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High-voltage electrolyte for lithium ion battery and application of high-voltage electrolyte

A lithium-ion battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of low reversible lithium intercalation, capacity fading, hindering the normal deintercalation of lithium ions, etc., and improve the interface film formation characteristics. , Improve the effect of electrolyte decomposition and high-pressure cycle performance

Inactive Publication Date: 2015-01-14
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

The existence of this layer of film hinders the normal deintercalation of lithium ions. As the number of cycles increases, the amount of reversible lithium intercalation will become less and less, resulting in serious capacity fading.

Method used

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  • High-voltage electrolyte for lithium ion battery and application of high-voltage electrolyte
  • High-voltage electrolyte for lithium ion battery and application of high-voltage electrolyte
  • High-voltage electrolyte for lithium ion battery and application of high-voltage electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In a glove box filled with argon (moisture 2 CF=CHOCFHCF 2 , 1,3-propene sultone, the addition amount accounted for 16% and 4% of the total mass of the electrolyte respectively. Finally, lithium hexafluorophosphate was slowly added to the mixed solution to control its concentration to 1.2M, and the lithium ion battery electrolyte was obtained after stirring evenly, marked as A. At the same time, with 1.2M LiFP 6 It is a lithium salt, the solvent is ethyl methyl carbonate and ethylene carbonate, and the traditional lithium ion electrolyte with a ratio of 7:3 is marked as B.

[0025] The above-mentioned configuration of lithium-ion electrolyte was respectively injected into a button battery with a positive electrode of lithium nickel manganese oxide and a negative electrode of lithium metal, and a 1C charge-discharge cycle was performed within the voltage range of 3.5~4.9V. The lithium-ion electrolytic solution prepared in this example The cyclic voltammetry curves of s...

Embodiment 2

[0027] In an argon-filled glove box (moisture 2 CF=CHOCFHCF 2 , fluoroethylene carbonate, and 1,3-propene sultone, the addition amounts accounted for 15%, 22%, and 3% of the total mass, respectively. Finally, lithium hexafluorophosphate was slowly added to the mixed solution to control its concentration to 1 M, and the lithium ion battery electrolyte was obtained after stirring evenly.

[0028] Inject the configured lithium-ion battery electrolyte into a button battery with a positive electrode of lithium nickel manganese oxide and a negative electrode of lithium metal, and perform a 1C charge-discharge cycle within the voltage range of 3.5~4.9V. The battery charge-discharge cycle is 200 times, and the capacity is retained. The rate reached 98%.

Embodiment 3

[0030]In an argon-filled glove box (moisture 2 CF=CHOCFHCF 2 , fluoroethylene carbonate, 1,3-propene sultone, and vinylene carbonate, the addition amounts accounted for 15%, 23%, 4%, and 1% of the total mass, respectively. Finally, lithium hexafluorophosphate was slowly added to the mixed solution to control its concentration to 1.2M, and the lithium ion battery electrolyte was obtained after stirring evenly.

[0031] Inject the configured lithium-ion electrolyte into a button battery with a positive electrode of lithium nickel manganese oxide and a negative electrode of lithium metal, and perform a 1C charge-discharge cycle within the voltage range of 3.5~4.9V. The battery charge-discharge cycle is 200 times, and the capacity retention rate Reached 97%.

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Abstract

The invention discloses a high-voltage electrolyte for a lithium ion battery and an application of the high-voltage electrolyte. The high-voltage electrolyte is prepared from the following components including a non-aqueous solvent, lithium salts, a first kind of additive and a second kind of additive, wherein the non-aqueous solvent is a carbonate solvent; the first kind of additive contains fluoro alkenyl ether, and a chemical formula of the first kind of additive is as follows: CHF2CF=CHOCFHCF3; the second kind of additive is one or a mixture of the following components of 1,3-lactone allylsulfonate, 1,4-lactone butene sulfonate and vinylene carbonate. Matched with a lithium nickel manganese oxide material, the lithium ion electrolyte provided by the invention is capable of meeting the requirement of recycling of the lithium ion battery under a high voltage condition, so that the cycling stability of a lithium nickel manganese oxide battery under the high voltage condition is excellent.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolytes, and relates to a lithium-ion battery electrolyte, and more specifically, to a lithium-ion battery electrolyte capable of being used for high voltage and improving battery electrochemical performance and a preparation method thereof. Background technique [0002] As an energy storage technology that can be repeatedly charged and discharged, lithium-ion batteries have achieved very important and successful applications in the past 20 years, especially as a power source for various mobile electronic devices, which has promoted the development of communication, electronics and other industries. Flourish. [0003] For now, there are two basic routes for the development of lithium-ion batteries, one is large power batteries, and the other is small batteries in the 3C field. Regardless of the field, with the improvement of living standards, lithium-ion batteries are required to...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0566
CPCH01M10/0566H01M10/0567Y02E60/10
Inventor 罗英解晶莹晏莉琴韩广帅冯毅
Owner SHANGHAI POWER ENERGY STORAGE BATTERY SYST ENG TECH
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