obtaining an anode plate. The invention has the advantages that: the anode active substances cannot fall, the electrical conductivity is improved, and the internal resistance of the battery is reduced; therefore, the surface of a current collector is prevented from being subjected to a reduction reaction, and air bulking is avoided.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a method for preparing a negative electrode of a lithium battery and a lithium battery prepared by using the negative electrode prepared by the method. Background technique [0002] As a new generation of green high-energy rechargeable batteries, lithium-ion batteries have the characteristics of high voltage, high energy density, small self-discharge, and good cycle performance, and occupy a dominant position in many electrical appliances. Some small electric tools need to be charged and discharged at a high rate. The frequency of daily use is high, and the cycle can be used more than 10 times. If the service life of the electrical appliance is required to reach one year, the cycle life of the battery must reach about 3,000 times. Although the lithium-ion battery cycle The life performance is good. If the bonding strength of the negative electrode does not meet the requirements, the peel...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393H01M4/62H01M10/052
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 张曙光李迎赵冬云
Owner 邹平铭波电源有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap