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 incre

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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Example Embodiment

[0023] Example 1

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

[0025] Inject the lithium ion electrolyte of the above configuration into a button cell with lithium nickel manganate as the positive electrode and lithium metal as the negative electrode, and perform a 1C charge and discharge cycle in the voltage range of 3.5 to 4.9V. The lithium ion electrolysis prepared in this example The cyclic voltammetry curves of solution A and traditional lithium ion electrolyte B are as ...

Example Embodiment

[0026] Example 2

[0027] In a glove box filled with argon (moisture 2 CF=CHOCFHCF 2 , Fluorinated ethylene carbonate, 1,3-propene sultone, the added amount accounted for 15%, 22%, 3% of the total mass respectively. Finally, slowly add lithium hexafluorophosphate to the mixed solution, control its concentration to 1 M, and stir evenly to obtain the lithium ion battery electrolyte.

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

Example Embodiment

[0029] Example 3

[0030] In a glove box filled with argon (moisture 2 CF=CHOCFHCF 2 , Fluorinated ethylene carbonate, 1,3-propene sultone, and vinylene carbonate are added in 15%, 23%, 4%, and 1% of the total mass. Finally, slowly add lithium hexafluorophosphate to the mixed solution, control its concentration to 1.2M, and stir evenly to obtain the lithium ion battery electrolyte.

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