Electrolyte for lithium titanate lithium ion battery

A technology of lithium ion battery and electrolyte, applied in the field of electrolyte and electrolyte of lithium titanate lithium ion battery

Inactive Publication Date: 2015-09-09
SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a kind of electrolyte for lithium titanate battery, solve or alleviate the problem of LTO battery flatulence

Method used

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  • Electrolyte for lithium titanate lithium ion battery
  • Electrolyte for lithium titanate lithium ion battery
  • Electrolyte for lithium titanate lithium ion battery

Examples

Experimental program
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Embodiment 1

[0027] 12 parts of lithium hexafluorophosphate, 20 parts of dehydrated ethylene carbonate, 5 parts of propylene carbonate, 20 parts of dimethyl carbonate, 10 parts of diethyl carbonate, 30 parts of ethyl methyl carbonate, 0.5 parts of difluorooxalate lithium borate and 2.5 parts of vinyl esters were uniformly mixed and dissolved at 25° C. to obtain the electrolyte solution (1) of the present invention. The water content of the electrolytic solution (1) was 15 ppm. The water content in the electrolyte was measured by the Karl Fischer method.

Embodiment 2

[0029] 13 parts of lithium hexafluorophosphate, 10 parts of dehydrated ethylene carbonate, 15 parts of propylene carbonate, 30 parts of dimethyl carbonate, 30 parts of ethyl methyl carbonate, and 2 parts of fluoroethylene carbonate were uniformly mixed and dissolved at 25°C to obtain the present invention electrolyte (2). The water content of the electrolytic solution (2) was 25 ppm.

Embodiment 3

[0031] 14 parts of lithium hexafluorophosphate, 20 parts of dehydrated propylene carbonate, 30 parts of dimethyl carbonate, 20 parts of ethyl methyl carbonate, 10 parts of γ-butyrolactone, 2 parts of lithium bisoxalate borate and 4 parts of vinyl vinyl carbonate Uniformly mix and dissolve at 25°C to obtain the electrolyte solution (3) of the present invention. The water content of the electrolytic solution (3) was 25 ppm.

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Abstract

The invention discloses electrolyte for a lithium titanate lithium ion battery. The electrolyte for the lithium titanate lithium ion battery comprises main electrolyte lithium salts, auxiliary electrolyte lithium salts, non-aqueous solvent and additives, wherein main electrolyte lithium salts are lithium hexafluorophosphate, and the concentration of the lithium hexafluorophosphate in the electrolyte is 0.5 to 1.5mol/L; the concentration of the auxiliary electrolyte lithium salts in the electrolyte is 0.005 to 0.5mol/L and the auxiliary electrolyte lithium salts are selected from any one or two or more than two kinds of lithium tetrafluoroborate, lithium bisoxalatoborate, lithium bisfluoroxalatoborate, lithium bis(trifluoromethane sulfonimide) and lithium bis(fluorosulfonyl)imide. According to the electrolyte provided by the invention, the electrolyte lithium salts approximately count for 8 to 15 percent of the total mass percent and are formed by compounding the main electrolyte lithium salts and the auxiliary electrolyte lithium salts; the electrolyte additives are optimized. The lithium titanate lithium ion battery adopting the electrolyte disclosed by the invention has excellent cycle performance, rate performance and high-and-low temperature performance; in addition, an effective interfacial film is formed on a cathode lithium titanate interface, so that the gas expansion phenomenon of the lithium titanate lithium ion battery is greatly relieved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to an electrolyte, more specifically, to an electrolyte for a lithium titanate lithium ion battery. Background technique [0002] Since the 1990s, lithium-ion batteries have been widely used in electronic products due to their high energy density, long cycle life, and environmental friendliness. More demanding electric vehicles and energy storage systems. At present, the cycle performance and safety performance of lithium-ion batteries using carbon materials as negative electrode materials cannot meet the requirements of electric vehicles and energy storage systems. [0003] Spinel lithium titanate (Li 4 Ti 5 o 12 , LTO) material has a theoretical capacity of 175mAh / g between 2.5 and 1.0V, and has excellent reversibility and almost no change in the volume of the material during charge and discharge. At the same time, LTO also has long cycle and high safety performance. Ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0568H01M2300/0017Y02E60/10
Inventor 韩广帅解晶莹罗英张熠霄
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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