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Electrolyte containing lithium imide and battery using electrolyte

An electrolyte, lithium imide technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problems of large damage to graphite anodes and difficult to popularize and use, to reduce oxidative decomposition behavior, reduce chemical The effect of stability, high conductivity

Active Publication Date: 2015-11-18
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flame retardant additives are mostly phosphate esters, but conventional phosphate esters have great damage to graphite negative electrodes, and it is difficult to promote them in practice

Method used

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  • Electrolyte containing lithium imide and battery using electrolyte
  • Electrolyte containing lithium imide and battery using electrolyte
  • Electrolyte containing lithium imide and battery using electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of lithium phosphazene imide

[0025] Triethylamine is used as an acid-binding agent, and hexafluorocyclotriphosphazene and fluoroalkylsulfonamide are reacted to prepare phosphazene imine, and lithium carbonate is used to neutralize to prepare lithium phosphazene imide.

[0026] (2) Preparation of electrolyte

[0027] in an argon atmosphere glove box (H 2 O6 (1.0M) mixed, lithium pentafluorophosphazene trifluoromethanesulfonimide and VC (vinylene carbonate) accounted for 5% and 1% of the total weight, respectively. The above-mentioned raw materials are added in sequence, fully stirred evenly, and the lithium secondary battery electrolyte (free acid<15ppm, moisture<10ppm) of the present invention is obtained. The prepared electrolyte was used for flame retardant test and battery performance test, and the test results are summarized in Table 1.

[0028] (3) Preparation of positive pole piece

[0029] Dissolve 3% polyvinylidene fluoride (PVDF) in 1-meth...

Embodiment 2

[0037] The process is the same as in Example 1, except that the addition amount of lithium pentafluorophosphazene trifluoromethanesulfonimide is 0.5%.

Embodiment 3

[0039] The process is the same as in Example 1, except that the addition amount of lithium pentafluorophosphazene trifluoromethanesulfonimide is 2%.

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Abstract

The invention provides electrolyte containing lithium imide. The electrolyte comprises electrolyte lithium salt, lithium imide, a non-aqueous organic solvent and an additive, wherein the lithium imide is phosphonitrile lithium imide; the general molecular formula is as shown in the specification, wherein R1-5 is any one of -OR7 and -Li[NSO2-R6]; R6 is fluorine-containing alkyl with the carbon atom number of 0-8; and R7 is an alkane group with the carbon atom number of 1-10. The phosphonitrile lithium imide has excellent chemical and electrochemical stability, and is compounded with LiPF6 for use; through the complexing effect of phosphonitrile imine anions and PF5, the catalytic decomposition effect on a carbonic ester solvent caused by a strong lewis acid PF5 can be effectively avoided; the heat stability of the electrolyte is improved; and the cycle life and the high-temperature performance of a lithium ion battery are greatly improved.

Description

technical field [0001] The invention relates to the field of lithium secondary batteries, more specifically, the invention relates to a lithium secondary battery using an electrolyte solution containing lithium imide. Background technique [0002] Lithium secondary batteries have the advantages of high working voltage, high specific energy density, long cycle life, low self-discharge rate, no memory effect, and low environmental pollution. At present, in the consumer electronics market, lithium-ion batteries occupy the main market, and grow at a rate of about 10% every year. Due to the pressure of environmental pollution and energy crisis, countries all over the world have invested a lot of manpower and financial resources to develop electric vehicles, and the market demand has doubled in the past two years. As the core component of electric vehicles, power batteries require technological breakthroughs. At present, several important technical issues of power batteries incl...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/42H01M10/0567
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 韩鸿波仰永军罗乾万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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