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High voltage electrolyte for lithium ion battery

A lithium-ion battery, electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as shortening battery life, battery structure changes, and difficulty meeting requirements

Inactive Publication Date: 2016-05-18
SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional LiPF6 / carbonate electrolyte system generally has an anti-oxidative decomposition potential below 4.35V. If the organic solvent in the electrolyte exceeds 4.35V, it will oxidize and decompose, and the gas will cause the battery to bulge, causing changes in the internal structure of the battery, and greatly shortening the battery life. At the same time, there are battery safety hazards, and it is difficult to meet the requirements of lithium-ion batteries made of high-potential materials.

Method used

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  • High voltage electrolyte for lithium ion battery
  • High voltage electrolyte for lithium ion battery
  • High voltage electrolyte for lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Weigh fluoroethylene carbonate, methyl-2,2,2-trifluoroethyl carbonate, and ethyl methyl carbonate at a mass ratio of 4:1:15 to form an organic mixture; add N-butylene to the mixture in turn Base, methylpyrrolidine (trifluoromethylsulfonyl) imide salt, vinylene carbonate, which account for 2% and 1.5% of the total mass respectively; finally slowly add 1M / L lithium hexafluorophosphate and stir to obtain the mixture of Example 1 Li-ion battery high voltage electrolyte. The electrolytic solution has an oxidation potential of 4.9-5.0V measured on a metal platinum electrode by using a three-electrode system.

Embodiment 2

[0025] Weigh fluoroethylene carbonate, ethyl methyl carbonate, and γ-butyrolactone in a mass ratio of 2:7:1 to form an organic mixture; add N-butyl, methylpyrrolidine (trifluoromethyl) to the mixture in turn Sulfonyl)imide salt, vinylene carbonate, which account for 2% and 1% of the total mass respectively; finally slowly add 0.9M / L lithium hexafluorophosphate and 0.1M / L lithium bisoxalate borate and stir to obtain the product of Example 2 Li-ion battery high voltage electrolyte. The electrolytic solution adopts a three-electrode system to measure the oxidation potential on the metal platinum electrode to be 5.0V.

Embodiment 3

[0027] Weigh fluoroethylene carbonate and ethyl methyl carbonate to make an organic mixture according to the mass ratio of 1:4; add N-butyl, methylpiperidinium (trifluoromethylsulfonyl) imide salt to the mixture in turn , vinylene carbonate, vinyl sulfite, which account for 2%, 1% and 0.5% of the total mass respectively; finally slowly add 0.9M / L lithium hexafluorophosphate and 0.1M / L bis(trifluoromethylsulfonyl)imide After stirring the lithium evenly, the high-voltage electrolyte solution for the lithium-ion battery of Example 3 was obtained. The electrolytic solution adopts a three-electrode system to measure the oxidation potential on the metal platinum electrode to be 4.95V.

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Abstract

The invention belongs to the field of lithium ion battery electrolyte technology, and provides high voltage electrolyte for a lithium ion battery. The high voltage electrolyte comprises lithium salt, an organic solvent and an additive; and the high voltage electrolyte is characterized in that the organic solvent comprises fluoroester and a common carbonic ester organic solvent, wherein the organic solvent comprises 5-30% of the fluoroester by mass; the additive comprises ionic liquid and an film forming additive, and the mass percentage content is 0.01-8%. The high voltage electrolyte can enhance oxidative decomposition potential of the electrolyte, prolong cycle life of the lithium ion battery, and solve gas expansion and other problems of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of new energy lithium-ion battery materials, and in particular relates to a functional electrolyte for high-voltage lithium-ion batteries. Background technique [0002] With the continuous development and application of lithium-ion battery technology, traditional lead-acid and nickel-cadmium batteries are gradually being replaced. In particular, the development of electric vehicles and hybrid electric vehicles has further accelerated the marketization of lithium-ion batteries, and at the same time put forward higher requirements for lithium-ion batteries. Lithium-ion batteries with high energy density and power density have become the main direction of next-generation lithium-ion batteries. [0003] In order to improve the energy density of lithium-ion batteries, some positive electrode materials with high potential, such as LiNi0.5Mn1.5O4, LiMPO4 (M=Co, Ni), etc., have attracted more and more attention fro...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569
CPCY02E60/10
Inventor 车海英马紫峰
Owner SHANGHAI SINOPOLY JIAHUA BATTERY TECH
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