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Polymer composite solid electrolyte and preparation method thereof

A technology of solid electrolyte and composite materials, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of low ion conductivity and mechanical properties, large quantities, etc., achieve superior performance, reduce production costs, and avoid organic solvents The effect of the release

Inactive Publication Date: 2017-05-31
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing polyethylene oxide (PEO), polyacrylonitrile (PAN) and polymethyl methacrylate (PMMA)-based solid polymer electrolytes have low ionic conductivity and mechanical properties, and need to use A large amount of organic solvents has become the main factor restricting its development

Method used

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  • Polymer composite solid electrolyte and preparation method thereof

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Effect test

Embodiment 1

[0029] In this example, the preparation method of the polymer composite solid electrolyte is based on the aqueous solution casting method, and the steps are as follows:

[0030] a. Pour 600 parts of cold water into the reaction kettle, start the mixer, add 60 parts of polyvinyl alcohol with an alcoholysis degree of 88%, slowly raise the temperature to 90°C, and mix mechanically for 2 hours to obtain a uniform solution;

[0031] b. Cool down to 50°C, add 30 parts of lithium perchlorate, and stir for 2.5 hours to completely dissolve it in the aqueous solution of polyvinyl alcohol;

[0032] c. Continue to cool down to 40°C, slowly add 25 parts of an aqueous dispersion of silica nanoparticles (20% solid content), and mix for 3 hours under the joint action of ultrasonic waves and mechanical stirring;

[0033] d. Add 5 parts of water-dispersible polymeric isocyanate dropwise and stir for 15-30 minutes;

[0034] e. The above solution was poured into a polytetrafluoroethylene co...

Embodiment 2

[0037] This embodiment is basically the same as Embodiment 1, especially in that:

[0038] In this embodiment, the preparation method of polymer composite solid electrolyte, the steps are as follows:

[0039] a. Pour 600 parts of cold water into the reaction kettle, start the mixer, add 55 parts of polyvinyl acetate-ethylene emulsion (VAE) rubber powder, slowly raise the temperature to 60°C, and mix mechanically for 2 hours to obtain a uniform solution;

[0040] b. Cool down to 50°C, add 35 parts of lithium carbonate, and stir for 3 hours to completely dissolve in the VAE solution;

[0041] c. Continue to cool down to 30-40°C, slowly add 30 parts of nano-calcium carbonate aqueous dispersion (with a solid content of 20%), and mix for 2.5 hours under the joint action of ultrasonic waves and mechanical stirring;

[0042] d. Add 4 parts of water-dispersible polymeric polyisocyanate dropwise and stir for 15-30 minutes;

[0043] e. This step is identical with embodiment one; ...

Embodiment 3

[0046] This embodiment is basically the same as the previous embodiment, and the special features are:

[0047] In this embodiment, the preparation method of polymer composite solid electrolyte, the steps are as follows:

[0048] a. Pour 600 parts of cold water into the reaction kettle, start the mixer, add 50 parts of polyvinyl alcohol with an alcoholysis degree of 99% and 10 parts of carboxymethyl cellulose, slowly raise the temperature to 95°C, and mix mechanically for 2 hours to obtain a uniform solution;

[0049] b. Cool down to 50°C, add 30 parts of lithium sulfate, and stir for 2.5 hours to completely dissolve in the mixed aqueous solution of polyvinyl alcohol and carboxymethyl cellulose;

[0050] c. Continue to cool down to 30-40°C, slowly add 20 parts of nano-titanium dioxide aqueous dispersion (with a solid content of 20%), and mix for 3 hours under the joint action of ultrasonic waves and mechanical stirring;

[0051] d. Add 6 parts of high-functionality polyis...

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Abstract

The invention discloses a polymer composite material solid electrolyte and a preparation method thereof. The method for preparing a solid electrolyte by filling an aqueous polymer with inorganic nanoparticles and lithium salts and cross-linking with polyisocyanate belongs to the technical field of lithium ion batteries. Its characteristics are based on the aqueous solution casting method, using 60% to 80% of water-based polymers, 10% to 40% of lithium salts, 2.0% to 8.0% of inorganic nano fillers and 2.0% to 8.0% of polyisocyanate crosslinking agents to obtain electrolytes . The polymer composite material prepared by the method has the characteristics of high ionic conductivity, excellent mechanical properties and short relaxation time, and its molding process is simple and meets the requirements of environmental protection.

Description

technical field [0001] The invention relates to an electrolyte and a preparation method thereof, in particular to a composite material solid electrolyte and a preparation method thereof, which are applied in the technical field of lithium ion secondary batteries. Background technique [0002] As a green and efficient new energy source, lithium-ion batteries have the advantages of high voltage, high energy density, long cycle life, and no memory effect. They have been widely used in portable electronic devices such as mobile communications, notebook computers, and miniature cameras. Fields such as automotive power supplies, smart grid energy storage systems, micro-electromechanical systems, and aerospace have also shown good application prospects. Electrolyte is one of the core components of lithium batteries. It not only plays the role of conducting current and transporting ions between the positive and negative electrodes, but also determines the working mechanism of the ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/052H01M10/0565Y02E60/10Y02P70/50
Inventor 胡宏玖贺耀龙郭满霞刘昌黄大卫
Owner SHANGHAI UNIV
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