Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of lithium ion battery and its positive plate

A lithium-ion battery and positive electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, battery manufacturing, etc., can solve the problems of time-consuming, increased process, increased battery cost, etc., to reduce production processes, improve production efficiency, The effect of reducing the probability of short circuit

Active Publication Date: 2015-11-25
DONGGUAN AMPEREX TECH +1
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the technologies disclosed in the above invention patents can reduce the risk of thermal runaway of lithium-ion batteries to a certain extent, the above-mentioned solutions will affect the cycle performance of the battery to a certain extent, and the above-mentioned solutions all involve multi-layer structures. , the actual operation will increase the process, more time-consuming, and will increase the cost of battery production

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
  • A kind of lithium ion battery and its positive plate
  • A kind of lithium ion battery and its positive plate
  • A kind of lithium ion battery and its positive plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Preparation of positive electrode sheet 10: LiCoO2 (LCO) powder, binder polyvinylidene fluoride, conductive agent (Super-P) and N-methylpyrrolidone (NMP) were uniformly mixed to obtain positive electrode slurry. The positive electrode slurry was evenly coated on the aluminum foil 11 with a thickness of 14 microns by a coating process, and the positive electrode sheet 10 was obtained after drying, rolling and slitting. Wherein, the weight average molecular weight of the binder polyvinylidene fluoride used is 800,000, and its mass percentage in the positive electrode membrane is 2.3%.

[0043] Preparation of negative electrode sheet 20: mix the above-mentioned negative electrode active material, thickener sodium carboxymethyl cellulose (CMC), conductive agent (Super-P) and binder styrene-butadiene rubber emulsion (SBR) with deionized water, Obtain negative electrode slurry. The negative electrode slurry was uniformly coated on the copper foil 21 with a thickness of 9 micr...

Embodiment 2

[0047] For the positive electrode sheet prepared in Example 2, the mass percentage of the binder polyvinylidene fluoride in the positive electrode film is 2.8%, and its molecular weight is 900,000. Others are with embodiment 1.

Embodiment 3

[0049] For the positive electrode sheet prepared in Example 2, the mass percentage of the binder polyvinylidene fluoride in the positive electrode diaphragm is 3.5%, its molecular weight is 1 million, and the conductive agent is carbon nanotubes. Others 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
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of lithium ion battery technologies, and specifically relates to an anode sheet used in a lithium ion battery. The anode sheet comprises an anode current collector and an anode film coated on the anode current collector. The anode film comprises anode active substances, a bonding agent and a conductive agent. The bonding agent is polyvinylidene difluoride with a weight average molecular weight no less than 800 thousand and no more than 1 million. The mass of the bonding agent takes 2.8% to 5% of the total mass of the anode film. A cross cut test is carried out upon the cohesion performance of the anode film on the current collector. The peeling area of the anode film is less than 10% of the total tested area. Compared to prior arts, according to the invention, security characteristic of the lithium ion battery is ensured, and circulation performance of the lithium battery is not influenced. According to the invention, production processes of the anode sheet are reduced, the production is safe and convenient, the production efficiency is improved, and the production cost is saved. Also, the invention provides a lithium ion battery employing the anode sheet.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery positive electrode sheet and a lithium ion battery using the positive electrode sheet with higher safety performance. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density and environmental protection, and have been widely used in portable electronic products. Lithium-ion batteries may be misused at the customer end (such as being subjected to accidental mechanical damage) resulting in an internal short circuit of the battery. In special cases, the internal short circuit will cause the battery to catch fire and explode, thereby causing damage to the user's property and personal safety. [0003] The internal short circuit forms of lithium-ion batteries can be roughly divided into the following four types: (1) the short circuit between the positive current collector (usually aluminum foil) and the neg...

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 Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCY02E60/122Y02P70/54Y02E60/10
Inventor 于子龙汪颖赵丰刚许瑞陈治谢远森
Owner DONGGUAN AMPEREX TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com