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Inorganic/organic composite solid electrolyte and preparation method and application thereof

A solid electrolyte and organic technology, applied in the field of inorganic/organic composite solid electrolyte and its preparation, can solve the problems of low room temperature ionic conductivity and poor electrochemical performance of batteries

Active Publication Date: 2021-06-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Organic polymer solid electrolytes are widely used due to their good safety, film formation and viscoelasticity, good interfacial contact and compatibility with electrodes, but they have high crystallinity at room temperature, so their room temperature ionic Low electrical conductivity, resulting in poor electrochemical performance of the battery at room temperature

Method used

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  • Inorganic/organic composite solid electrolyte and preparation method and application thereof
  • Inorganic/organic composite solid electrolyte and preparation method and application thereof
  • Inorganic/organic composite solid electrolyte and preparation method and application thereof

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preparation example Construction

[0031] The invention provides a preparation method of an inorganic / organic composite solid electrolyte, comprising the following steps:

[0032] (1) Mix polyethylene oxide, polyvinylidene fluoride-hexafluoropropylene copolymer, sodium salt, the first filler and an organic solvent to obtain the first slurry; the first filler is P2 modified by a silane coupling agent type layered oxide fast ion conductor; the particle size of the first filler is 500nm~1.5μm;

[0033] (2) Mix polyethylene oxide, polyvinylidene fluoride-hexafluoropropylene copolymer, sodium salt, and a second filler with an organic solvent to obtain a second slurry; the second filler is P2 modified by a silane coupling agent Type layered oxide fast ion conductor; the particle size of the second filler is less than 500nm;

[0034] (3) coating the first slurry obtained in the step (1) on the substrate, and drying to obtain a layer of solid electrolyte;

[0035] (4) coating the second slurry obtained in the step (2...

Embodiment 1

[0071] (1) Add the silane coupling agent to 20% ethanol solution under stirring to obtain a mixed solution; the concentration of the silane coupling agent in the mixed solution is 2%;

[0072] (2) P2-type layered oxide fast ion conductor Na 2 Ni 2 TeO 6 Add it into the mixed solution obtained in step (1) under stirring, filter it after stirring for 20 minutes, and dry it at 80°C, and ball mill it to a particle size of 900nm-1.2μm to obtain the first filler; wherein, the silane coupling agent 1.5% of the mass of the P2-type layered oxide fast ion conductor;

[0073] (3) Disperse polyethylene oxide with a viscosity-average molecular weight of 600,000 in dimethylformamide at 1.6 wt%, and stir at 60°C to obtain a uniform polymer slurry liquid; The filler is added under the condition of stirring at 60°C, after mixing evenly, sodium hexafluorophosphate and PVDF-HFP copolymer are added under the condition of stirring at 60°C, and the first slurry is obtained after mixing evenly; a...

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Abstract

The invention provides an inorganic / organic composite solid electrolyte preparation method, which comprises: mixing polyoxyethylene, a polyvinylidene fluoride-hexafluoropropylene copolymer, a sodium salt, a first filler and an organic solvent to obtain a first slurry, wherein the first filler is a P2 type layered oxide fast ion conductor modified by a silane coupling agent and the particle size of the first filler is 500 nm to 1.5 [mu] m; mixing polyoxyethylene, a polyvinylidene fluoride-hexafluoropropylene copolymer, sodium salt, a second filler and an organic solvent to obtain second slurry, wherein the second filler is a P2 type layered oxide fast ion conductor modified by a silane coupling agent and the particle size of the second filler is smaller than 500nm; coating a substrate with the first slurry, and drying to obtain a layer of solid electrolyte; and coating the second slurry on the surface of the layer of solid electrolyte, and drying to obtain the inorganic / organic composite solid electrolyte.

Description

technical field [0001] The invention belongs to the technical field of solid electrolytes, and in particular relates to an inorganic / organic composite solid electrolyte and its preparation method and application. Background technique [0002] Sodium-ion batteries are rich in sodium resources and low in cost, and have similar working principles to lithium-ion batteries. They can be used as a beneficial supplement to lithium-ion batteries for low-speed electric vehicles and large-scale energy storage. The large diameter makes its transport kinetics in the electrolyte slower than that of lithium ions. Therefore, electrolyte materials for sodium-ion batteries have always been the focus of research in the sodium-ion battery industry. [0003] According to the different electrolyte states of sodium-ion batteries, they are divided into two categories: liquid electrolytes and solid electrolytes. Liquid electrolytes have relatively high ionic conductivity and are divided into three ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0561H01M10/058H01M10/054H01M10/42
CPCH01M10/0561H01M10/058H01M10/054H01M10/4235H01M2300/0091H01M2300/0065Y02P70/50Y02E60/10
Inventor 陈人杰罗锐胡昕吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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