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Method for in situ preparing of all-solid-state electrolyte

An in-situ preparation and electrolyte technology, applied in composite electrolytes, nanotechnology for materials and surface science, circuits, etc., can solve problems such as failure to enhance ionic conductivity, easy agglomeration, etc. Good flexibility and the effect of improving ionic conductivity

Inactive Publication Date: 2017-07-11
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanoparticles and polymers are easily agglomerated inside the polymer through simple mechanical mixing, and the effect of enhancing ionic conductivity cannot be achieved.

Method used

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  • Method for in situ preparing of all-solid-state electrolyte
  • Method for in situ preparing of all-solid-state electrolyte
  • Method for in situ preparing of all-solid-state electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 0.75g of PEO to 15ml of anhydrous acetonitrile and stir to form a uniform solution, then add 1mL of deionized water, 60mL of absolute ethanol, 3mL of ammonia water, and 2.3mL of ethyl orthosilicate in sequence, and stir at 20°C for 6h to obtain a uniform solution. of white turbid liquid. The obtained white cloudy liquid was evaporated to dryness by a rotary evaporator. Add 15ml of anhydrous acetonitrile, magnetically stir until a uniform white turbid liquid is added, then add 0.165g LiBOB and stir for 24 hours, then pour it into a polytetrafluoroethylene container, and evaporate the solvent in a vacuum oven at 40°C to obtain a uniform film. The membrane was placed in the glove box for 48h to obtain the final solid electrolyte.

[0033] The morphology of the solid electrolyte prepared in situ in this example was tested, figure 1 It is a SEM picture, it can be seen from the picture that SiO 2 The nanoparticles are relatively uniformly distributed in the PEO framewo...

Embodiment 2

[0037]Add 0.75g of PEO to 15ml of anhydrous acetonitrile and stir to form a uniform solution, then add 1mL of deionized water, 60mL of absolute ethanol, 3mL of ammonia water, 0.5mL of ethyl orthosilicate, and stir at 20°C for 6h to obtain a uniform solution. of white turbid liquid. The obtained white cloudy liquid was evaporated to dryness by a rotary evaporator. Add 15ml of anhydrous acetonitrile, stir magnetically until a uniform white turbid liquid is obtained, then add 0.165g LiBOB and stir for 24 hours, then pour it into a polytetrafluoroethylene container, evaporate the solvent to dryness in a vacuum oven at 40°C to obtain a uniform film, and then The final solid electrolyte was obtained by placing the film in the glove box for 48 hours.

[0038] The morphology of the solid electrolyte prepared in situ in this example was tested, and it can be seen from the SEM image that SiO 2 Nanoparticles are relatively uniformly distributed in the PEO framework, and we also measure...

Embodiment 3

[0041] Add 0.75g of PEO to 15ml of anhydrous acetonitrile and stir to form a homogeneous solution, then add 1mL of deionized water, 60mL of absolute ethanol, 3mL of ammonia water, 1mL of ethyl orthosilicate, and stir at 20°C for 6h to obtain a uniform solution. White cloudy liquid. The obtained white cloudy liquid was evaporated to dryness by a rotary evaporator. Add 15ml of anhydrous acetonitrile, stir magnetically until a uniform white turbid liquid is obtained, then add 0.165g LiBOB and stir for 24 hours, then pour it into a polytetrafluoroethylene container, evaporate the solvent to dryness in a vacuum oven at 40°C to obtain a uniform film, and then The final solid electrolyte was obtained by placing the film in the glove box for 48 hours.

[0042] The morphology of the solid electrolyte prepared in situ in this example was tested, and it can be seen from the SEM image that SiO 2 Nanoparticles are relatively uniformly distributed in the PEO framework, and we also measure...

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Abstract

The invention discloses an all-solid-state electrolyte and an in situ preparation method and application thereof, and belongs to the field of all-solid-state electrolytes. The in situ preparation method is simple without involving of any high-risk operations. The all-solid-state electrolyte is characterized in that: SiO2nanoparticles are evenly distributed in a polyethylene oxide skeleton, large anion lithium salt LiBOB is loaded in the skeleton, crystallization kinetics of polyethylene oxide can be effectively inhibited, polymer ionic conductivity is greatly improved, and meanwhile in situ composite SiO2 enhances the mechanical properties of the solid electrolyte. When the all-solid-state electrolyte is used in a lithium secondary battery, better results are obtained. The prepared all-solid-state electrolyte has the advantages of simple process and easy enlarged production, can inhibit lithium dendrite generation, can eliminate flammable and explosive safety hazards, greatly improves the energy density, and provides a solid foundation for commercialization of all-solid-state lithium secondary batteries.

Description

technical field [0001] The invention belongs to the technical field of solid-state electrolytes, and relates to a method for all-solid-state electrolytes in which nanoparticles are in-situ grown in polymer skeletons. The prepared solid electrolyte can greatly improve the ionic conductivity, and at the same time has good flexibility, which greatly improves the cycle stability and safety of lithium secondary batteries, and plays an important role in the field of battery energy storage. Background technique [0002] As a new energy storage device, lithium secondary batteries have greatly promoted the development of electric vehicles due to their environmental friendliness and long service life. In order to increase the cruising range of electric vehicles and better bring convenience to people's life and work. It is very necessary for us to commercialize some high energy density materials, such as silicon, lithium, sulfide and other negative electrode materials. However, a ser...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M10/0525H01M10/056H01M2300/0088Y02E60/10
Inventor 张景萍黄科程李欢欢刘丝雨吴兴隆
Owner NORTHEAST NORMAL UNIVERSITY
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