Method for preparing heat-resistant liquid-holding lithium battery diaphragm
A lithium battery separator, heat-resistant technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of poor wettability, shorten battery life, accelerate lithium-ion battery damage, etc., and achieve the effect of strong heat resistance
Inactive Publication Date: 2019-05-21
江苏奔拓电气科技有限公司
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The invention discloses a method for preparing a heat-resistant liquid-holding lithium battery diaphragm and belongs to the technical field of lithium battery preparation. The battery diaphragm is mainly composed of aluminium oxide and silicon dioxide, the melting points of which are both above 1000 DEG C, the produced heat and the increased temperature are low during battery charging and discharging and the pore structure of the battery diaphragm is not influenced by high temperature expansion, so that the battery diaphragm has strong heat resistance; a shorter channel can be provided for ionconduction and the ion resistance is reduced by utilizing an aluminium oxide membrane with high porosity and a through-pore structure in the lithium battery diaphragm, so that the electrochemical performance is improved; and calcium lignosulfonate and acrylamide are grafted to obtain a graft copolymer and the graft copolymer is modified by dimethylamine and formaldehyde and reacted with N-vinyl pyrrolidone to obtain an amphoteric graft copolymer which can serve as an organic hygroscopic material to improve the wettability of the battery diaphragm to an electrolyte, so that the liquid absorption rate and the liquid-holding rate of a lithium battery are increased; and therefore, the lithium battery diaphragm has a broad application prospect.
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