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Preparation method and application of a modified polysiloxane-based solid electrolyte membrane

A solid electrolyte membrane and polysiloxane-based technology, which is applied in the direction of solid electrolyte, electrolyte storage battery manufacturing, non-aqueous electrolyte, etc., can solve the problems of narrow electrochemical window and low ion conductivity, and achieve good mobility and low glass The effect of changing the transition temperature and broadening the range of application fields

Active Publication Date: 2020-04-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low ionic conductivity and narrow electrochemical window at room temperature in existing all-solid polymer electrolytes

Method used

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  • Preparation method and application of a modified polysiloxane-based solid electrolyte membrane
  • Preparation method and application of a modified polysiloxane-based solid electrolyte membrane
  • Preparation method and application of a modified polysiloxane-based solid electrolyte membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1P

[0026] The synthesis of implementation example 1PEO modified PMHS

[0027] A certain amount of PMHS was weighed and mixed with an appropriate amount of anhydrous toluene into a 50ml three-necked flask, and then placed in an oil bath and heated and stirred. Appropriate amount of PEO(m (PEO) :m (PHMS) =2), an appropriate amount of chloroplatinic acid catalyst was dissolved and mixed in anhydrous toluene, and then slowly added into a three-necked flask. in N 2 Under a protective atmosphere, the mixed solution was first reacted at 50°C for 2-4 hours, and then heated to 80°C to react until the carbon-carbon double bond in the mixed solution disappeared (infrared verification), and the product was washed with n-hexane to remove impurities, and then distilled under reduced pressure The solvent was removed to obtain a PEO-grafted PMHS backbone polymer (P-PMHS).

Embodiment 2

[0028] The preparation of implementation example 2 polymer lithium ion batteries

[0029] (1) Put the P-PMHS polymer prepared in Example 1 into a 100ml round bottom flask, add an appropriate amount of anhydrous acetonitrile solvent, and stir to dissolve. Subsequently, an appropriate amount of chloroplatinic acid catalyst, triethylene glycol divinyl ether crosslinking agent, bistrifluoromethylsulfonylimide lithium (adding lithium salt amount to meet [EO]:[Li + ]=20:1) into the round bottom flask, stirred at room temperature for 12h, and mixed well.

[0030] (2) Pour the mixed solution of (1) into a polytetrafluoroethylene mold, place it in a vacuum oven, heat and cross-link and solidify to obtain a solid polymer electrolyte membrane, and transfer it to a glove box for standby.

[0031] (3) LiFePO 4 The positive electrode material, PVDF, and conductive carbon black are mixed according to the mass ratio of 80:10:10, and an appropriate amount of NMP is added to stir evenly, and ...

Embodiment 3

[0033] The preparation of implementation example 3 polymer lithium ion batteries

[0034] (1) Weigh a certain amount of PMHS and mix them with an appropriate amount of anhydrous toluene and add them into a 50ml three-neck flask, then heat and stir in an oil bath. Appropriate amount of PEO(m (PEO) :m (PHMS)=2), cyanoimidazolium ionic liquid (10wt% PMHS) and an appropriate amount of chloroplatinic acid catalyst were dissolved in anhydrous toluene and mixed, then slowly added into a three-necked flask. in N 2 Under a protective atmosphere, the mixed solution was first reacted at 50°C for 2-4 hours, and then heated to 80°C to react until the carbon-carbon double bond in the mixed solution disappeared (infrared verification), and the product was washed with n-hexane to remove impurities, and then distilled under reduced pressure Removal of solvent yielded IL-CN and PEO double-grafted PMHS polymer (PIN-PMHS).

[0035] (2) Put the PIN-PMHS polymer prepared in (1) in a 100ml round...

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Abstract

The invention discloses a preparation method and application of a modified polysiloxane-based solid electrolyte membrane (SPE). In the present invention, SPE is made of poly(methylhydrogensilane) (PMHS), cyanoimidazolium ionic liquid (IL-CN), allyl-terminated polyether (PEO), lithium salt and crosslinking agent. The preparation method of the present invention is as follows: 1, PMHS, PEO, IL-CN are fully mixed in anhydrous toluene, add chloroplatinic acid catalyst, react for an appropriate time at a certain temperature; 2, the product in step 1 is dissolved in anhydrous acetonitrile Mix an appropriate amount of lithium salt, cross-linking agent and catalyst into the mixture, pour the solution into a polytetrafluoroethylene mold after stirring well, heat and cross-link and solidify in a vacuum oven, and obtain an all-solid polymer electrolyte membrane. The obtained electrolyte has high electrical conductivity, wide electrochemical stability window and high stability, and can be used in lithium secondary batteries.

Description

technical field [0001] The invention relates to a preparation method and application of a modified polysiloxane-based solid electrolyte membrane. Background technique [0002] With the advancement of science and technology, people have entered the digital information age, and portable smart digital products are developing rapidly. Correspondingly, energy storage has become a very important scientific and technological topic. The emergence and development of lithium-ion batteries not only solve the energy storage problem of mobile digital devices to a large extent, but also promote the industrial development of digital products. For example, smartphones, laptops, audio equipment, game consoles, digital cameras, PDAs, etc. On the other hand, oil resources are depleting day by day, automobile exhaust has increasingly significant impact on the ecological environment, and people's awareness of environmental protection is constantly increasing. This makes lithium-ion secondary ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0565C08G77/46
CPCC08G77/46H01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 张庆华刘明珠詹晓力陈丰秋
Owner ZHEJIANG UNIV
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