Electrolyte for improving cycle performance of anode materials of lithium-ion batteries

A lithium-ion battery and negative electrode material technology, applied in the field of graphite negative electrode, electrolyte solution for improving the cycle performance of carbon negative electrode, silicon-based negative electrode and tin-based negative electrode, can solve the problems of complex process, high cost, low repeatability, etc., and achieve improvement Effects of cycle performance, reduction of membrane resistance, and improvement of composition

Inactive Publication Date: 2015-12-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the modification of the surface film of the electrode is mainly realized by modifying the negative electrode and the electrolyte. Among them, the modificatio

Method used

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  • Electrolyte for improving cycle performance of anode materials of lithium-ion batteries
  • Electrolyte for improving cycle performance of anode materials of lithium-ion batteries
  • Electrolyte for improving cycle performance of anode materials of lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix ethylene carbonate (EC) and dimethyl carbonate (DMC) (the mass ratio of EC to DMC is EC:DMC=1:2), remove water and impurities with molecular sieve, and dissolve 1mol / L lithium hexafluorophosphate into the mixed solvent , and then adding 0.5wt% tris(2,2,2-trifluoroethyl) borate (TTFEB) to obtain the lithium-ion battery electrolyte.

Embodiment 2

[0020] Mix ethylene carbonate (EC) and dimethyl carbonate (DMC) (the mass ratio of EC to DMC is EC:DMC=3:7), remove water and impurities with molecular sieve, and dissolve 1mol / L lithium hexafluorophosphate into the mixed solvent , and then adding 0.5wt% tris(2,2,2-trifluoroethyl) borate (TTFEB) to obtain the lithium-ion battery electrolyte.

Embodiment 3

[0022] Mix ethylene carbonate (EC) and dimethyl carbonate (DMC) (the mass ratio of EC to DMC is EC:DMC=4:6), remove water and impurities with molecular sieve, and dissolve 1mol / L lithium hexafluorophosphate into the mixed solvent , and then adding 0.5wt% tris(2,2,2-trifluoroethyl) borate (TTFEB) to obtain the lithium-ion battery electrolyte.

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Abstract

The invention discloses an electrolyte for improving cycle performance of anode materials of lithium-ion batteries. The electrolyte comprises an organic solvent, lithium salt and an additive, wherein the additive is TTFEB (tri-(2,2,2-trifluoroethyl)borate), and the organic solvent comprises cyclic carbonate and linear carbonate. The added additive, namely, the TTFEB, of the electrolyte facilitates formation of stable SEI films on anode surfaces, prevents co-embedment of solvent molecules, and inhibits further reactions of anodes and the electrolyte. Meanwhile, through addition of the TTFEB, the composition of the SEI films can be improved, inert components such as LiF, Li2O, Li2O2 and the like are promoted, film impedance is reduced, polarization is reduced, and consumption of the lithium-ions is reduced. The TTFEB has an improving effect on the SEI films of the anodes, so that the electrolyte containing the TTFEB can effectively improve the cycle performance of the anode materials, the charging and discharging efficiency and the rate capability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries and relates to an electrolyte solution for improving the cycle performance of carbon negative electrodes, graphite negative electrodes, silicon-based negative electrodes and tin-based negative electrodes. Background technique [0002] With the development of human society, traditional fossil energy sources such as oil and natural gas continue to be exhausted, and people are paying more and more attention to environmental protection issues. It is imminent to develop new green and environmentally friendly energy sources and new and efficient energy storage technologies. Lithium-ion batteries have the advantages of small size, high energy density, high working voltage, long cycle life, environmental friendliness, no memory effect and small self-discharge, so they are widely used in portable electronic devices such as mobile phones, digital cameras, and notebook computers. With the advancement of ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 马玉林高云智左朋建杜春雨程新群尹鸽平
Owner HARBIN INST OF TECH
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