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High-stability power battery electrolyte

A high-stability technology for power batteries, applied in the field of electrolytes for high-stability power batteries, can solve the problems of shortening the storage time of electrolytes and the inability to suppress the rise of chroma, so as to avoid white precipitates, irritating problems, and high temperature The effect of excellent cycle performance

Inactive Publication Date: 2016-08-24
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of stabilizer cannot inhibit the rise of chroma, and it is easy to produce white precipitates during long-term storage with the electrolyte. Although it solves the problems of electrolyte moisture and acidity, it produces new quality problems, which seriously shortens the storage of electrolyte. time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Electrolyte solution preparation steps: In a glove box filled with argon, mix ethylene carbonate, ethyl methyl carbonate and diethyl carbonate according to the mass ratio of EC:EMC:DEC=3:5:2, and then add to the mixed solution Slowly add lithium hexafluorophosphate with a concentration of 1.0mol / L, and finally add 2wt% vinylene carbonate (VC), 300ppm triphenyl phosphite (TPPi), 300ppm N,N'-dicyclohexylcarbodi imine (DCC), after stirring evenly, obtain the lithium ion battery electrolyte of embodiment 1.

[0026] Lithium iron phosphate power battery 0.5C@60℃ cycle test:

[0027] Inject the lithium-ion battery electrolyte prepared in the above steps into the fully dried graphite / LiFePO 4 In the prismatic power battery, after the battery is left at 45°C, formed, clamped, re-sealed, and routinely divided, it is subjected to a 0.5C@60°C cycle test: at 60°C, the battery after capacity-divided is subjected to a constant current of 0.5C Charge to 3.65V at constant voltage, cu...

Embodiment 2～9

[0028] Embodiment 2~9 and comparative example 1~6

[0029] Examples 2-9 and Comparative Examples 1-6 are the same as Example 1 except that the composition and content of the electrolyte solvent, additives and stabilizer are added as shown in Table 1.

[0030]

[0031]

[0032] In the above Table 1, the abbreviated names of each chemical substance are as follows:

[0033] EC (ethylene carbonate), PC (propylene carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), VC (vinylene carbonate), LiFSi (lithium difluorosulfonyl imide), DTD (vinyl sulfate), MMDS (methylene disulfonate), TPPi (triphenyl phosphite), TMPi (trimethyl phosphite), DCC (N,N'-dicyclohexylcarbodiimide) , DIC (N,N'-diisopropylcarbodiimide), HMDS (hexamethyldisilazane).

[0034] Electrolyte storage chromaticity, acidity test:

[0035] Put the lithium-ion battery electrolyte prepared in the above steps into an imported sealed aluminum bottle in the glove box, and the aluminum bottle is vacuum-p...

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Abstract

The invention discloses a high-stability power battery electrolyte. The high-stability power battery electrolyte comprises lithium hexafluorophate, a non-aqueous solvent, an additive and an electrolyte stabilizer, wherein the electrolyte stabilizer is combination of a phosphite ester compound and a carbodiimide compound. The phosphite ester stabilizer of the electrolyte provided by the invention and PF5 can form a complex of a sexadentale body, the reaction activity of the PF5 is reduced, side reaction of impurity in the PF5 and the electrolyte is reduced, and the acidity and the chromaticity of the electrolyte in a high-temperature condition are prevented from rapidly rising; and meanwhile, the carbodiimide stabilizer can generate slow hydrolysis reaction in the electrolyte, the slight amount of HF in the electrolyte can be effectively captured by an alkali hydrolysis product, thus, the moisture content in the electrolyte is effectively reduced, and the acidity of the electrolyte is prevented from rising. With the adoption of a power battery prepared from the electrolyte provided by the invention, the comprehensive performance of the battery is excellent, and the high-temperature cycle performance at 60 DEG C is excellent.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion batteries, in particular to a high-stability power battery electrolyte. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, high voltage, long cycle life, and environmental friendliness, and are widely used in digital, energy storage, power, military aerospace, and communication equipment and other fields. [0003] As an important part of lithium-ion batteries, the electrolyte plays a role in transporting charge between the positive and negative electrodes of the battery, and is crucial to the capacity performance, cycle performance and high and low temperature performance of the battery. Electrolyte products are affected by the purity of raw materials and the production and preparation process, and the following trace impurities inevitably exist: H 2 Substances such as O, HF, alcohols, aldehydes, ketones and amines. The above trace...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 曾庆鹏仰永军吕家斌万华平潘立宁
Owner GUANGZHOU TINCI MATERIALS TECH
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