Lithium battery diaphragm with stable performance
A lithium battery diaphragm, a stable technology, applied in the direction of battery components, circuits, electrical components, etc., can solve the problems of low capacity utilization, immature wet diaphragm technology, etc., and achieve the effect of improving safety
Inactive Publication Date: 2015-12-23
孙晨
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AI Technical Summary
Problems solved by technology
The capacity utilization rate of the domestic diaphragm industry is low, and its applications are mainly concentrated in low-end fields. High-end applications such as power lithium batteries mainly rely on imports. The price of dry-process diaphragms has dropped by about 70% compared with three years ago, and the gross profit rate has dropped to about 25%. French diaphragm technology is not yet mature
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0020] A lithium battery separator with stable performance is made of the following components in parts by weight: 5 parts of polyvinyl alcohol, 80 parts of polypropylene, 0.5 parts of carbon fiber, 2 parts of polyethylene wax, and 5 parts of modified tetrachloroethylene;
[0021] The preparation method of above-mentioned diaphragm is as follows:
[0022] 1) Weighing by the above parts by weight: polyvinyl alcohol, polypropylene, carbon fiber, polyethylene wax, modified tetrachloroethylene;
[0023] 2) The raw materials in step 1) are mixed, heated, fed into an extruder to be melted and extruded, and then cooled and cast into a thick sheet on a casting roll;
[0024] 3) preheating and stretching the slab in step 2), cooling and tempering after completion, and making a film;
[0025] 4) Rewinding the shaped film in step 3), large and small cutting, and then packaging to form a lithium battery diaphragm.
[0026] The above-mentioned modified tetrachlorethylene is made from the...
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The invention relates to a lithium battery diaphragm with a stable performance. The diaphragm is prepared from the following components in parts by weight: 5 parts of polyvinyl alcohol, 80 parts of polypropylene, 0.5 part of carbon fiber, 2 parts of polyethylene wax and 5 parts of modified tetrachloroethylene, wherein the modified tetrachloroethylene is prepared from the following raw materials: 100 parts of tetrachloroethylene, 2 parts of purple sweet potato anthocyanin, 0.2 part of rare earth oxides, 0.2 part of polyphosphoric acid and 0.2 part of polyvinylpyrrolidone. A preparation method of the modified tetrachloroethylene comprises: uniformly stirring and mixing the tetrachloroethylene, purple sweet potato anthocyanin, rare earth oxides, polyphosphoric acid and polyvinylpyrrolidone; and carrying out mixed melting and extruding pelletization to obtain the modified tetrachloroethylene. By adding the modified tetrachloroethylene, the problem of transverse shrinkage which is hard to change in a conventional biaxial stretching technology is overcome, transverse shrinkage is prevented, and the safety of the biaxial stretching diaphragm is greatly improved. PP / PE can be used as a raw material, so that the production process is free of pollution to the environment.
Description
technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery diaphragm with stable performance. Background technique [0002] Lithium battery separator is a supporting material for batteries encouraged by the state. Since the beginning of the 21st century, energy has increasingly become a bottleneck restricting my country's economic and social development. In order to achieve rapid economic growth and sustainable social development in China, there is an urgent need to develop new energy and energy materials. The battery industry is an important part of the new energy field, which is related to the realization of the sustainable development strategy. The new material of battery diaphragm is the main force in developing energy technology, improving energy production and utilization efficiency, and has become a new hot spot in global economic development. [0003] At present, only a few countries such as Japan an...
Claims
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IPC IPC(8): C08L23/12C08L29/04C08L23/06C08K7/06C08K9/02C08K9/04C08K5/02H01M2/16H01M50/403H01M50/417H01M50/426H01M50/44
CPCC08L23/12C08L2205/03C08L2203/16H01M50/446C08L29/04C08L23/06C08K7/06C08K9/02C08K9/04C08K5/02Y02E60/10
Inventor 孙晨
Owner 孙晨