Composite solid electrolyte, preparation method thereof and solid-state battery

A solid electrolyte and electrolyte technology, applied in the direction of electrolyte immobilization/gelation, secondary batteries, secondary battery repair/maintenance, etc., can solve the problem of low ionic conductivity, high cost of inorganic sulfide electrolytes, and poor practicability And other issues

Inactive Publication Date: 2021-09-07
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently commonly used solid-state electrolytes, such as polymer solid-state electrolytes, inorganic oxide electrolytes, and inorganic halide electrolytes, have an order of magnitude difference in conductivity from liquid electrolytes, so it is difficult to apply them in practice; the highest conductivity of inorganic sulfide electrolytes can reach 2.2x10 -2 S / cm, which is an order of magnitude higher than liquid electrolyte, is an ideal solid electrolyte material. However, the cost of inorganic sulfide electrolyte is high, and it is easy to react with solvents and polymer binders and fail.
In addition, some composite electrolytes have appeared, among which the more common composite electrolyte is composed of polyethylene oxide, lithium salt, and inorganic oxide, but its ionic conductivity is low.
A few reported composite electrolytes containing sulfide electrolytes are mostly composite materials formed by mixing polyethylene oxide and inorganic sulfide electrolyte solutions, and the sulfide electrolyte in this composite electrolyte material can promote the decomposition and deterioration of polyethylene oxide. Composite material performance, practicality is not strong

Method used

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  • Composite solid electrolyte, preparation method thereof and solid-state battery
  • Composite solid electrolyte, preparation method thereof and solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this example, a composite solid electrolyte is prepared, and the specific process includes the following steps:

[0018] S1, get the raw material components according to the following ratio: 20wt% lithium salt LiTFSI, 60wt% polysulfide (structural formula is ) and 20wt% inorganic sulfide electrolyte LGPS (Li10GeP2S12);

[0019] S2. Add the lithium salt LiTFSI into the organic solvent acetonitrile. After fully stirring and dissolving, add polysulfide and LGPS in sequence, and after ultrasonic dispersion, stir at 1200r / min for 2h to obtain a composite electrolyte slurry, and then cast it in a mold for 60 After heating and drying at ℃ for 24 hours, a composite solid electrolyte was obtained.

Embodiment 2

[0021] In this example, a composite solid electrolyte is prepared, and the specific process includes the following steps:

[0022] S1, get the raw material components according to the following ratio: 20wt% lithium salt LiTFSI, 60wt% polysulfide (structural formula is ) and 20wt% binary sulfide electrolyte Li 2 S-P 2 S 5 ;

[0023] S2. Add lithium salt LiTFSI into the organic solvent acetonitrile, stir and dissolve, then add polysulfide and Li 2 S-P 2 S 5 , and ultrasonically dispersed, stirred at 1200r / min for 2h to obtain a composite electrolyte slurry, and then cast in a mold, heated and dried at 60°C for 24h to obtain a composite solid electrolyte.

Embodiment 3

[0025] In this example, a composite solid electrolyte is prepared, and the specific process includes the following steps:

[0026] S1, get the raw material components according to the following ratio: 20wt% lithium salt LiTFSI, 60wt% polysulfide (structural formula is ) and 20wt% ternary sulfide electrolyte Li 2 S-P 2 S 5 -SnS;

[0027] S2. Add the lithium salt LiTFSI into the organic solvent ethyl acetate, stir and dissolve, then add polysulfide and Li 2 S-P 2 S 5 -SnS, and ultrasonically dispersed, stirred at 1200r / min for 2h to obtain a composite electrolyte slurry, then cast in a mold, heated and dried at 60°C for 24h to obtain a composite solid electrolyte.

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PUM

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Abstract

The invention discloses a composite solid-state electrolyte, a preparation method thereof and a solid-state battery. The composite solid-state electrolyte comprises the following raw material components: a polymer containing a sulfur element, a lithium salt and an inorganic sulfide electrolyte, wherein the polymer containing the sulfur element contains C-Sx-C bonds, and x is a positive integer. According to the present invention, the composite solid electrolyte is formed by compounding the specific sulfur-containing polymer, the lithium salt and the inorganic sulfide electrolyte, and has advantages of excellent mechanical property, high ionic conductivity and low raw material cost.

Description

technical field [0001] The invention relates to the technical field of solid-state batteries, in particular to a composite solid-state electrolyte, a preparation method thereof and a solid-state battery. Background technique [0002] A solid-state battery is a lithium-ion battery that uses a solid-state electrolyte. There is no liquid in its structure, and all materials exist in solid form. As the core of solid-state batteries, solid-state electrolytes have the advantages of non-flammability, non-corrosion, non-volatility, and no leakage problems. Therefore, solid-state batteries have high safety, long life, and high energy density. However, currently commonly used solid-state electrolytes, such as polymer solid-state electrolytes, inorganic oxide electrolytes, and inorganic halide electrolytes, have an order of magnitude difference in conductivity from liquid electrolytes, so it is difficult to apply them in practice; the highest conductivity of inorganic sulfide electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0565H01M10/4235H01M2300/0085Y02E60/10
Inventor 谢普梁世硕袁康文佳琪
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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