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

Lithium ion battery and preparation method thereof

A lithium-ion battery and conductive agent technology, applied in the lithium-ion field, can solve problems such as insufficient electrolyte and short cycle life of lithium iron phosphate batteries, and achieve the effect of optimizing battery cell design and prolonging cycle life

Pending Publication Date: 2021-05-28
TIANNENG SAFT ENERGY JOINT CO
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of short cycle life of lithium iron phosphate battery and insufficient electrolyte after cycle, the purpose of the present invention is to provide a method that can prolong the cycle life of lithium iron phosphate battery

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 ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The positive electrode active material lithium iron phosphate (D 50 =0.55um), conductive agent SP, conductive agent CNT and positive electrode binder PVDF are weighed according to the weight ratio of 95:1:1:3, homogenized and coated on 12um aluminum foil, double-sided coated surface density 300g / m 2 , compacted density 2.25g / cm 3 , slitting, die-cutting, and making the positive electrode sheet;

[0026] Weigh the negative electrode active material graphite, conductive agent SP, negative electrode binder CMC and negative electrode binder SBR according to the weight ratio of 95.5:1:1.5:2, homogenize and coat on 4.5um copper foil, double-sided coating Area density 150g / m 2 , compacted density 1.50g / cm 3 , slitting, die-cutting, and making the negative electrode sheet;

[0027] The obtained positive electrode sheet and negative electrode sheet are laminated in a zigzag shape with a base film thickness of 12um and a double-sided adhesive layer thickness of 2um, with 29 l...

Embodiment 2

[0030] The positive electrode active material lithium iron phosphate (D 50 =1um), conductive agent SP, conductive agent CNT and positive electrode binder PVDF weighed according to the weight ratio of 94.5:1:1.5:3, homogenized and coated on 12um aluminum foil, double-sided coating surface density 280g / m 2 , compacted density 2.25g / cm 3 , slitting, die-cutting, and making the positive electrode sheet;

[0031] Weigh the negative electrode active material graphite, conductive agent SP, negative electrode binder CMC, and negative electrode binder SBR according to the weight ratio of 95:1.5:1.5:2, and coat it on 4.5um copper foil after homogenizing, double-sided coating Area density 140g / m 2 , compacted density 1.50g / cm 3 , slitting, die-cutting, and making the negative electrode sheet;

[0032] Laminate the obtained positive electrode sheet and negative electrode sheet in a zigzag shape with a base film thickness of 12um and double-sided adhesive layer thickness of 2um, with 3...

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
densityaaaaaaaaaa
densityaaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of lithium ions, and particularly relates to a lithium ion battery. According to the lithium ion battery, a positive plate, a negative plate and a diaphragm are laminated in a Z shape and are subjected to hot pressing and assembling to form the lithium ion battery; the positive plate comprises positive slurry, and the positive slurry comprises 93-96 wt% of a positive active material, 2-3 wt% of a conductive agent and 2-4 wt% of a positive binder; and the negative plate comprises negative slurry, and the negative slurry comprises 94.5-96.5 wt% of a negative active material, 1-2 wt% of a conductive agent and 2.5-3.5 wt% of a negative binder. According to the invention, the coating surface density and compaction density of the positive and negative electrodes are reduced; and the glued diaphragm is subjected to hot pressing, so the electrolyte wettability and the electrolyte retention of the positive and negative plates and the diaphragm are improved, the lithium iron phosphate battery is kept in a rich liquid state in a long-term cycle process, and the cycle life of the lithium iron phosphate battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium ions, and in particular relates to a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium iron phosphate batteries are favored by lithium battery experts around the world for their safety and reliability, long cycle life, stable discharge platform, low cost of raw materials, and environmental protection. They have achieved rapid development in recent years. Although lithium iron phosphate batteries have such great advantages, there are still many shortcomings in practical applications. One of the most prominent problems is that the battery cycle life cannot meet the target requirements. At present, the general service life of lithium iron phosphate single batteries is only Around 3000 laps. During the long-term cycle charge and discharge process, the electrolyte will be irreversibly consumed, and the lack of electrolyte will cause the capacity to decay too f...

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): H01M10/0525H01M4/136H01M4/133H01M10/0583
CPCH01M10/0525H01M4/136H01M4/133H01M10/0583Y02P70/50Y02E60/10
Inventor 查惟伟叶清张磊樊海英周建中李明钧张萍
Owner TIANNENG SAFT ENERGY JOINT CO
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