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High-infiltration lithium ion battery diaphragm

A lithium-ion battery, wettability technology, applied in the direction of battery pack components, circuits, electrical components, etc., can solve the problems of poor liquid retention performance, liquid absorption, and poor liquid retention performance, achieve good compatibility, improve absorption liquid effect

Active Publication Date: 2020-02-11
苏州欧纳克纳米科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of poor liquid absorption and liquid retention performance of lithium ion batteries, the present invention provides a composite diaphragm for lithium batteries with high wettability
The middle layer of the diaphragm is a polyethylene composite microporous membrane. Both sides of the polyethylene composite microporous membrane are polypropylene microporous membranes. Both sides of the polyethylene composite microporous membrane are coated with the same functional coating. The addition of the coating makes the diaphragm have good liquid absorption and liquid retention performance, which solves the problem of poor liquid absorption and liquid retention performance of lithium-ion batteries

Method used

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  • High-infiltration lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (a) First prepare maleic anhydride grafted hydroxypropyl-β-cyclodextrin, the preparation method is: completely dissolve 10g maleic anhydride with 15mL glacial acetic acid to form a mixed solution of maleic anhydride / glacial acetic acid, and weigh the pre-dried Add hydroxypropyl-β-cyclodextrin with a degree of substitution of 2.8 to 85 mL of glacial acetic acid solution to prepare a saturated solution. Under mechanical stirring, pass the obtained saturated solution of hydroxypropyl-β-cyclodextrin / glacial acetic acid through Add a constant pressure dropping funnel dropwise into the mixed solution of maleic anhydride / glacial acetic acid at a rate of 4-5d / s, add a certain amount of sodium acetate, stir and dissolve at 90°C for 6 hours, and wait for infrared detection at 1700cm -1 The asymmetric absorption peak of the anhydride on the maleic anhydride disappears, that is, the reaction is stopped, cooled to room temperature, the reactant is poured into 200mL distilled water, l...

Embodiment 2

[0045] Others are the same as in Example 1, except that the mass percentages of maleic anhydride grafted hydroxypropyl-β-cyclodextrin, zirconia, and PVA in ethanol solution in step (c) during the preparation process are: 30%, 10%, 1%;

[0046] In step (d), the total thickness of the functional coating on both sides of the polyethylene composite microporous membrane is 3 μm, and the others are the same as in Example 1.

Embodiment 3

[0048] Others are the same as in Example 1, except that the mass percentages of maleic anhydride grafted hydroxypropyl-β-cyclodextrin, zirconia, and PVA in ethanol solution in step (c) during the preparation process are: 30%, 10%, 1%;

[0049] In step (d), the total thickness of the functional coating on both sides of the polyethylene composite microporous membrane is 5 μm, and the others are the same as in Example 1.

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Abstract

The present invention relates to the technical field of lithium battery diaphragms, and in particular, to a composite diaphragm for high-infiltration lithium batteries. The invention, in view of the poor electrolyte absorption and liquid holding capacity of a lithium ion battery diaphragm, provides a high-infiltration lithium ion battery diaphragm. The outermost layer of the diaphragm is a polypropylene microporous membrane and the intermediate layer of the diaphragm is a polyethylene composite microporous membrane. Both sides of the polyethylene composite microporous membrane are coated withthe same functional coating. The functional coating is composed of maleic anhydride grafted hydroxypropyl-[beta]-cyclodextrin, nano-silica, an binder and ethyl alcohol. The technical scheme provided by the invention is simple in process and friendly to environment. The prepared composite diaphragm has good electrolyte absorption and electrolyte holding performance, air permeability and thermal stability.

Description

technical field [0001] The invention relates to the technical field of lithium battery diaphragms, in particular to a composite diaphragm for lithium batteries with high wettability. Background technique [0002] Lithium-ion battery is composed of positive electrode, negative electrode, diaphragm and electrolyte. Lithium-ion battery is a secondary battery with excellent performance. Energy density and wider operating temperature range, in addition, it also has the characteristics of small self-discharge, good cycle performance, no memory effect, green environmental protection, etc., which are favored by more and more people. As energy storage devices in computers, communications and consumer electronics And the rapid popularization in products such as transportation tools. [0003] With the rapid development of modern society and the improvement of living standards, people have higher and higher requirements for lithium-ion batteries, especially for the fast charging perfor...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14C08F251/00C08F222/06H01M50/417H01M50/446H01M50/457
CPCC08F251/00H01M50/431H01M50/403H01M50/411C08F222/06Y02E60/10
Inventor 张玉贞刘飞
Owner 苏州欧纳克纳米科技有限公司
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