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

A technology of lithium-ion batteries and polymers, which is applied in the manufacture of electrolyte batteries, solid electrolytes, non-aqueous electrolytes, etc., can solve the problems of low lithium ion migration number, low ion conductivity, and low production cost, so as to improve the migration rate, Effect of high ionic conductivity and low production cost

Inactive Publication Date: 2016-05-25
上海德朗能动力电池有限公司 +1
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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

Method used

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

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Embodiment 1

[0037] 1) Dissolving 65 parts by weight of corn porous starch in distilled water at 30 degrees Celsius in a reaction kettle to form a solution, then heating up to 80 degrees Celsius, adding 2 parts of sodium hydroxide for pregelatinization treatment, and obtaining porous starch sol;

[0038]2) Add 2 parts by weight of sodium borate and 5 parts by weight of methanol to the porous starch sol obtained in step 1), fully stir and mix for 30 minutes to obtain a casting solution, and scrape it on a glass plate after vacuum defoaming treatment. Naturally solidify for 2 hours, and after film formation, place it in an oven heated to 50 degrees Celsius for 1 hour to volatilize the pore-forming agent to obtain a porous starch film;

[0039] 3) Immerse the porous starch film obtained in step 2) into an irradiation tube containing 5 parts by weight of a polyurethane modifier, perform graft modification treatment for 40 minutes under the condition of ultraviolet radiation, and take out the mo...

Embodiment 2

[0042] 1) Dissolving 80 parts by weight of potato porous starch in distilled water at 30 degrees Celsius in a reaction kettle to form a solution, then heating up to 75 degrees Celsius, adding 4 parts of sodium hydroxide for pregelatinization treatment, to obtain porous starch sol;

[0043] 2) Add 5 parts by weight of thiazole coagulant accelerator and 10 parts by weight of ethanol to the porous starch sol obtained in step 1), stir and mix for 60 minutes to obtain a casting solution, and scrape it on a glass plate after vacuum defoaming treatment 3 hours of natural solidification, and after the film is formed, place it in an oven heated to 80 degrees Celsius for 2 hours to volatilize the pore-forming agent to obtain a porous starch film;

[0044] 3) Immerse the porous starch film obtained in step 2) into an irradiation tube containing 3 parts by weight of a polycarboxylate modifier, and carry out graft modification treatment for 20 minutes under the condition of low-temperature ...

Embodiment 3

[0047] 1) Dissolving 70 parts by weight of konjac porous starch in distilled water at 40 degrees Celsius in a reaction kettle to form a solution, then warming up to 70 degrees Celsius, adding 3 parts of sodium hydroxide for pregelatinization treatment to obtain porous starch sol;

[0048] 2) Add 2-5 parts by weight of diphenylguanidine coagulant and 10 parts by weight of propanol to the porous starch sol obtained in step 1), and fully stir and mix for 40 minutes to obtain the casting solution. After vacuum defoaming treatment Scratch coating on a glass plate, let it solidify naturally for 3 hours, and place it in an oven heated to 80 degrees Celsius for 1 hour after forming a film to volatilize the pore-forming agent to obtain a porous starch film;

[0049] 3) Immerse the porous starch film obtained in step 2) into an irradiation tube containing 4 parts by weight of a polyether modifier, perform graft modification treatment for 40 minutes under the condition of high-energy ray ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/058
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10Y02P70/50
Inventor 陈庆李兴文
Owner 上海德朗能动力电池有限公司
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