Fabric-reinforced ultrathin sulfide electrolyte sheet as well as preparation method and application thereof
A sulfide electrolyte, fabric enhancement technology, applied in the field of energy storage, can solve the problems of cumbersome preparation technology, low efficiency, and difficulty in reflecting the advantages of high energy density of batteries.
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[0032] The invention provides a method for preparing a fabric-reinforced ultra-thin sulfide electrolyte sheet, comprising the following steps:
[0033] Spinning the polymer to obtain a three-dimensional skeleton of the polymer fabric; dispersing the sulfide electrolyte powder in a solvent to obtain a sulfide electrolyte suspension;
[0034] The sulfide electrolyte suspension is compounded in the polymer fabric three-dimensional framework, dried, and then pressurized and densified to obtain a fabric-reinforced ultrathin sulfide electrolyte sheet.
[0035] The invention prepares the three-dimensional skeleton of the polymer fabric by spinning the polymer. In the present invention, the polymer is preferably selected from the group consisting of styrene-ethylene-butylene-styrene copolymer, butadiene-styrene copolymer, polytetrafluoroethylene, polyvinylidene fluoride, polyarylsulfone, Polyethersulfone series, polymethacrylate series, polyacrylonitrile series, cellulose series, pol...
Embodiment 1
[0066] 0.1 part of cellulose (M n =500000g / mol) is prepared into a three-dimensional skeleton of cellulose fabric by solution spinning technology, the average pore diameter of the skeleton is 3 μm, and the thickness is 7 μm; 99.9 parts of sulfide electrolyte Li 3.25 Ge 0.25 P 0.75 S 3.25 Uniformly dispersed in n-hexane by mechanical stirring to obtain Li with a solid content of 0.2 wt%. 3.25 Ge 0.25 P 0.75 S 3.25 / n-hexane slurry; Li 3.25 Ge 0.25 P 0.75 S 3.25 The / n-hexane slurry was compounded into the three-dimensional skeleton of the cellulose fabric by scraping coating, and dried in vacuum at 60 °C to remove the solvent n-hexane; the electrolyte powder layer was densified by flat static pressure to obtain a 10 μm thick single-layer Li 3.25 Ge 0.25 P 0.75 S 3.25 Electrolyte sheet.
[0067] At room temperature, for the prepared Li 3.25 Ge 0.25 P 0.75 S 3.25 Electrochemical impedance spectroscopy and mechanical performance tests were performed on the electr...
Embodiment 2
[0069] One part of polyethersulfone (the tensile strength of pure polyethersulfone is 100 MPa) was prepared into a three-dimensional polyethersulfone fabric skeleton by melt spinning technology, the average pore size of the skeleton was 0.5 μm, and the thickness was 4 μm; 99 parts of sulfide electrolyte Li 6 P.S. 5 Br was uniformly dispersed in toluene by mechanical stirring and ultrasonic dispersion to obtain Li with a solid content of 5 wt%. 6 P.S. 5 Br / toluene slurry; Li 6 P.S. 5 The Br / toluene slurry was composited into the three-dimensional framework of polyethersulfone fabric by casting, and dried in vacuum at 110 °C to remove the solvent toluene; the electrolyte powder layer was densified by isostatic pressing to obtain a 5 μm thick monolayer Li 6 P.S. 5 Br electrolyte sheet.
[0070] At room temperature, for the prepared Li 6 P.S. 5 Electrochemical impedance spectroscopy and mechanical performance tests were performed on the Br electrolyte sheet. In the electro...
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