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Nonaqueous electrolyte and lithium ion battery using same

A non-aqueous electrolyte and non-aqueous technology, which is applied in the field of lithium-ion batteries, can solve the problems of loose solid electrolyte membrane, instability, and high reduction potential, and achieve the effects of inhibiting reduction decomposition, improving cycle performance, and improving safety performance

Active Publication Date: 2016-04-13
NINGDE AMPEREX TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Studies have shown that phosphate ester compounds have a good flame retardant effect, and use as a lithium-ion battery solvent can improve the safety performance of the battery, such as Impact, nail, but due to its high reduction potential and the formation of a solid electrolyte membrane (SEI) loose And unstable, obviously affect the cycle performance of the battery

Method used

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  • Nonaqueous electrolyte and lithium ion battery using same
  • Nonaqueous electrolyte and lithium ion battery using same
  • Nonaqueous electrolyte and lithium ion battery using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～9

[0084] The preparation of embodiment 1~9 electrolyte

[0085] Embodiment 1~9 electrolyte is prepared according to the following method:

[0086] In the drying room, after mixing EC, PC and DEC, add lithium salt, then add phosphonic acid cyclic anhydride compound and phosphoric acid ester compound, mix well, and obtain electrolyte solution, wherein, the addition amount of EC, PC and DEC is such that EC , PC and DEC weight ratio are EC:PC:DEC=1:1:3, the addition amount of lithium salt is to make LiPF 6 The molar concentration in the electrolyte is 1mol / L.

[0087] Preparation of lithium-ion batteries:

[0088] 1) Preparation of the positive electrode sheet: the positive electrode active material lithium cobaltate (molecular formula is LiCoO 2 ), the conductive agent acetylene black, and the binder polyvinylidene fluoride (abbreviated as PVDF) are fully stirred and mixed in an appropriate amount of N-methylpyrrolidone (abbreviated as NMP) solvent in a weight ratio of 96:2:2 to...

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a nonaqueous electrolyte and a lithium ion battery using the same. The nonaqueous electrolyte is prepared from nanaqueous organic solvent, lithium salt and an additive, wherein the nonaqueous organic solvent contains at least one phosphate ester compound, and the additive contains at least one phosphonic acid cyclic anhydride compound. Due to the fact that the phosphonic acid cyclic anhydride compound has the higher reduction potential, stable SEI can be formed at the anode, reductive decomposition of phosphate ester is inhibited, and the cycling performance of the battery is improved. According to the electrolyte, by using the phosphate ester compound and the phosphonic acid cyclic anhydride compound in a combined mode, the safety performance of the battery is significantly improved, and meanwhile the cycling performance of the battery is not influenced.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a nonaqueous electrolytic solution and a lithium ion battery using the nonaqueous electrolytic solution. Background technique [0002] Lithium-ion batteries are widely used in consumer electronics products, energy storage and power batteries due to their advantages such as high specific energy, long cycle life, and small self-discharge. With the widespread application of lithium-ion batteries, the specific energy density of batteries is getting higher and higher, and the safety performance of batteries needs to be improved urgently. [0003] Studies have shown that phosphate ester compounds have a good flame retardant effect, and use as a lithium-ion battery solvent can improve the safety performance of the battery, such as Impact, nail, but due to its high reduction potential and the formation of a solid electrolyte membrane (SEI) loose And unstable, obviously a...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0569H01M2300/0028Y02E60/10
Inventor 龙兵
Owner NINGDE AMPEREX TECH
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