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Grafted polysilane compound, preparation method and application of grafted polysilane compound in battery electrolyte

A technology of polysilane and compound, which is applied in the application field of grafted polysilane compounds and battery electrolyte, can solve the problems of adverse effects on the performance of electrolyte at low temperature, difficult synthesis process, high cost of electrolyte, etc. Discharge cycle stability, good solubility, and easy preparation

Active Publication Date: 2015-03-25
NAT UNIV OF DEFENSE TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium salt stabilizers, anti-overshooting agents, flame retardants, etc. are usually added, but these components usually have a high freezing point and high viscosity, which will adversely affect the low-temperature performance of the electrolyte
At the same time, the molecular structure is relatively complex, and the synthesis process is difficult; at the same time, the solvent used in the new electrolyte system is large, which may cause high electrolyte costs.

Method used

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  • Grafted polysilane compound, preparation method and application of grafted polysilane compound in battery electrolyte
  • Grafted polysilane compound, preparation method and application of grafted polysilane compound in battery electrolyte
  • Grafted polysilane compound, preparation method and application of grafted polysilane compound in battery electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A kind of graft polysilane compound PMSVC, its structural formula is as follows:

[0049]

[0050] Among them, the degree of polymerization n is 21; on the grafted group -CH 2 - the number m of chain links is 0; the graft substitution rate x is 8%.

[0051] The synthetic method of grafted polysilane compound PMSVC specifically comprises the following steps:

[0052] (1) Take 0.88g vinylene carbonate (VC) and 4.40g polyhydromethylsilane (PMS) (mass ratio of VC and PMS is 1:10~2:1 can be implemented), dissolve in tetrahydrofuran (THF) Add 0.01g of azobisisobutyronitrile (AIBN), reflux at 60-70°C for 12h, and distill off the solvent under reduced pressure to obtain the grafted polysilane compound PMSVC.

[0053] (2) The grafted polysilane compound PMSVC was added into n-hexane under the protection of Ar atmosphere, and stirred to fully dissolve the reaction product to obtain a mixed solution. An equal amount of methanol was added to the mixture for sedimentation, and...

Embodiment 2

[0061] A kind of graft polysilane compound PMSVEC10, its structural formula is as follows:

[0062]

[0063] Wherein, the degree of polymerization n is 20; -CH 2 -The number m of chain links is 2; the graft substitution rate x is 0.10.

[0064] The synthetic method of graft polysilane compound PMSVEC10 specifically comprises the following steps:

[0065] (1) Take 1.14g ethylene carbonate (VEC) and 4.40g PMS (the mass ratio of VEC and PMS is 1:10~2.5:1, all can be implemented), dissolve in THF, add 0.01g AIBN, at 60 Reflux at ~70°C for 12h, and distill off the solvent under reduced pressure.

[0066] (2) Add n-hexane under the protection of Ar atmosphere, stir to make it fully dissolved. An equal amount of methanol was added for sedimentation, and the supernatant was discarded after centrifugation to obtain a precipitate.

[0067] (3) Add 20mL of dimethyl carbonate DMC (10-50mL can be implemented) to the precipitate and stir well, then filter the solution. join in Mol...

Embodiment 3

[0072] A kind of graft polysilane compound PMSVEC40, its structural formula is as follows:

[0073]

[0074] Wherein, the degree of polymerization n is 20; -CH 2 -The number m of chain links is 2; the graft substitution rate x is 0.37.

[0075] The synthetic method of grafted polysilane compound PMSVEC40 specifically comprises the following steps:

[0076] (1) Take 4.56g VEC and 4.40g PMS (mass ratio of VEC and PMS is 1:10~2.5:1 can be implemented), dissolve in THF, add 0.01g AIBN, reflux at 60~70°C for 12h , and the solvent was distilled off under reduced pressure.

[0077] (2) Add n-hexane under the protection of Ar atmosphere, stir to make it fully dissolved. An equal amount of methanol was added for sedimentation, and the supernatant was discarded after centrifugation to obtain a precipitate.

[0078] (3) Add 20mL of dimethyl carbonate DMC (10-50mL can be implemented) to the precipitate and stir well, then filter the solution. join in Molecular sieves reduce the ...

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PUM

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Abstract

The invention discloses a grafted polysilane compound, a preparation method and an application of the grafted polysilane compound. A chemical structural formula of the grafted polysilane compound can be expressed with the following formula as shown in the specification, wherein the polymerization degree n is 18-23; the quantity m of -CH2- chain links is 0-6; and the grafted replacement rate x is 0-0.8. The invention also provides a preparation method of the grafted polysilane compound. The method comprises the following step: grafting a vinylene carbonate compound on a branch chain of poly-hydrogen methylsilane through hydrosilicenae addition reaction, so as to obtain grafted polysilane. The grafted polysilane compound provided by the invention can be applied to the battery electrolyte as a stabilizer, thus the charge and discharge cycling stability of the battery at a high temperature is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a grafted polysilane compound, a preparation method of the grafted polysilane compound and an application in battery electrolyte. Background technique [0002] The operating temperature range of lithium-ion batteries mainly depends on the performance of the electrolyte, which requires the electrolyte of lithium-ion batteries to have high ionic conductivity, low freezing point, high boiling point, and chemical and electrochemical stability. Currently widely used organic liquid electrolytes still firmly occupy most of the commercial lithium-ion battery market due to their advantages of low cost, high ionic conductivity, and more stable electrochemical performance. [0003] At present, the most widely used electrolyte in commercial lithium-ion batteries is the conductive lithium salt lithium hexafluorophosphate (LiPF 6 ) is dissolved in a binary or ternary mixed solve...

Claims

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Application Information

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IPC IPC(8): C08G77/60H01M10/0567
CPCY02E60/10
Inventor 郑春满李山河芦伟谢凯盘毅韩喻王珲洪晓斌
Owner NAT UNIV OF DEFENSE TECH
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