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Lithium ion electrolyte containing grafted polysilane additive

An additive and polysilane technology, which is applied in the field of battery electrolyte and lithium battery electrolyte, can solve the problems of insufficient wide-temperature electrolyte rate performance and high-temperature safety performance, and achieve improved impedance phenomenon, high-temperature safety performance, and discharge performance. Effect

Pending Publication Date: 2021-06-01
SHIJIAZHUANG SAN TAI CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous expansion of lithium-ion application fields, people have put forward higher requirements for lithium-ion battery fluid. By designing silane compounds in the electrolyte system, the electrolyte can have a wider working range, but the wide-temperature electrolyte There are still many deficiencies in the rate performance and high temperature safety performance, so the design of lithium-ion battery electrolyte has become one of the hot spots of research and development.

Method used

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  • Lithium ion electrolyte containing grafted polysilane additive
  • Lithium ion electrolyte containing grafted polysilane additive

Examples

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Effect test

Embodiment 1

[0020] Lithium-ion battery wide-temperature electrolyte, including an organic solvent composed of ethylene carbonate, dimethyl carbonate, and diethyl carbonate with a volume ratio of 4:1:5; LiPF with an organic solvent concentration of 1mol / L 6 Lithium salt; an additive that accounts for 1% of the electrolyte mass, and the graft polysilane additive in the additive includes a vinylene carbonate-polymethylhydrogensilane graft polymer with a substitution rate of 0.05 and ethylene carbonate with a substitution rate of 0.6 Ethylene ester-polymethylhydrogensilane graft polymer, the mass ratio of the two is 1:1; the additive also includes trifluoropropyltriethoxysilane accounting for 0.04% of the mass of the grafted polysilane additive.

Embodiment 2

[0022] Lithium-ion battery wide temperature electrolyte, including an organic solvent composed of ethylene carbonate and methyl ethyl carbonate with a volume ratio of 4:6; LiBF with an organic solvent concentration of 1.5mol / L 4 Lithium salt; an additive that accounts for 2% of the mass of the electrolyte, and the grafted polysilane additive in the additive includes a vinylene carbonate-polymethylhydrosilane graft polymer with a substitution rate of 0.1 and ethylene carbonate with a substitution rate of 0.1 Ethylene ester-polymethylhydrogensilane graft polymer, the mass ratio of the two is 1:3; the additive also includes trifluoropropyltriethoxysilane accounting for 0.1% of the mass of the grafted polysilane additive.

Embodiment 3

[0024] Lithium-ion battery wide-temperature electrolyte, including an organic solvent composed of ethylene carbonate, dimethyl carbonate, and diethyl carbonate with a volume ratio of 3:3:4; Li(CF) with an organic solvent concentration of 1.1mol / L 3 SO 2 )N 2 Lithium salt; an additive that accounts for 1% of the mass of the electrolyte, and the grafted polysilane additive in the additive includes a vinylene carbonate-polymethylhydrosilane graft polymer with a substitution rate of 0.05 and ethylene carbonate with a substitution rate of 0.5 Ethylene ester-polymethylhydrogensilane graft polymer, the mass ratio of the two is 1:3; the additive also includes trifluoropropyltriethoxysilane accounting for 0.1% of the mass of the grafted polysilane additive.

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Abstract

The invention discloses a wide-temperature electrolyte for a lithium ion battery, which belongs to the technical field of lithium battery electrolytes, and comprises a lithium salt, an organic solvent and an additive, wherein the additive comprises a grafted polysilane additive and trifluoropropyltriethoxysilane, the use amount of the additive accounts for 1-2% of the mass of the electrolyte, the grafted polysilane additives comprise one or a combination of two as described in the specification, X is more than 0 and less than or equal to 0.6, n is equal to 18-22, and trifluoropropyltriethoxysilane accounts for 0.04-0.1% of the mass of the grafted polysilane additives. Due to the addition of the substances, the battery electrolyte can effectively improve the rate capability and high-temperature safety performance of a lithium battery and prolong the cycle life of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium battery electrolytes, and relates to a lithium ion electrolyte containing a grafted polysilane additive, in particular to a battery electrolyte with excellent rate performance and safety performance. Background technique [0002] Lithium battery electrolyte is the carrier of ion transmission in the battery, and it is responsible for the transmission of ions between the positive and negative electrodes through the interior of the battery, which is the guarantee for the high performance of the battery. With the continuous expansion of lithium-ion application fields, people put forward higher requirements for lithium-ion battery fluid. By designing silane compounds in the electrolyte system, the electrolyte can have a wider working range, but the wide-temperature electrolyte There are still many deficiencies in the rate performance and high-temperature safety performance of lithium-ion batteries, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 张民刘鹏张茜葛建民闫彩桥王军郝俊杨世雄闫鹏飞彭鹏鹏
Owner SHIJIAZHUANG SAN TAI CHEM CO LTD
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