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Diaphragm, and preparation method and application thereof

A diaphragm and zeolite imidazolate technology, which is applied in the field of diaphragm and its preparation, can solve the problems of not increasing the liquid retention of electrolyte and the complicated preparation of diaphragm, and achieve the effect of good battery cycle performance and good battery rate performance

Pending Publication Date: 2021-11-19
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It proves that MOFs / organic composite separator is a promising battery separator material, which opens up a new way to improve the safety of lithium-ion batteries. The disclosed separator is complicated to prepare and does not improve the liquid retention of the electrolyte.

Method used

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  • Diaphragm, and preparation method and application thereof
  • Diaphragm, and preparation method and application thereof
  • Diaphragm, and preparation method and application thereof

Examples

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Embodiment 1

[0037] This embodiment provides a diaphragm, which includes a diaphragm base layer (thickness is 4 μm, polyethylene, purchased from Chongqing Newmi, brand is H-HP5) and zeolite imidazolate coating (thickness is 2 μm);

[0038] The material of the zeolite imidazolate coating comprises the following components in parts by weight: 80 parts of ZIF-67 (D50 particle diameter is 1 μm, purchased from Xianfeng Nano, the trade mark is XFF15), 6.6 parts of wetting agent (mass ratio of 1:1 sodium dodecylbenzene sulfonate and fatty alcohol polyoxyethylene ether), 6.7 parts of thickener (sodium carboxymethylcellulose, purchased from Nippon Paper, the brand is MAC500LC) and 6.7 parts of binder (Acrylic adhesive, purchased from Indile, the brand is LA168B).

[0039] The preparation method of above-mentioned diaphragm comprises the steps:

[0040](1) Dissolve the first wetting agent (sodium dodecylbenzene sulfonate) in water, then mix the obtained wetting agent solution with ZIF-67, thickener...

Embodiment 2-5

[0043] The difference between Examples 2-5 and Example 1 is that the D50 particle sizes of ZIF-67 are 0.5 μm, 0.8 μm, 0.25 μm and 1.2 μm respectively, and the rest are the same as Example 1.

Embodiment 6-9

[0045] The difference between Examples 6-9 and Example 1 is that the thicknesses of the zeolite imidazolate coatings are 1 μm, 10 μm, 0.5 μm and 15 μm respectively, and the rest are the same as Example 1.

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Abstract

The invention relates to a diaphragm, and a preparation method and application thereof. The diaphragm comprises a diaphragm base layer and a zeolite imidazate coating arranged on the upper surface of the diaphragm base layer; and the zeolite imidazate coating is prepared from, by weight, 55 to 90 parts of ZIF-67, 0.1 to 15 parts of a wetting agent, 0.1 to 15 parts of a thickening agent and 0.1 to 15 parts of a binding agent on the basis that the total weight part of the material of the zeolite imidazate coating is 100 parts. On the premise that the diaphragm base material is thin, the diaphragm provided by the invention has high thermal stability and excellent electrolyte retention capacity.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a diaphragm, its preparation method and application. Background technique [0002] At present, the requirements for fast charging performance and capacity density of lithium-ion batteries are gradually increasing, and it is very important to develop lithium-ion batteries with fast charging capabilities and large capacity density. As the four main materials of lithium-ion batteries, the performance of the separator will directly affect the safety of the battery. Optimize battery performance. [0003] CN109950455A discloses a preparation method of a modified diaphragm for a lithium-sulfur battery. The disclosed method is to coat a layer of acidified multi-walled carbon nanotube-coated mesoporous carbon composite material on the surface of the diaphragm substrate; the disclosed composite material Mesoporous carbon and acidified multi-walled carbon nanotubes have carboxyl groups,...

Claims

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Application Information

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IPC IPC(8): H01M50/449H01M50/414H01M50/411H01M50/403H01M10/0525H01M10/0587
CPCH01M50/449H01M50/414H01M50/411H01M50/403H01M10/0525H01M10/0587Y02P70/50Y02E60/10
Inventor 李欣陈辉岳娟徐嘉辉
Owner 东莞维科电池有限公司
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