Electrolyte of lithium-ion secondary battery

A secondary battery and electrolyte technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as poor low-temperature performance, achieve low viscosity, expand low-temperature performance, and good electrochemical stability Effect

Inactive Publication Date: 2011-06-01
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to overcome the disadvantages of poor low-temperature performance of current lithium-ion secondary batteries, and provide an electrolyte for lithium-ion secondary batteries with good low-temperature performance, and the electrolyte also has good flame-retardant properties

Method used

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  • Electrolyte of lithium-ion secondary battery
  • Electrolyte of lithium-ion secondary battery
  • Electrolyte of lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In an Ar atmosphere glove box, EC (ethylene carbonate), EMC (ethyl methyl carbonate) and MP (methyl propionate) were mixed at a mass ratio of 20:55:25, and electromagnetically stirred, and LiPF6 electrolyte was added to configure The concentration is 1M electrolyte, and various functional additives are added thereto; In the obtained electrolyte, the contents of various additive components are respectively: VC (vinylene carbonate) 2w.t.%, 1, 3 -PS (1,3 propane sultone) 1w.t.%.

Embodiment 2

[0053] In an Ar atmosphere glove box, EC (ethylene carbonate), EMC (ethyl methyl carbonate) and MP (methyl propionate) were mixed at a mass ratio of 20:60:20, and electromagnetically stirred, and LiPF6 electrolyte was added to configure To form an electrolyte solution with a concentration of 1M, and add a variety of functional additives therein; in the obtained electrolyte solution, the contents of various additive components are: VC 2w.t.%, 1,3-PS 1.5w.t.%, (C 6 f 5 O) 3 B 4w.t.%.

Embodiment 3

[0055] In an Ar atmosphere glove box, EC (ethylene carbonate), EMC (ethyl methyl carbonate), MP (methyl propionate) and DTA (N,N-dimethyltrifluoroacetamide) were mixed in a mass ratio of 15 : 45: 15: 15 mixed, and carry out electromagnetic stirring, add LiPF6 Electrolyte is configured into the electrolytic solution that concentration is 1M, and adds multiple functional additives thereinto; In the electrolytic solution that obtains, the content of various additive components is respectively : VC 1.5w.t.%, 1,3-PS2w.t.%, (C 6 f 5 O) 3 B 3w.t.%.

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Abstract

The invention discloses an electrolyte of a lithium-ion secondary battery, which adopts fluoro-carbonate, high molecular weight chain carbonate and N, N-dimethyl trifluoro ethyl amide as cosolvent, and an organboron compound as an enhanced conductivity additive, and also contains film forming additive vinylene carbonate, 1,3-propyl sultone and a non-aqueous organic solvent in which lithium salt is dissolved. The battery assembled by using the electrolyte has good charging performance and discharging performance at low temperature, and the flame retardant property of the electrolyte is remarkably improved as the fluoro-carbonate is added.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium-ion secondary batteries, in particular to an electrolyte solution of a lithium-ion secondary battery with good working performance in a low-temperature environment. 【Background technique】 [0002] Lithium-ion battery is a new type of secondary battery, which has the advantages of high working voltage, high specific energy, long charge and discharge life, low self-discharge rate, no pollution and no memory effect, etc. It occupies a dominant position in the global secondary battery market , the application range is more and more extensive, including portable electronic devices, such as notebook computers, mobile phones, video cameras, cameras and other consumer digital products, and gradually replace them in the fields of aviation, aerospace, navigation, small medical instruments and military communication equipment. conventional battery. Widespread demands place higher demands on the performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42
CPCY02E60/12Y02E60/10
Inventor 陈晴川陈柏源侯涛汤敏敏
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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