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High-voltage-resistant composite solid electrolyte, preparation method thereof and all-solid-state lithium battery

A solid electrolyte and solid electrolyte layer technology, applied in the field of lithium-ion batteries, can solve problems such as high interface internal resistance, poor electrochemical stability, and narrow electrochemical window, and achieve adjustable pore size, improved interface resistance, and high specific surface area. Effect

Pending Publication Date: 2022-07-12
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems of narrow electrochemical window, poor electrochemical stability and high interfacial internal resistance in existing polymer solid electrolytes, the present invention provides a high-voltage resistant composite solid electrolyte, a preparation method thereof, and an all-solid-state lithium battery, which not only It can broaden the electrochemical window of the solid electrolyte, reduce the internal resistance of the battery, and improve the electrochemical stability and lithium ion transport performance of the solid electrolyte, prolonging the battery cycle life

Method used

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preparation example Construction

[0035] Meanwhile, the present application also provides a method for preparing a high-pressure composite solid electrolyte, comprising the following steps:

[0036] S1. Preparation of COFs substrate: a. Soak the porous nano-oxide substrate in deionized water at 80-90°C for 1-3h, and then immerse it in a hydrochloric acid solution with a concentration of 0.5-1.0M / L to activate the surface hydroxyl groups, and then immerse it in a hydrochloric acid solution with a concentration of 0.5-1.0M / L. After soaking in a toluene solution containing 3-aminopropyltriethoxysilane for 1-3 hours, after the surface loading of amino groups is completed, rinse with absolute ethanol for 3-5 times to obtain an amino-modified porous nano-oxide substrate; The substrate is any one of a porous nano alumina substrate, a porous nano molybdenum oxide substrate, a porous nano silicon oxide substrate, a porous nano copper oxide substrate, a porous nano indium oxide substrate, a porous nano silver oxide subst...

Embodiment 1

[0047] The porous nano-alumina substrate was soaked in deionized water at 86 °C for 2 hours, then immersed in a hydrochloric acid solution with a concentration of 0.7M / L, and then immersed in a toluene solution containing 3-aminopropyltriethoxysilane for 2 hours. Then, rinsed with absolute ethanol for 4 times to obtain an amino-modified porous nano-oxide substrate; tetrakis-(4-anilino)-methane, terephthalic acid and acetic acid were dissolved in dioxygen in a mass ratio of 15:8:112 In ethane, ultrasonically dispersed for 18min to obtain a light yellow transparent solution, and the obtained light yellow transparent solution was placed in an autoclave lined with polytetrafluoroethylene; terephthalic acid was dissolved in dioxyethane (massfraction 11%) to obtain a mixed solution, soak the amino-modified porous nano-oxide substrate obtained above in the mixed solution at 158 ​​°C for 1 h, take it out after the end, put it vertically into an autoclave, and heat it at 140 °C for 75 h...

Embodiment 2

[0053] The porous nano-alumina substrate was soaked in deionized water at 90°C for 1 hour, then immersed in a hydrochloric acid solution with a concentration of 0.5M / L, and then immersed in a toluene solution containing 3-aminopropyltriethoxysilane for 3 hours. Then, rinsed with absolute ethanol for 5 times to obtain an amino-modified porous nano-oxide substrate; tetra-(4-anilino)-methane, terephthalic acid and acetic acid were dissolved in dioxygen in a mass ratio of 20:5; 50 In ethane, ultrasonically dispersed for 10min to obtain a light yellow transparent solution, and the obtained light yellow transparent solution was placed in an autoclave lined with polytetrafluoroethylene; terephthalic acid was dissolved in dioxyethane (mass fraction 20%) to obtain a mixed solution, soak the amino-modified porous nano-oxide substrate obtained above in the mixed solution at 170 °C for 0.5 h, take it out after the end, put it vertically into an autoclave, and heat it at 200 °C for 80 h to ...

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Abstract

The invention discloses a high-voltage-resistant composite solid electrolyte, a preparation method of the high-voltage-resistant composite solid electrolyte and an all-solid-state lithium battery, and relates to the technical field of lithium ion batteries, and the high-voltage-resistant composite solid electrolyte is formed by hot pressing of a first composite solid electrolyte layer and a second composite solid electrolyte layer; the first composite solid electrolyte layer comprises a COFs matrix and a polymer electrolyte A loaded on the surface of the COFs matrix, and the polymer electrolyte A comprises polyoxyethylene, bismuth trioxide, a lithium salt and polyvinylidene fluoride; the second composite solid electrolytic layer comprises a COFs matrix and a polymer electrolyte B loaded on the surface of the COFs matrix; and the polymer electrolyte B comprises polymethyl methacrylate, bismuth trioxide, lithium salt and polyvinylidene fluoride. According to the composite solid electrolyte, the electrochemical window of the solid electrolyte is widened, the interface resistance is reduced, the interface stability of the positive electrode and the negative electrode and the lithium ion transmission performance are improved, the composite solid electrolyte can be simultaneously suitable for a lithium metal negative electrode and a high-voltage ternary positive electrode, and the cycle performance of a battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage-resistant composite solid electrolyte, a preparation method thereof, and an all-solid-state lithium battery. Background technique [0002] In lithium-ion battery applications, solid electrolytes can significantly improve the energy density and safety of lithium-ion batteries compared with traditional liquid electrolytes, and are thus widely used. At present, solid electrolytes are mainly divided into two categories: inorganic solid electrolytes and polymer solid electrolytes. However, in the actual use process, due to the large interface resistance of the inorganic solid electrolyte, it is unstable to the lithium metal anode, and the critical current density of lithium dendrites penetrating the solid electrolyte to cause a short circuit of the battery is small, which limits the use of inorganic solid electrolytes in all-solid-state lithium batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/052Y02P70/50
Inventor 宫娇娇许海萍陈军
Owner WANXIANG 123 CO LTD
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