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A method for preparing thin film lithium battery solid electrolyte by molecular film formation

A technology for solid electrolytes and lithium batteries, applied in solid electrolytes, non-aqueous electrolytes, secondary batteries, etc., can solve the problems of cumbersome process, expensive preparation equipment, low film production efficiency, etc., achieve simplified preparation process, and more charge and discharge times , The effect of short film forming time

Inactive Publication Date: 2017-12-08
CHONGQING ACADEMY OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods will have problems such as expensive preparation equipment, cumbersome process, and low film production efficiency. Therefore, how to develop a method that does not require a substrate to prepare solid-state thin films is an effective means to promote technological development.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take PEG (polyethylene glycol), PEO (polyethylene oxide), LiClO 4 Three kinds of raw materials, the ratio of the three kinds of raw materials is 3:6:1, add a certain proportion of acetonitrile to dissolve completely, and then set aside for 1-2 days to ensure that the solid matter is completely dissolved, and named it A solution.

[0019] Take a clean evaporating dish, add 5-8mL glycerin (glycerol), when the glycerin level is level, slowly add solution A, place it on a horizontal table, and a film can be formed within 1 hour. Leave the above film for 1 day, take out the film and remove the glycerin, put it on a clean filter paper, and dry it in a drying oven at a low temperature, the temperature should not be higher than 50°C, to obtain a solid electrolyte film.

[0020] Performance Testing:

[0021] Cut about 1cm 2 The electrolyte film was placed in the battery case to test the AC impedance of the prepared material. It was found by impedance spectroscopy that the cond...

Embodiment 2

[0023] Take PEG (polyethylene glycol), PEO (polyethylene oxide), LiNO3 (lithium nitrate) three raw materials, 30:55:15, add a certain proportion of acetonitrile to dissolve completely, and then set aside for 1-2 days to ensure that the solid substance Completely dissolved, named A solution.

[0024] Take a clean evaporating dish, add 5-8mL glycerin (glycerol), when the glycerin level is level, slowly add solution A, place it on a horizontal table, and a film can be formed within 1 hour. Leave the above film for 1 day, take out the film and remove the glycerin, put it on a clean filter paper, and dry it in a drying oven at a low temperature, the temperature should not be higher than 50°C, to obtain a solid electrolyte film.

[0025] Performance Testing:

[0026] Cut about 1cm 2 The electrolyte film was placed in the battery case to test the AC impedance of the prepared material. It was found by impedance spectroscopy that the conductivity of the solid electrolyte film at room...

Embodiment 3

[0028] Take PPS (polystyrene), PEO (polyethylene oxide), LiClO4 three raw materials, the ratio of the three raw materials is 25:60:15, add a certain proportion of acetonitrile to dissolve completely, and then set aside for 1-2 days to ensure solid The substance was completely dissolved and named as A solution.

[0029] Take a clean evaporating dish, add 5-8mL glycerin (glycerol), when the glycerin level is level, slowly add solution A, place it on a horizontal table, and a film can be formed within 1 hour. Leave the above film for 1 day, take out the film and remove the glycerin, put it on a clean filter paper, and dry it in a drying oven at a low temperature, the temperature should not be higher than 50°C, to obtain a solid electrolyte film.

[0030] Performance Testing:

[0031] Cut about 1cm 2 The electrolyte film was placed in the battery case to test the AC impedance of the prepared material. It was found by impedance spectroscopy that the conductivity of the solid elec...

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Abstract

The invention discloses a method for preparing a solid electrolyte of a thin-film lithium battery by adopting molecular film forming. The method comprises the following steps: 1) raw materials including a plasticizer, polyethylene oxide, PEG (polyethylene glycol) and lithium salt are taken, acetonitrile is added to guarantee complete dissolution of solid substances, and then the mixture is left to stand for 1-2 days and named as solution A; 2) a proper amount of glycerin is added to a container, then the solution A is added slowly, the mixture is left to stand, a thin film is formed by the solution and left to stand for 1 day, the thin film is dried at the temperature of 0-50 DEG C, and a solid electrolyte film is obtained. According to the method, the size, shape and thickness of the solid electrolyte can be controlled accurately by means of design of the glycerin container, the solid electrolyte film is synthesized in one step with a molecular diffusion film forming method, attachment to other substances is not needed, the film forming time is short, the quality of the formed film is stable, the operation is simple, and scale production is facilitated. The charge and discharge performance of the lithium battery prepared from the solid electrolyte is stable, and the lithium battery has the characteristics of long service life, large number of charge and discharge times, high battery capacity and the like.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a method for preparing a thin-film lithium battery solid electrolyte. Background technique [0002] With the advancement of science and technology and the discovery of new materials, people have developed various types of batteries. With the advent of portable electrical appliances such as mobile phones and notebook computers, the demand for high performance and small and lightweight batteries is becoming more and more Strongly, in order to meet this demand, lithium-ion batteries have gradually attracted people's attention due to their high energy density and rapid charging, and have also been widely used. In electrochemical components such as primary batteries or secondary batteries and capacitors, liquid electrolytes are mostly used as conductive raw materials for manufacturing new batteries, but liquid electrolytes have the disadvantages of risk of liquid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565
CPCH01M10/0565H01M2300/0082Y02E60/10
Inventor 王联杨亚萍薛雯娟周天勇钟江泉蒋显全袁先洪
Owner CHONGQING ACADEMY OF SCI & TECH