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Solid electrolyte and preparation method and application thereof

A technology of solid electrolyte and solid electrolyte membrane, which is applied in the direction of electrolyte, electrolyte immobilization/gelation, circuit, etc., which can solve the problems of continuous combustion, poor safety, environment and construction personnel injury, and achieve suppression of fire and explosion and low cost Effect

Pending Publication Date: 2021-12-31
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrolyte membrane prepared by this method is brittle and poor in safety, and it still needs to use a large amount of N-methylpyrrolidone, dimethylacetamide and dimethylformamide toxic solvents in the process, which is extremely harmful to the environment and construction personnel.
[0005] The batteries provided in the above two documents still have problems such as fire, continuous burning and explosion.

Method used

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  • Solid electrolyte and preparation method and application thereof

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Effect test

Embodiment 1

[0044] This embodiment provides a solid electrolyte, which includes flame-retardant microcapsules, polyethylene oxide powder, and ion conductor Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 The flame-retardant microcapsules include a capsule wall and a core material; the capsule wall is an ethylene-vinyl acetate copolymer hot melt adhesive with a melting temperature of 110° C., and the core material is aluminum hydroxide with an average particle size of 30 nm.

[0045] The preparation method of the solid electrolyte is as follows:

[0046] (1) Add ethylene-vinyl acetate copolymer hot melt adhesive and aluminum hydroxide into acetone solvent according to the mass ratio of 20:80, and disperse by ball milling for 4 hours to obtain a mixed solution;

[0047] (2) Send the mixed liquid in step (1) into the air-flow spray dryer, the inlet and outlet temperatures are 100°C and 80°C respectively, the acetone solvent is quickly evaporated and removed, and the nanometer powder wrapped by ethylene-v...

Embodiment 2

[0051] This embodiment provides a solid electrolyte, which includes flame retardant microcapsules, polymethyl methacrylate powder and ion conductor Li 1.5 Al 0.5 Ge 1.5 (PO4) 3 ; The flame-retardant microcapsules include a capsule wall and a core material; the capsule wall is polyurethane hot melt adhesive with a melting temperature of 150° C., and the core material is zinc borate with an average particle size of 100 nm.

[0052] The preparation method of the solid electrolyte is as follows:

[0053] (1) Polyurethane hot melt adhesive and zinc borate are added in the acetone solvent according to the mass ratio of 30:70, and the ball mill is dispersed for 4 hours to obtain the mixed solution;

[0054] (2) Send the mixed solution of step (1) into the air-flow spray dryer, the inlet and outlet temperatures are 100°C and 80°C respectively, the acetone solvent is quickly evaporated and removed, and the polyurethane-wrapped nano-zinc borate flame-retardant microcapsules are obtai...

Embodiment 3

[0058] This embodiment provides a solid electrolyte, which includes flame-retardant microcapsules, polyvinylidene fluoride-hexafluoropropylene powder, and ion conductor Li 7 La 3 Zr 2 o 12 ; The flame-retardant microcapsules include a capsule wall and a core material; the capsule wall is polyamide hot-melt adhesive with a melting temperature of 180° C., and the core material is zinc borate with an average particle size of 500 nm.

[0059] The preparation method of the solid electrolyte is as follows:

[0060] (1) The polyamide hot melt adhesive and zinc borate are added in the acetone solvent according to the mass ratio of 15:85, and ball milling is dispersed for 4 hours to obtain a mixed solution;

[0061] (2) Send the mixed solution of step (1) into the air-flow spray dryer, the inlet and outlet temperatures are 100°C and 80°C respectively, the acetone solvent is quickly evaporated and removed, and the polyurethane-wrapped nano-zinc borate flame-retardant microcapsules ar...

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Abstract

The invention provides a solid electrolyte and a preparation method and application thereof. The solid electrolyte comprises a flame-retardant microcapsule, polymer powder and an ionic conductor. The flame-retardant microcapsule comprises a capsule wall and a core material. The capsule wall comprises a hot melt adhesive, and the core material comprises nano flame-retardant inorganic particles. The flame-retardant microcapsule is mixed with the polymer powder and the ion conductor, then the solid electrolyte membrane is further obtained, hot melt adhesive on the wall of the flame-retardant microcapsule can be fused and broken in an extremely short time under the high-temperature condition, nano flame-retardant particles are released to play a flame-retardant effect, and therefore fire and explosion of the lithium ion solid-state battery are inhibited, and meanwhile, the cost is low, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and relates to a solid-state electrolyte and its preparation method and application. Background technique [0002] At present, lithium-ion batteries are more and more pursuing high energy density and long-term cycle stability. However, safety problems such as thermal runaway caused by overcharge, overdischarge, extrusion, impact or short circuit, which can cause fires or even explosions, frequently occur. A key obstacle restricting the development of lithium-ion batteries. Solid-state batteries assembled with solid-state electrolytes have become one of the effective ways to solve the safety problems of lithium-ion batteries. In particular, the combination of polymer solid-state electrolytes and inorganic solid-state electrolytes can effectively solve the problems of low ionic conductivity and large interface impedance of solid-state electrolytes. question. However, the main compon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0562H01M10/0525
CPCH01M10/0565H01M10/0562H01M10/0525H01M2300/0085H01M2300/0091Y02E60/10
Inventor 尚旭李晓龙张文强袁皓魏礼勇宋文锋
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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