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High voltage electrolyte for lithium ion batteries

A lithium-ion battery and electrolyte technology, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor solubility and high viscosity of fluorinated solvents, and achieve high-voltage resistance, good oxidation resistance and high-voltage resistance. Effect of wide electrochemical window

Active Publication Date: 2015-01-14
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a high-voltage electrolyte solution for lithium-ion batteries, which effectively solves the problems of high viscosity of fluorinated solvents and poor solubility of electrolyte lithium salts in fluorinated organic solvents, so that fluorinated organic solvents can be directly used as lithium The organic solvent in the electrolyte of the ion battery is used, and the present invention has a wide electrochemical window, good oxidation resistance and high pressure resistance, and has a high electrical conductivity, which can ensure the high rate and power characteristics of the power battery. It also has high safety and can greatly improve the safety performance of power batteries

Method used

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Embodiment 1

[0028] Mix fluoroethylene carbonate, trifluoropropylene carbonate, hydrofluoroether, lithium hexafluorophosphate, lithium bisoxalate borate and propylene sulfite according to the ratio to obtain a high-pressure electrolyte. Among them, fluoroethylene carbonate: trifluoro The volume ratio of propylene carbonate: hydrofluoroether is 2:4:1, the molar concentration of lithium hexafluorophosphate is 0.8 mol / L, the molar concentration of lithium bisoxalate borate is 0.1 mol / L, and the addition amount of propylene sulfite is 1%.

[0029]

Embodiment 2

[0031] Mix fluoroethylene carbonate, trifluoropropylene carbonate, hydrofluoroether, lithium hexafluorophosphate, lithium bisoxalate borate and propylene sulfite according to the ratio to obtain a high-pressure electrolyte. Among them, fluoroethylene carbonate: trifluoro The volume ratio of propylene carbonate: hydrofluoroether is 5:10:4, the molar concentration of lithium hexafluorophosphate is 1 mol / L, the molar concentration of lithium bisoxalate borate is 0.15 mol / L, and the addition amount of propylene sulfite is 1.5%.

[0032]

Embodiment 3

[0034] Mix fluoroethylene carbonate, trifluoropropylene carbonate, hydrofluoroether, lithium hexafluorophosphate, lithium bisoxalate borate and propylene sulfite according to the ratio to obtain a high-pressure electrolyte. Among them, fluoroethylene carbonate: trifluoro The volume ratio of propylene carbonate: hydrofluoroether is 3:7:3, the molar concentration of lithium hexafluorophosphate is 1.2 mol / L, the molar concentration of lithium bisoxalate is 0.2 mol / L, and the addition amount of propylene sulfite is 2%.

[0035]

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Abstract

The invention discloses a high voltage electrolyte for lithium ion batteries, the high voltage electrolyte is composed of an organic solvent, electrolyte lithium salt and a cathode film-forming additive, wherein the organic solvent is a mixed solvent of fluorinated ethylene carbonate, trifluorinated propylene carbonate and hydrofluoroether, the electrolyte lithium salt mixed is lithium salt of lithium hexafluorophosphate and lithium bis(oxalate)borate. The high voltage electrolyte effectively solves the problems that fluorinated solvents are high in viscosity and the electrolyte lithium salt is poor in solubility in fluorinated organic solvents, so that the fluorinated organic solvents can be directly used as the organic solvents in lithium ion battery electrolyte, the high voltage electrolyte has wide electrochemical window and good oxidation resistance and high voltage resistant characteristics, has high electric conductivity, can guarantee the high magnification and power characteristics of a power battery, is high in safety, and can greatly improve the safety performance of the power battery.

Description

Technical field [0001] The invention relates to an electrolyte for a lithium ion battery, in particular to a high voltage electrolyte for a lithium ion battery. [0002] Background technique [0003] Lithium-ion battery cathode materials such as lithium cobalt oxide (LiCoO 2 ), lithium iron phosphate (LiFePO 4 ) And lithium manganate (LiMn 2 O 4 ) Operating voltage is lower than 4V, and lithium nickel manganate (LiNi 0.5 Mn 1.5 O 4 ) And lithium cobalt phosphate (LiCoPO 4 The discharge voltage of new high-voltage cathode materials represented by materials such as) can be as high as about 5V. The use of these high-voltage materials in lithium-ion batteries can increase the output voltage and power density of the batteries, and further broaden the use of lithium-ion batteries in high-power electrical equipment. The scope of application has attracted wide attention from researchers in the industry. [0004] However, there is currently no electrolyte compatible with high-voltage materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0566H01M10/0569H01M10/0568
CPCH01M10/0525H01M10/056Y02E60/10
Inventor 严红
Owner WANXIANG 123 CO LTD
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