Sulfide composite solid-state electrolyte membrane, preparation method thereof and solid-state battery

A technology of solid electrolyte membrane and solid electrolyte, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, battery electrodes, etc., can solve problems such as the inability to prepare large-area sulfide solid electrolyte membranes, achieve good chemical compatibility, reduce crystal The effects of boundary impedance and high ionic conductivity

Active Publication Date: 2022-07-29
广东马车动力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a sulfide composite solid electrolyte membrane and its preparation method, and a solid-state battery, aiming at solving the problem that the prior art cannot prepare an extremely thin sulfide solid electrolyte membrane in a large area

Method used

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  • Sulfide composite solid-state electrolyte membrane, preparation method thereof and solid-state battery
  • Sulfide composite solid-state electrolyte membrane, preparation method thereof and solid-state battery
  • Sulfide composite solid-state electrolyte membrane, preparation method thereof and solid-state battery

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Embodiment 1

[0038] Weigh 3g where R 1 =Cl, R 2 =CH 3 Dissolve in 15g propyl acetate and disperse evenly, then add 30g sulfide and stir evenly to obtain a mixed slurry. The above slurry is evenly spin-coated on the substrate, baked at 60°C for 6h, pressurized at 200MPa, and peeled off to obtain The composite solid electrolyte membrane with a thickness of 8 μm has a tested conductivity of 2.8*10 -3 S / cm.

Embodiment 2

[0040] Weigh 2g where R 1 =Cl, R 2 =CH 3 , R 3 =C 2 H 5 Dissolved in 20g of ethyl benzoate and dispersed evenly, then added 30g of sulfide and stirred evenly to obtain a mixed slurry. The above slurry was evenly spin-coated on the substrate, baked at 50°C for 8h, pressurized at 150MPa, and peeled off. A composite solid electrolyte membrane with a thickness of 10 μm was obtained, and the tested conductivity was 3.6*10 -3 S / cm.

Embodiment 3

[0042] Weigh 2g where R 1 =Cl, R 2 =CH 3 , R 3 =C 2 H 5 , R4=OCH 3 Dissolve in 20g o-xylene and disperse evenly, then add 30g sulfide and stir evenly to obtain a mixed slurry. The above slurry is evenly spin-coated on the substrate, baked at 80°C for 4h, pressurized at 300MPa, and peeled off to obtain The composite solid electrolyte membrane with a thickness of 5μm has a tested conductivity of 5.3*10 -3 S / cm.

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Abstract

The invention discloses a sulfide composite solid-state electrolyte membrane, a preparation method thereof and a solid-state battery, and the preparation method comprises the following steps: dissolving a thermally-induced polymerized binder precursor in an organic solvent to obtain a solution; adding sulfide solid electrolyte into the solution, and uniformly mixing to obtain slurry; and coating the slurry on a substrate, reacting at 30-80 DEG C, drying, and pressurizing to prepare the sulfide composite solid electrolyte membrane. Due to the adoption of the thermally-induced polymerized binder precursor, the large-area preparation process of the composite solid electrolyte membrane is simple and convenient, and the composite solid electrolyte membrane has higher mechanical strength and flexibility and higher ionic conductivity (greater than or equal to 10 <-4 > S / cm).

Description

technical field [0001] The invention relates to the technical field of solid-state electrolyte membranes, in particular to a sulfide composite solid-state electrolyte membrane, a preparation method thereof, and a solid-state battery. Background technique [0002] With the development of lithium battery technology, in order to solve the safety problems such as combustion and explosion that may occur in current liquid lithium-ion batteries during safety tests such as thermal abuse, short circuit, and acupuncture, solid-state batteries are increasingly being valued by lithium battery practitioners. Solid-state batteries not only have good safety performance, but also can greatly improve the mass energy density of the battery. However, the solid electrolyte membrane is currently limited by its thickness, and it is difficult to improve the volumetric energy density of the battery. In addition, the thick solid electrolyte membrane will also affect the The conduction of lithium ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M10/052H01M10/0565H01M10/058
CPCH01M10/0565H01M10/058H01M4/622H01M10/052Y02E60/10
Inventor 沈亚斐李真棠
Owner 广东马车动力科技有限公司
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