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Lithium ion battery interlayer solid-state electrolyte and a preparation method thereof

A solid-state electrolyte, lithium-ion battery technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of poor interface performance and low conductivity of all-solid-state electrolytes, achieve soft interface contact, simple preparation process, and environmental friendliness Effect

Inactive Publication Date: 2019-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the technical problems of poor interface performance and low conductivity of existing all-solid electrolytes, and provides a lithium-ion battery interlayer solid electrolyte and a preparation method thereof

Method used

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  • Lithium ion battery interlayer solid-state electrolyte and a preparation method thereof
  • Lithium ion battery interlayer solid-state electrolyte and a preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] (1) Take 1.5g of PAN powder and add it to the DMF solvent to make a mixed solution with a mass fraction of 15% of PAN, add LLZO nanoparticles with a mass fraction of 20% (relative to the interlayer solid electrolyte of lithium-ion batteries), and stir with a magnetic stirrer 6h to make it fully dispersed to obtain a uniform spinning precursor solution; under the conditions of an injection speed of 1.2ml / h, a spinning voltage of 25kv, a spinning distance of 18cm, and a roller receiving (roller speed 500r / min) Electrospinning is performed; after spinning, the electrospun film is put into an oven, and dried at 80° C. for 12 hours to completely evaporate the solvent. The obtained film is standby;

[0032] (2) Take 1g PAN, 0.6g LiTFSI and put them into 15ml NMP and stir them fully at 45°C for 9h, then pour them into a polytetrafluoroethylene mold. The drying time is 24h in the argon atmosphere in the glove box, and 24h in vacuum at 35°C. Obtain the polymer electrolyte membr...

Embodiment 2

[0036] (1) Take 1.5g of PAN powder and add it to the DMF solvent to make a mixed solution with a mass fraction of 15% of PAN, then add LLZO nanoparticles with a mass fraction of 10% (relative to the interlayer solid electrolyte of lithium-ion batteries), and use a magnetic stirrer Stir for 6 hours to make it fully dispersed to obtain a uniform spinning precursor solution; at an injection speed of 1.2 ml / h, a spinning voltage of 10kv, and a spinning distance of 10cm, the conditions of using a roller to receive (roller speed 500r / min) After the spinning, the electrospun film was placed in an oven, and dried at 40° C. for 6 hours to completely evaporate the solvent. The obtained film is standby;

[0037] (2) Take 1g PAN, 0.3g LiTFSI and put them into 15ml NMP and stir them well at 30°C for 6h, then pour them into a polytetrafluoroethylene mold. The drying time is 6h in argon atmosphere in the glove box, and 6h in vacuum at 20°C. Obtain the polymer electrolyte membrane for subseq...

Embodiment 3

[0041](1) Take 1.5g of PAN powder and add it to the DMF solvent to make a mixed solution with a mass fraction of 15% of PAN, add LLZO nanoparticles with a mass fraction of 30% (relative to the interlayer solid electrolyte of lithium-ion batteries), and stir with a magnetic stirrer 6h to make it fully dispersed to obtain a uniform spinning precursor solution; under the conditions of an injection speed of 1.2 ml / h, a spinning voltage of 18kv, a spinning distance of 14cm, and a roller receiving (roller speed 500r / min) Electrospinning is carried out; after spinning, the electrospun film is put into an oven, and dried at 60°C for 9 hours to completely evaporate the solvent. The obtained film is standby;

[0042] (2) Take 1g PAN, 0.1g LITFSI and put them into 15ml NMP and stir well at 60°C for 12h, then pour them into a polytetrafluoroethylene mold, and dry them in a glove box for 15h under argon atmosphere, and 15h under vacuum at 50°C Obtain the polymer electrolyte membrane for s...

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Abstract

The invention discloses a lithium ion battery interlayer solid-state electrolyte and a preparation method thereof, belonging to the technical field of lithium ion battery electrolyte. The preparationmethod comprises the following steps: (1) evenly mixing inorganic solid electrolyte with electrostatic spinning precursor solution, preparing a polymer matrix doped with inorganic solid electrolyte byelectrostatic spinning, and obtaining a composite substrate after vacuum drying; (2) dissolving lithium salt in solvent, adding polymer electrolyte, stirring and reacting to obtain polymer solution,and pouring and drying the polymer solution to obtain a polymer electrolyte membrane; and (3) clamping the polymer electrolyte membrane obtained in step (2) to the two sides of the composite substrateobtained in step (1), and carrying out hot pressing with a hot press to obtain the lithium ion battery interlayer solid-state electrolyte. By using the electrolyte prepared by the method of the invention, the conductivity is improved, and the interface performance of all-solid-state electrolyte is optimized.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery solid electrolytes, in particular to a lithium-ion battery interlayer solid electrolyte and a preparation method thereof. Background technique [0002] Power batteries are the core components of new energy vehicles, and the first choice is lithium-ion batteries with high energy density and power density. However, due to the use of organic liquid electrolytes in current commercial lithium-ion batteries, there are safety hazards such as leakage, flammability and volatility. At the same time, the energy density of liquid lithium batteries is close to the upper limit. Therefore, the use of solid electrolyte is expected to improve the safety performance and energy density of power batteries. [0003] Solid electrolytes are mainly divided into two categories: inorganic solid electrolytes and polymer solid electrolytes. Inorganic solid electrolytes have high ionic conductivity at room tempe...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/0525
CPCY02E60/10
Inventor 王海辉韩庆月王素清蒋周阳姚翔黄玉平
Owner SOUTH CHINA UNIV OF TECH
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