Formation method of lithium ion battery

A technology of lithium-ion batteries and formation methods, which is applied in the field of formation of lithium-ion batteries, can solve problems such as life impact and battery cycle life, and achieve the effects of improving cycle life, improving cycle performance, and alleviating concentration polarization

Inactive Publication Date: 2020-07-03
朱虎
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The high-temperature stability of lithium-ion batteries is one of the safety performances of balancing lithium-ion batteries, and the choice of electrolyte is the primary factor affecting high-temperature safety. As a cyclic ester, propylene carbonate has good performance at high temperatures. As a high-temperature The use of electrolyte has good safety performance, but when graphite negative electrode is used as the negative electrode, the branched chain of propylene carbonate will be inserted into the interlayer of graphite material, resulting in interfacial reaction between the electrolyte and the negative electrode, thus affecting the cycle life of the battery. Especially in high temperature environment, the impact on life is more obvious, therefore, it is necessary to provide a solution that can overcome this defect

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Inject the first electrolytic solution into the battery, the first electrolytic solution accounts for 45% by volume of the total electrolytic solution; the organic solvent of the first electrolytic solution is ethylene carbonate, and the additive is 1,2-trifluoroacetic acid Ethyl ethane, its content is 12 volume %;

[0031] 2) 0.02C constant current charging to 2.8V, and then constant voltage charging at this voltage until the charging current is lower than 0.01C;

[0032] 3) 0.02C constant current charge and discharge cycle between 2.8V and 2.7V for 5 times;

[0033] 4) Inject the second electrolytic solution and let it stand for 1h. The second electrolytic solution accounts for 55% by volume of the total electrolytic solution; the organic solvent of the second electrolytic solution is propylene carbonate and dimethyl carbonate, and the carbonic acid The content of propylene ester is 50% by volume, the rest is dimethyl carbonate, the additives are dimethyl sulfoxid...

Embodiment 2

[0040] 1) Inject the first electrolytic solution into the battery, the first electrolytic solution accounts for 50% by volume of the total electrolytic solution; the organic solvent of the first electrolytic solution is ethylene carbonate, and the additive is 1,2-trifluoroacetic acid Ethyl ethane, its content is 8 volume %;

[0041] 2) 0.02C constant current charging to 2.85V, and then constant voltage charging at this voltage until the charging current is lower than 0.01C;

[0042] 3) 0.02C constant current charge and discharge cycle between 2.85V and 2.7V for 5 times;

[0043] 4) Inject the second electrolytic solution and let it stand for 1h. The second electrolytic solution accounts for 50% by volume of the total electrolytic solution; the organic solvent of the second electrolytic solution is propylene carbonate and dimethyl carbonate, and the carbonic acid The content of propylene ester is 60% by volume, the rest is dimethyl carbonate, the additives are dimethyl sulfoxi...

Embodiment 3

[0050] 1) Inject the first electrolytic solution into the battery, the first electrolytic solution accounts for 48% by volume of the total electrolytic solution; the organic solvent of the first electrolytic solution is ethylene carbonate, and the additive is 1,2-trifluoroacetic acid Ethane, its content is 10% by volume;

[0051] 2) 0.02C constant current charging to 2.82V, and then constant voltage charging at this voltage until the charging current is lower than 0.01C;

[0052] 3) 0.02C constant current charge and discharge cycle between 2.82V and 2.7V for 5 times;

[0053] 4) Inject the second electrolytic solution and let it stand for 1h. The second electrolytic solution accounts for 52% by volume of the total electrolytic solution; the organic solvent of the second electrolytic solution is propylene carbonate and dimethyl carbonate, and the carbonic acid The content of propylene ester is 55% by volume, the rest is dimethyl carbonate, the additives are dimethyl sulfoxide an...

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

No PUM Login to view more

Abstract

The invention provides a formation method of a lithium ion battery. A negative electrode active substance of the lithium ion battery is a graphite material; the electrolyte of the lithium ion batterycomprises lithium salt, an organic solvent and an additive, the organic solvent comprises ethylene carbonate, dimethyl carbonate and propylene carbonate, the additive comprises 1, 2-trifluoroacetic acid ethyl ethane, dimethyl sulfoxide and anisole, and the formation method comprises: injecting a first electrolyte accounting for 45-50 vol% of the total amount of the electrolyte, wherein the organicsolvent of the first electrolyte is ethylene carbonate, the additive is 1, 2-trifluoroacetic acid ethyl ethane, and the content of the 1, 2-trifluoroacetic acid ethyl ethane is 8-12% by volume; the organic solvent of the second electrolyte comprises propylene carbonate and dimethyl carbonate, the additives are dimethyl sulfoxide and anisole, and the content of dimethyl sulfoxide is 3.6-4.0% by volume and the content of the anisole is 0.15%-0.3% by volume; and performing formation to obtain the battery.

Description

technical field [0001] The invention relates to a method for forming a lithium ion battery. Background technique [0002] The high-temperature stability of lithium-ion batteries is one of the safety performances of balancing lithium-ion batteries, and the choice of electrolyte is the primary factor affecting high-temperature safety. As a cyclic ester, propylene carbonate has good performance at high temperatures. As a high-temperature The use of electrolyte has good safety performance, but when graphite negative electrode is used as the negative electrode, the branched chain of propylene carbonate will be inserted into the interlayer of graphite material, resulting in interfacial reaction between the electrolyte and the negative electrode, thus affecting the cycle life of the battery. Especially in a high-temperature environment, the impact on the lifespan is more obvious. Therefore, it is necessary to provide a solution that can overcome this defect. Contents of the inven...

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): H01M10/44H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/058H01M10/4235H01M10/446Y02E60/10Y02P70/50
Inventor 朱虎
Owner 朱虎
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