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Interpenetrating network structure layer and in-situ preparation method and application thereof

A technology of interpenetrating network structure and in-situ preparation, applied in the field of interpenetrating network structure electrolyte interface layer and in-situ preparation, can solve problems such as interface problems, poor air stability, poor interface stability, etc. Mechanical strength, effect of inhibiting the growth of lithium dendrites

Active Publication Date: 2022-04-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, inorganic solid electrolytes have poor air stability, poor interface stability, and interface problems between positive and negative electrodes, which limit the development and application of inorganic solid electrolytes.

Method used

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  • Interpenetrating network structure layer and in-situ preparation method and application thereof
  • Interpenetrating network structure layer and in-situ preparation method and application thereof
  • Interpenetrating network structure layer and in-situ preparation method and application thereof

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Effect test

Embodiment 1

[0041] In this embodiment, a method for in-situ preparation of an interpenetrating network structure electrolyte interface layer includes the following steps:

[0042] (1) Preparation of interfacial layer precursor: under the atmosphere of protective gas, first mix 1g of 1-vinyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt) (VMImTFSI) and LiTFSI (20mol% ) to mix, then add photoinitiator 2-hydroxyl-2-methylpropiophenone and mix evenly, UV light polymerization to obtain polyionic liquid (PIL), then 2mL 1,3 dioxolane (DOL) and LiPF 6 The initiator is mixed evenly and added to the PIL to make it absorbed to obtain the interface layer precursor gel;

[0043] (2) 200mg of inorganic solid electrolyte Li 10 GeP 2 S 12 Press into a ceramic sheet with a diameter of 12 mm, place the above precursor solution on the surface of the inorganic electrolyte sheet, let it stand at room temperature, pass LiPF 6 Initiated cationic polymerization results in an electrolyte interfa...

Embodiment 2

[0049] The difference between this embodiment and embodiment 1 is:

[0050] (1) Preparation of interfacial layer precursor: under the atmosphere of protective gas, first mix 1g of 1-vinyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide salt) (VMImTFSI) and LiTFSI (60mol% ) to mix, then add photoinitiator 2-hydroxyl-2-methylpropiophenone and mix evenly, UV light polymerization to obtain polyionic liquid (PIL), then 2mL 1,3 dioxolane (DOL) and LiPF 6 The initiator is mixed evenly and added to the PIL to make it absorbed to obtain the interface layer precursor gel;

[0051] (2) 200mg of inorganic solid electrolyte Li 10 GeP 2 S 12 Press into a ceramic sheet with a diameter of 12mm, place the above-mentioned precursor on the surface of the inorganic electrolyte sheet, let it stand at room temperature, pass LiPF 6 Initiated ring-opening polymerization yields an electrolyte interfacial layer with an interpenetrating network structure.

[0052] (3) Assembling the inorgani...

Embodiment 3

[0054] The difference between this embodiment and embodiment 1 is:

[0055] (1) Preparation of interfacial layer precursor: under the atmosphere of protective gas, firstly mix 2mL 1,3 dioxolane (DOL) and LiPF 6 Mix well, stand for 6h, ring-opening polymerization to obtain polyether molecular network polymer, then 1g 1-vinyl-3-butylimidazole bis(trifluoromethanesulfonyl)imide salt) (VBImTFSI) and LiTFSI (80mol %), photoinitiator 2-hydroxyl-2-methyl propiophenone mix evenly, join in the above-mentioned molecular network polymer, make it absorb, obtain interface layer precursor gel;

[0056] (2) 200mg of inorganic solid electrolyte Li 10 GeP 2 S 12 Press into a ceramic sheet with a diameter of 12 mm, place the above precursor on the surface of the inorganic electrolyte sheet, and irradiate with ultraviolet light to obtain an electrolyte interface layer with an interpenetrating network structure.

[0057] (3) Assembling the inorganic solid-state electrolyte with the interfacia...

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Abstract

The invention discloses an interpenetrating network structure layer and an in-situ preparation method and application thereof. The layer can be used as an interface buffer layer between an inorganic solid electrolyte and a lithium metal negative electrode, or a polymer electrolyte. The preparation method comprises the following steps: carrying out ultraviolet irradiation polymerization to obtain a polyion liquid (PIL) polymer molecular chain network, mixing an alkylene oxide monomer with the network, uniformly dispersing the alkylene oxide monomer in the network, carrying out ring-opening polymerization reaction to generate a polyether molecular chain network with high molecular weight, and obtaining the polymer electrolyte membrane with an interpenetrating network structure in situ. As an interface layer, side reaction caused by contact of inorganic solid electrolyte and lithium metal can be effectively avoided, and the cycle performance of the all-solid-state battery is improved. The in-situ formation of the electrolyte can also significantly improve the compatibility of the electrolyte and the electrode, reduce the interface impedance, and improve the conductivity and mechanical strength of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis and batteries, and in particular relates to an interpenetrating network structure electrolyte interface layer, a method for in-situ preparation and application thereof. Background technique [0002] In recent years, due to the advantages of high energy density, high open circuit voltage, long cycle life, and low self-discharge, lithium batteries have attracted widespread attention. At present, traditional lithium batteries use organic liquid electrolytes that are volatile, flammable, and easy to leak, which poses great safety hazards. Therefore, improving the safety of batteries has become an urgent problem to be solved. Solid electrolyte (SE) has the advantages of thermal stability, non-flammability, no leakage and no volatilization, and it has a higher thermal runaway initiation temperature, which greatly improves It ensures the stability and safety of the battery during use. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L39/04C08L71/00C08F126/06C08F2/48H01M10/056H01M10/052H01M10/058
CPCY02P70/50Y02E60/10
Inventor 赵金保沈秀曾月劲张鹏
Owner XIAMEN UNIV
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