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In-situ preparation method of solid-state battery

A solid-state battery, in-situ preparation technology, used in the manufacture of electrolyte batteries, secondary batteries, battery pack components, etc., can solve the problem of negative electrode lithium dendrite growth and increase in interface impedance, poor ionic conductivity of diaphragm, poor interface contact, etc. problems, to achieve the effect of high electrochemical decomposition voltage, excellent film-forming properties, and good mechanical strength

Inactive Publication Date: 2020-04-28
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor ion conductivity of the diaphragm, poor interface contact, difficulty in battery assembly, and the growth of lithium dendrites on the negative electrode and increasing interface impedance in the current solid-state battery, thereby proposing a solid-state battery The in-situ preparation method, which uses the combination of functional ionic conductor ceramic composite separator and in-situ polyelectrolyte buf

Method used

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  • In-situ preparation method of solid-state battery
  • In-situ preparation method of solid-state battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Under the protective atmosphere of high-purity argon, the functional ionic conductor ceramic composite diaphragm was prepared, and the specific process was as follows:

[0035] Weigh 2g of the inorganic ceramic electrolyte, place it in a ball mill jar for dry milling, the ball milling speed is 300r / min, and the ball milling time is 30min, to obtain the oxide solid electrolyte powder. Mix the ball-milled inorganic ceramic electrolyte powder with the PVDF-HFP colloidal liquid at a mass ratio of 92:8, and stir evenly to obtain the inorganic ceramic electrolyte+PVDF-HFP mixed slurry. Under the protective atmosphere of high-purity argon, the mixed slurry is wet-coated on a 0.05mm base film with a coating thickness of 0.1mm, and then the base film is placed on a heating plate for heating and drying , the heating temperature is 60°C, and the heating time is 12h, and a functional ion conductor ceramic composite diaphragm is prepared for use.

[0036] Under the protective atmos...

Embodiment 2

[0040] Under the protective atmosphere of high-purity argon, the functional ionic conductor ceramic composite diaphragm was prepared, and the specific process was as follows:

[0041] Weigh 2g of the inorganic ceramic electrolyte, place it in a ball mill jar for dry milling, the ball milling speed is 200r / min, and the ball milling time is 60min, to obtain the oxide solid electrolyte powder. The ball-milled inorganic ceramic electrolyte powder and PVDF-HFP colloidal liquid were mixed at a mass ratio of 85:15, and stirred evenly to obtain an inorganic ceramic electrolyte+PVDF-HFP mixed slurry. Under the protective atmosphere of high-purity argon, the mixed slurry is wet-coated on a 0.05mm base film with a coating thickness of 0.1mm, and then the base film is placed on a heating plate for heating and drying , the heating temperature is 50°C, and the heating time is 24h, and a functional ionic conductor ceramic composite diaphragm is prepared for use.

[0042] Under the protectiv...

Embodiment 3

[0046] Under the protective atmosphere of high-purity argon, the functional ionic conductor ceramic composite diaphragm was prepared, and the specific process was as follows:

[0047] Weigh 2g of the inorganic ceramic electrolyte, place it in a ball mill jar for dry milling, the ball milling speed is 200r / min, and the ball milling time is 60min, to obtain the oxide solid electrolyte powder. The ball-milled inorganic ceramic electrolyte powder and PVDF-HFP colloidal liquid were mixed in a mass ratio of 90:10, and stirred evenly to obtain a mixed slurry of inorganic ceramic electrolyte + PVDF-HFP. Under the protective atmosphere of high-purity argon, the mixed slurry is wet-coated on a 0.05mm base film with a coating thickness of 0.1mm, and then the base film is placed on a heating plate for heating and drying , the heating temperature is 50°C, and the heating time is 24h, and a functional ionic conductor ceramic composite diaphragm is prepared for use.

[0048] Under the prote...

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Abstract

The invention relates to an in-situ preparation method of a solid-state battery. A common diaphragm is replaced by a functional ion conductor ceramic composite diaphragm, a polymer monomer, lithium salt and an electrolyte additive are used as an electrolyte precursor and introduced into a network structure formed by the functional ion conductor ceramic composite diaphragm, and the solid-state battery is prepared in situ through interface regulation and optimization. The functional ion conductor ceramic composite diaphragm is prepared from an inorganic ceramic electrolyte and a vinylidene fluoride-hexafluoropropylene polymer colloid fluid in proportion, and is obtained by a wet coating mode. According to the invention, the functional ion conductor ceramic composite diaphragm with an ionic conduction sub-network is combined with the electrolyte precursor capable of being subjected to ring-opening polymerization, and a battery interface is regulated, controlled and optimized, so that theeffects of improving the ionic conductivity, stabilizing the battery interface, improving physical contact, preventing side reaction, promoting uniform deposition of lithium and inhibiting growth of lithium dendrites are achieved, the rate capability of the solid-state battery is effectively improved, and the cycle life of the solid-state battery is effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of solid-state lithium batteries, and in particular relates to an in-situ preparation method of a solid-state battery. Background technique [0002] In traditional lithium-ion batteries, most of them use liquid electrolytes, which have problems such as easy leakage, volatilization, flammability, and poor safety, which hinder the improvement of battery performance. [0003] In recent years, solid-state lithium-ion batteries have developed rapidly, and have unique advantages in safety, energy density, and inhibition of lithium dendrites, and have become the only way for the development of lithium batteries in the future. The solid electrolyte replaces the electrolyte and the diaphragm, plays the role of conducting ions and blocking electrons, and has the unique advantages of high safety and simple structure; at the same time, the high electrochemical stability of the solid electrolyte makes it better than high...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/0525H01M10/058H01M10/42
CPCH01M10/058H01M10/0525H01M10/4235H01M50/446H01M50/449Y02E60/10Y02P70/50
Inventor 赵冬梅李杨桑林丁飞刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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