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

A technology of solid-state electrolyte and solid-state battery, which is applied in the direction of non-aqueous electrolyte battery, electrolyte battery manufacturing, solid electrolyte, etc., and can solve the problems of poor electrode interface compatibility and high brittleness of solid electrolyte

Inactive Publication Date: 2021-11-05
EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite solid electrolyte and its preparation method, as well as a solid-state battery, aiming to solve the problem of high brittleness and poor compatibility with the electrode interface of the existing solid electrolyte to a certain extent

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

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preparation example Construction

[0046] as attached figure 1 As shown, the second aspect of the embodiment of the present invention provides a method for preparing a composite solid electrolyte, comprising the following steps:

[0047] S10. preparing a precursor of lithium titanium aluminum phosphate;

[0048] S20. After mixing the pore-forming material and the precursor, performing a calcination treatment to obtain lithium titanium aluminum phosphate with a porous structure;

[0049] S30. Filling the mixed solution of lithium salt and polymer into the pores of the porous structure of lithium titanium aluminum phosphate, and drying to obtain a composite solid electrolyte.

[0050] In the preparation method of the composite solid electrolyte provided by the second aspect of the embodiment of the present invention, the precursor of lithium titanium aluminum phosphate is first prepared, and the precursor is used as the raw material component and mixed with the pore-forming material, and then calcined, and the p...

Embodiment 1

[0074] A kind of composite solid electrolyte, its preparation comprises the steps:

[0075] ① Mix lithium nitrate, aluminum nitrate, phosphoric acid, ethanol, and isopropyl titanate according to the mass ratio of 10:11:0.3:1.7:1.3 to obtain a precursor solution;

[0076] ② Add polymethyl methacrylate with a particle size of 500nm, its mass ratio to lithium nitrate is 0.5:1, disperse by ultrasonic for 30min, then pour it into a polytetrafluoroethylene mold, keep it warm at 500°C for 3h, and then It was kept at 750° C. for 11 hours, and air circulation was maintained throughout the calcination process to obtain a porous lithium titanium aluminum phosphate with a pore diameter of 0.2 μm and a porosity of 35%.

[0077] ③ Put the porous lithium titanium aluminum phosphate into the polyvinylidene fluoride solution containing lithium hexafluorophosphate (the molar ratio of lithium salt and polymer is 1:3), and fill the polymer solution into the porous lithium titanium aluminum phosph...

Embodiment 2

[0080] A composite solid electrolyte, which differs from Example 1 in that the mass ratio of lithium nitrate, aluminum nitrate, phosphoric acid, ethanol, and isopropyl titanate is 5:12:0.1:0.2:1.8.

[0081] A solid-state battery is assembled into a solid-state battery by matching the composite solid-state electrolyte obtained in Example 2 with a metal lithium negative electrode and a lithium iron phosphate positive electrode.

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a composite solid electrolyte, a preparation method thereof and a solid-state battery. The composite solid electrolyte comprises lithium titanium aluminum phosphate, a lithium salt and a polymer, wherein the lithium titanium aluminum phosphate has a porous structure, and the lithium salt and the polymer are at least mixed and filled in the pores of the porous structure of the lithium titanium aluminum phosphate. According to the composite solid electrolyte provided by the invention, through the synergistic effect of the titanium aluminum lithium phosphate with the porous structure and the lithium salt and the polymer which are filled in the pores of the titanium aluminum lithium phosphate, the excellent ionic conductivity and flexibility of the composite solid electrolyte are ensured, and the interfacial compatibility of the composite solid electrolyte and an electrode is improved, the interface impedance is reduced, and the ion migration transmission efficiency is further improved.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a composite solid electrolyte, a preparation method thereof, and a solid-state battery. Background technique [0002] With the increasing demand for high specific energy and high safety power batteries in the field of automobile consumption, the energy density design of traditional liquid lithium-ion batteries is approaching the upper limit, and the safety performance is becoming less and less optimistic. Therefore, solid electrolytes that can replace liquid electrolytes have been sought after by the outside world in recent years. Solid-state batteries can use metallic lithium as the negative electrode of power batteries, which can effectively prevent problems such as short-circuit thermal runaway caused by lithium dendrites in traditional electrolytes, and greatly increase the energy density of power batteries. However, the inherent instability of the interface of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/058H01M10/052H01M10/0525
CPCH01M10/056H01M10/058H01M10/052H01M10/0525H01M2300/0091H01M2300/0065H01M2220/20Y02P70/50Y02E60/10
Inventor 梁伟
Owner EVERGRANDE NEW ENERGY TECH SHENZHEN CO LTD