A kind of starch-based polymer electrolyte for lithium ion battery and preparation method thereof

Abstract

The invention relates to a starch-based polymer electrolyte for a lithium-ion battery and a preparation method thereof. Specifically, the porous starch is subjected to pregelatinization treatment, and then a porous starch film is made under the action of a coagulant and a pore-forming agent. , the starch film not only has a porous structure on the film, but also has a porous structure inside the starch granules that make up the film; then graft groups that can complex with lithium ions on the pore walls of the two types of pores that the porous starch film has , and finally immersed in the lithium salt solution for complexation reaction, taken out and dried to obtain a starch-based polymer electrolyte membrane for lithium batteries. Excellent performance, low production cost, easy industrial production, and has its application value.

Description

technical field [0001] The invention relates to the field of lithium battery materials, in particular to a starch-based polymer electrolyte for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion battery is one of the secondary batteries with the most development potential nowadays. It has the characteristics of high working voltage, high energy density, long charge and discharge life, small self-discharge, small size, no memory effect, and environmental protection. Although lithium-ion batteries have been widely used in many fields such as military defense, electric vehicles, and portable digital devices, the requirements for their performance are also getting higher and higher, especially in terms of safety, specific energy, high and low temperature. The deficiencies in performance and cycle stability still need to be improved and improved. With people's emphasis on and development of lithium-ion batteries, the selection and p...

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Problems solved by technology

[0007] In view of the low ion conductivity, low lithium ion migration number and poor mechanical strength of the current starch polymer electrolyte, a starch-based polymer electrolyte for lithium ion batteries and a preparation method thereof are proposed. In order to achieve the above object, the present invention The porous starch is pregelatinized first, and then made into a porous starch film under the action of a coagulant and a pore-forming agent. The starch film not only has a porous structure on the film, but also has a porous structure inside the starch granules that make up the film. ; Then graft the groups that can complex with lithium ions on the pore walls of the two kinds of pores that the porous starch film has, and finally immerse in the solution of lithium salt for complexation reaction, take out and dry to obtain a lithium battery Using starch-based polymer electrolyte membrane, the polymer electrolyte not only has high ionic conductivity and movable lithium ion density, but also has excellent mechanical properties and low production cost

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