A kind of composite diaphragm with coating, preparation method and application
A composite diaphragm and coating technology, which is applied in the direction of coating, structural parts, battery pack parts, etc., can solve the problems of the high temperature resistance performance of the ceramic coating diaphragm, the mechanical strength of the ceramic coating diaphragm, and the ceramic particles are easy to fall off, etc. , to achieve fast conduction rate, improve the overall comprehensive performance, and improve the effect of peel strength
Active Publication Date: 2021-11-23
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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- Description
- Claims
- Application Information
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Problems solved by technology
However, as an inorganic material, ceramics have a high density, and there is no stress conduction between ceramic particles, so that the mechanical strength of the ceramic coating diaphragm is seriously reduced; and the compatibility of the inorganic material of the ceramic particles with the base film of the organic diaphragm is poor, so that the ceramic particles are easy to fall off, that is, The powder falls off, which reduces the high temperature resistance of the ceramic coating separator and affects the performance of the battery
Method used
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Embodiment 1
[0032] In this example, a polypropylene microporous membrane with a thickness of 16 μm, a porosity of 40%, and a pore size of 0.02-0.03 μm was used as the base membrane; the nanocellulose crystals used were purchased from the Canadian Pulp and Paper Research Institute , the nanocellulose crystals are 0.05-2 μm in length and 0.001-0.04 μm in diameter. The preparation method of the composite membrane of this example is as follows:
[0033] 1. Preparation of surface-grafted polyethylene glycol nanocellulose crystals
[0034] Disperse nanocellulose crystals in water, add TEMPO oxidant and cocatalyst, react at 20°C-60°C for 1-4 hours, wash and dry the reaction product to obtain nanocellulose crystals with carboxyl groups on the surface; Mix nanocellulose crystals with carboxyl groups and polyethylene glycol with amino groups at the end groups, stir and react at 20°C-50°C for 1-8 hours, and then wash with water to obtain nanocellulose crystals grafted with polyethylene glycol on th...
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Abstract
The application discloses a composite diaphragm with a coating, a preparation method and an application. The composite diaphragm of the present application includes a base film and a high temperature resistant coating coated on at least one surface of the base film, and the high temperature resistant coating is formed by coating the surface with nano-cellulose crystals grafted with polyethylene glycol. The composite diaphragm of the present application creatively uses nano-cellulose crystals grafted with polyethylene glycol on the surface to prepare a high-temperature-resistant coating. The interfacial bonding force between the nano-cellulose crystals and the base film is better, which improves the overall peel strength of the composite diaphragm. While retaining the characteristics of high temperature resistance of the coating, it also solves the problems of coating peeling and powder dropping. Compared with ceramics, nanocellulose crystals grafted with polyethylene glycol on the surface have a better dispersion effect in water, making the composite separator more uniform. The coating formed by nano-cellulose crystals grafted with polyethylene glycol on the surface has a fast liquid conduction rate and strong liquid absorption capacity, and forms a gel after absorbing the electrolyte, so that the composite separator can be better attached to the electrode surface.
Description
technical field [0001] The application relates to the field of lithium-ion battery diaphragms, in particular to a composite diaphragm with a coating, a preparation method and an application. Background technique [0002] Lithium-ion battery separator is a porous membrane. The main function of the lithium-ion battery separator in the lithium-ion battery is to isolate the positive and negative electrodes of the battery to prevent the internal short circuit of the battery; to provide a channel for the migration of lithium ions during charging and discharging, and to allow lithium ions to pass through. The pre-commercialized diaphragms are mainly divided into dry-process unidirectional stretched diaphragms and wet-process biaxially stretched diaphragms. See patents US5480745, JP2004323820. [0003] In order to further improve the ability of the lithium battery separator to absorb electrolyte, improve the thermal stability of the separator and the ability to resist lithium dend...
Claims
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IPC IPC(8): H01M50/44H01M50/411H01M50/449H01M50/454H01M50/403H01M10/0525C08B15/00C08G81/00C08J7/04C08L23/06C08L23/12H01M50/414H01M50/491
CPCH01M10/0525C08B15/00C08G81/00C08J2323/06C08J2323/12C08J2401/08C08J7/0427H01M50/44H01M50/411H01M50/403H01M50/449Y02E60/10
Inventor 姚坤丁云海郑鹏曹志锋
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD