Preparation and application of ultrathin organic-inorganic composite solid electrolyte membrane

A technology of solid electrolyte membrane and solid electrolyte, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of unmatched positive electrode materials, low battery power density, narrow electrochemical window, etc., and achieve good electrochemical performance, good Flexibility and machinability, effects of high room temperature ionic conductivity

Pending Publication Date: 2022-08-02
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In thin-film all-solid-state batteries, limited by the low ionic conductivity of solid-state electrolytes, narrow electrochemical windows, and serious interface problems between electrolytes and electrode materials, all-solid-state batteries cannot match high-voltage positive electrode materials, and the cycle performance is poor. Poor, the power density of the battery is low, and its application is limited to a certain extent

Method used

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  • Preparation and application of ultrathin organic-inorganic composite solid electrolyte membrane
  • Preparation and application of ultrathin organic-inorganic composite solid electrolyte membrane
  • Preparation and application of ultrathin organic-inorganic composite solid electrolyte membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] First, 1 g of polyvinylidene fluoride (PVDF) was dispersed and dissolved in NMP organic solvent, fully stirred and completely dissolved, and the same amount of garnet-type Li as PVDF was added. 6.6 La 2.9 Ca 0.1 Zr 1.75 W 0.25 O 12The solid electrolyte nanoparticles were vigorously stirred for 12h and sonicated for 2h to obtain a slurry with uniform particle dispersion. An ultra-thin composite electrolyte base film was prepared by the casting method to obtain a thin film electrolyte base film; then polyethylene ethylene carbonate with high ionic conductivity was selected. The electrolyte precursor solution (ethylene ethylene carbonate (76%) + LiTFSI (23.99%) + azobisisobutyronitrile (0.01%)) was poured into the thin-film electrolyte base membrane by solution casting, and the High temperature curing yields ultrathin organic-inorganic composite electrolyte membranes with excellent properties.

Embodiment 2

[0027] First, 1 g of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) was dispersed and dissolved in NMP organic solvent, fully stirred and completely dissolved, and the same amount of garnet-type Li as PVDF-HFP was added. 6.6 La 2.9 Ca 0.1 Zr 1.75 W 0.25 O 12 The solid electrolyte nanoparticles were vigorously stirred for 12 hours and ultrasonicated for 2 hours to obtain a slurry with uniform particle dispersion. The ultra-thin composite electrolyte base film was prepared by the casting method to obtain a thin film electrolyte base film; then a high-ionic polyethylene carbonate electrolyte precursor solution was selected. (ethylene ethylene carbonate (76%) + LiTFSI (23.99%) + azobisisobutyronitrile (0.01%)), poured into the thin film electrolyte base membrane by solution casting method, and cured at 80 °C to obtain a Ultrathin organic-inorganic composite electrolyte membrane with excellent performance.

Embodiment 3

[0029] First, 1 g of polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) was dispersed and dissolved in NMP organic solvent, fully stirred and completely dissolved, and the same amount of silica nanoparticles as PVDF-HFP was added, stirred vigorously for 12 hours, and ultrasonicated for 2 hours to obtain particles The uniformly dispersed slurry was prepared by casting method to obtain an ultra-thin composite electrolyte base film to obtain a thin film electrolyte base film; Polyethylene carbonate electrolyte precursor solution (ethylene ethylene carbonate (76%) + LiTFSI (23.99%) + azobisisobutyronitrile (0.01%)), poured into the thin-film electrolyte base membrane by solution casting method, and cured at high temperature to obtain an ultra-thin organic-inorganic composite electrolyte membrane with excellent performance.

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Abstract

The invention discloses preparation and application of an ultrathin organic-inorganic composite solid electrolyte membrane, and belongs to the technical field of lithium ion battery electrolyte. The preparation method comprises the following steps: firstly, selecting a high-molecular polymer and highly dispersed inorganic nanoparticles, preparing a thickness-controllable ultrathin composite electrolyte self-supporting base membrane by a tape casting method, and then selecting a carbonate-based polymer electrolyte with high ionic conductivity, and preparing the ultrathin organic-inorganic composite electrolyte membrane by a solution pouring method. The thickness of the prepared ultrathin organic-inorganic composite electrolyte membrane can be reduced to be less than 10 microns, and meanwhile, the ultrathin organic-inorganic composite electrolyte membrane has high ionic conductivity, a wide electrochemical stable window and excellent mechanical properties. The preparation process is simple, is convenient for large-scale production, and is suitable for commercial lithium ion solid-state batteries.

Description

technical field [0001] The invention relates to a lithium ion battery solid electrolyte, in particular to the preparation and application of an ultra-thin organic-inorganic composite solid electrolyte membrane, and belongs to the technical field of lithium ion battery electrolytes. Background technique [0002] As a new type of electrochemical energy storage device, lithium-ion batteries have been widely used in mobile electronic devices, electric vehicles, and emergency power supplies, and have been gradually promoted and used in energy storage power stations, rail transit, and aerospace. So far, commercial lithium-ion batteries mostly use conventional organic liquid electrolytes, such as ethylene carbonate and propylene carbonate. However, lithium-ion batteries using organic liquid electrolytes have huge safety problems, which seriously hinder the further popularization and wider application of lithium-ion batteries, mainly because organic electrolytes usually have high ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/0525
CPCH01M10/056H01M10/0525H01M2300/0085Y02P70/50
Inventor 尉海军王永涛郭现伟吴玲巧
Owner BEIJING UNIV OF TECH
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