Composite electrolyte of sandwich structure and preparation method thereof

A composite electrolyte and sandwich technology, applied in the direction of electrolytes, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of low conductivity and poor interface performance of all solid electrolytes, and achieve the effect of simple preparation process, good flexibility and environmental friendliness

Inactive Publication Date: 2017-11-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the technical problems of poor interface performance and low conductivity of exis

Method used

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  • Composite electrolyte of sandwich structure and preparation method thereof
  • Composite electrolyte of sandwich structure and preparation method thereof
  • Composite electrolyte of sandwich structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) DMF and DMK are formulated into a mixed solution according to the mass ratio of 1:1 for later use, and an appropriate amount of PVDF powder is added to the above mixed solution to make a solution with a PVDF mass fraction of 17%, and stirred at 60°C for 12 hours to obtain a uniform transparent mixed solution;

[0025] (2) At an injection speed of 1.5ml / h, a spinning voltage of 18kv, electrospinning is carried out under the conditions of using a roller to receive (roller speed 800r / min);

[0026] (3) After spinning, put the electrospun film into an oven, and dry it at 60° C. for 3-48 hours to completely volatilize the solvent. The obtained film is standby;

[0027] (4) Take 1g PEO, 0.3g LiClO 4 Put into 10-25ml ACN and stir well to form a homogeneous solution, divide into four parts and add a certain amount of LLTO nanofibers (LLTO NWs) to it to make a mixed solution with a mass fraction of LLTO NWs of 5%, and stir fully at room temperature;

[0028] (5) Put the m...

Embodiment 2

[0032] (1) DMF and DMK are formulated into a mixed solution according to the mass ratio of 1:1 for later use, and an appropriate amount of PVDF powder is added to the above mixed solution to make a solution with a PVDF mass fraction of 17%, and stirred at 60°C for 12 hours to obtain a uniform transparent mixed solution;

[0033] (2) At an injection speed of 1.5ml / h, a spinning voltage of 18kv, electrospinning is carried out under the conditions of using a roller to receive (roller speed 800r / min);

[0034] (3) After spinning, put the electrospun film into an oven, and dry it at 60° C. for 3-48 hours to completely volatilize the solvent. The obtained film is standby;

[0035] (4) Take 1g PEO, 0.3g LiClO 4 Put it into 10-25ml ACN and stir well to form a homogeneous solution, divide it into four parts and add a certain amount of LLTO nanofibers (LLTO NWs) to it to make a mixed solution with a mass fraction of LLTO NWs of 10%, and stir fully at room temperature;

[0036] (5) Pu...

Embodiment 3

[0040] (1) DMF and DMK are formulated into a mixed solution according to the mass ratio of 1:1 for later use, and an appropriate amount of PVDF powder is added to the above mixed solution to make a solution with a PVDF mass fraction of 17%, and stirred at 60°C for 12 hours to obtain a uniform transparent mixed solution;

[0041] (2) At an injection speed of 1.5ml / h, a spinning voltage of 18kv, electrospinning is carried out under the conditions of using a roller to receive (roller speed 800r / min);

[0042] (3) After spinning, put the electrospun film into an oven, and dry it at 60°C for 3-48 hours to completely volatilize the solvent. The obtained film is standby;

[0043] (4) Take 1g PEO, 0.1-0.3g LiClO 4Put into 10-25ml ACN and stir well to form a homogeneous solution, divide into four parts and add a certain amount of LLTO nanofibers (LLTO NWs) to it to make a mixed solution with a mass fraction of LLTO NWs of 15%, and stir fully at room temperature;

[0044] (5) Put the...

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Abstract

The invention relates to a composite electrolyte of a sandwich structure and a preparation method thereof. The technical problems of poor interface performance and low conductivity of the existing all solid electrolyte are solved. The composite electrolyte comprises a porous thin film and a composite solid electrolyte material, the porous thin film is adhered on two sides of the composite solid electrolyte material, the porous thin film is composed of a high-molecular polymer, and the porous thin film adsorbs liquid electrolyte. The invention further provides a preparation method of the composite electrolyte. The composite electrolyte can be widely applied to the field of preparation of electrolyte.

Description

technical field [0001] The invention relates to the field of lithium-ion battery solid electrolytes, in particular to a composite electrolyte with a sandwich structure and a preparation method thereof. Background technique [0002] With the application of lithium-ion batteries in the field of energy storage, the safety of batteries has become the focus of attention. Most lithium-ion batteries currently use organic liquid electrolytes. The leakage and flammability of organic liquid electrolytes threaten the safety of batteries. In order to solve this problem, solid-state electrolytes came into being. The current solid-state electrolytes can be divided into polymer gel electrolytes, polymer all-solid-state electrolytes, and inorganic solid-state electrolytes. [0003] Polymer solid electrolytes have gradually become the focus of attention because they do not have the disadvantages of flammability and leakage of organic liquid electrolytes, and they also have certain flexibi...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0566H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/0566H01M2300/0065H01M2300/0094Y02E60/10
Inventor 李昊于运花兰金叻杨小平
Owner BEIJING UNIV OF CHEM TECH
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