Nano-modified lithium ion battery membrane, manufacturing method thereof and product containing same

A lithium-ion battery and nano-modification technology, which is applied in the preparation of lithium-ion battery diaphragms and the preparation of nano-modified lithium-ion battery diaphragms, can solve problems affecting the use of diaphragms and poor wettability, and achieve increased liquid absorption efficiency and reduced Small charge transfer resistance, the effect of not increasing the original size

Active Publication Date: 2019-03-29
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the current method of modification with cyclodextrin generally suffers from poor wettability of the diaphragm in the modified solution, which cannot neutralize the free hydrofluoric acid in the electrolyte, and the thickness of the modified layer changes the thickness of the diaphragm itself, affecting the diaphragm. Questions about the further use of

Method used

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  • Nano-modified lithium ion battery membrane, manufacturing method thereof and product containing same
  • Nano-modified lithium ion battery membrane, manufacturing method thereof and product containing same

Examples

Experimental program
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Effect test

Embodiment 1

[0059] This embodiment provides a preparation method of a nano-modified lithium-ion battery separator, such as figure 1 shown, including the following steps:

[0060] Preparation of cyclodextrin polyrotaxane inclusion compound: at room temperature, add 10 mL of 100 mg / mL polyethylene glycol diamine (molecular weight: 1000) aqueous solution into saturated cyclodextrin aqueous solution, stir well and then let it stand 10min; filter and dry the obtained precipitate, then dissolve it in dimethylacetamide and add 1g of 2,4-dinitrofluorobenzene for stirring to prevent the decomposition of cyclodextrin polyrotaxane inclusion complex; Add 1mL of ether to terminate the reaction and obtain a precipitate; wash the precipitate with ether to remove unreacted 2,4-dinitrofluorobenzene, and use dimethylacetamide to remove unreacted cyclodextrin, poly Derivatives of ethylene glycol diamine and dinitrobenzene;

[0061] Preparation of cyclodextrin molecular tube inclusion compound: Take 1 g of...

Embodiment 2

[0065] This embodiment provides a preparation method of a nano-modified lithium-ion battery diaphragm, comprising the following steps:

[0066] Preparation of cyclodextrin polyrotaxane clathrate: at room temperature, add 15 mL of 70 mg / mL polyethylene glycol diamine (molecular weight: 3350) aqueous solution into saturated cyclodextrin aqueous solution, stir well and let stand 5min; the obtained precipitate was filtered and dried, then dissolved in 50mL aqueous solution with a concentration of 2mg / mL dimethylacetamide and stirred by adding 1g of 2,4-dinitrofluorobenzene to prevent cyclodextrin aggregation Decomposition of rotaxane clathrates; add 1 mL of ether to terminate the reaction and obtain a precipitate; wash the precipitate with ether to remove unreacted 2,4-dinitrofluorobenzene, and use dimethylacetamide to remove Derivatives of cyclodextrin, polyethylene glycol diamine and dinitrobenzene that have not participated in the reaction;

[0067] Preparation of cyclodextrin...

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Abstract

The invention provides a nano-modified lithium ion battery membrane, a manufacturing method thereof and a product containing the same. The manufacturing method comprises: preparing an organic sodium salt inclusion compound of a cyclodextrin molecular tube; and immersing a membrane which needs modification in an alkali solution of an organic sodium salt inclusion compound of the cyclodextrin molecular tube. The invention also provides a nano-modified lithium ion battery membrane obtained by the manufacturing method and a product containing the same. The membrane has high electrolyte wetting property and strong adhesion, and can neutralize unbonded hydrofluoric acid in the electrolyte, has high cycle performance, high capacity and can improve battery safety.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery diaphragm, in particular to a preparation method of a nano-modified lithium-ion battery diaphragm, and belongs to the technical field of lithium-ion battery preparation. Background technique [0002] In lithium-ion batteries, the separator is a very important component. Its main function is to physically separate the positive and negative electrodes and prevent the passage of electrons so as not to cause a short circuit, while allowing the conduction of lithium ions. The performance of the separator directly determines the internal resistance of the battery, the adsorption of the electrolyte, the conduction of lithium ions, etc., which greatly affects the electrochemical performance and safety performance of the battery. The traditional polyolefin separator has poor electrolyte wettability, low electrolyte absorption and liquid retention rate, resulting in poor cycle and rate perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525B82Y30/00H01M50/403H01M50/409H01M50/489
CPCH01M10/0525B82Y30/00H01M50/403H01M50/411Y02E60/10
Inventor 李智陈萌柳盼盼谢玉虎
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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