A lithium secondary battery isolating film and lithium secondary battery using the same
A lithium secondary battery and separator technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as high cost and loss of battery function, improve safety, reduce manufacturing costs, and reduce electrode insertion. effect of phenomenon
Inactive Publication Date: 2007-04-11
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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- Application Information
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Problems solved by technology
However, controlling the relative humidity in the air to be less than 0.04% requires high cost, and it is still unavoidable to avoid a certain amount of water molecules remaining in the preparation process
In addition, after long-term use of lithium secondary batteries, water molecular gas penetration cannot be avoided, resulting in loss of battery function or battery safety issues.
Method used
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Embodiment Construction
[0017] As shown in Figure 1, the lithium secondary battery separator 124 of the first embodiment of the present invention includes a strong water-absorbing material-polymer composite material layer, this layer is based on a polymer material 12, the strong water-absorbing material has a dew point lower than - Strong water absorption at 56°C, the particle size ranges from 10 nanometers to 10 microns, dispersed in polymer materials, and the weight ratio of polymer materials 12 to strong water absorption materials is 1:4 to 3:4. The strong water-absorbing material includes molecular sieve 11, and the molecular sieve 11 can be zeolite molecular sieve or carbon molecular sieve, but not limited thereto, as long as it has strong water absorption, it is preferably 3A molecular sieve. The polymer material 12 is an organic polymer, such as one of polyethylene, polypropylene, polymethyl methacrylate, polyvinyl chloride, polyethylene glycol diacrylate, polyvinylrolidone, and polyvinylidene ...
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Abstract
The invention relates to a lithium secondary cell isolation film, at least including a strong water absorption material-high molecular composite layer, where the preferred strong water absorption material is molecular sieve. The strong water absorption material can completely absorb the residual and infiltration water in manufacturing process of the lithium secondary cell so as to prevent the poisoning of the lithium secondary cell or the reaction of lithium metal with the water, thus prolonging the service life. In addition, the proper combination of the strong water absorption material with the high-molecular composite can increase the mechanical strength of the isolation film and reduce the electrode penetration and thus it improves the safety of the lithium secondary cell. The invention also relates to a lithium secondary cell using this isolation film.
Description
【Technical field】 [0001] The invention relates to a lithium secondary battery, in particular to a lithium secondary battery separator and a lithium secondary battery using the separator. 【Background technique】 [0002] Lithium secondary batteries have been widely used in consumer electronic products such as mobile phones and notebook computers due to their excellent characteristics such as high energy density, high electromotive force and low self-discharge. [0003] The lithium secondary battery includes lithium metal secondary battery, lithium ion battery and polymer lithium battery. Lithium metal secondary batteries use metal lithium or lithium alloys or lithium-containing compounds as negative electrode materials, and transition metal compounds (such as V 6 o 13 ,MoS 2 , V 2 o 5 ,TiO 2 , MnO 2 ) as the positive electrode active material, anhydrous organic solvent as the electrolyte, and the general term for a type of battery in which the battery reaction can be re...
Claims
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IPC IPC(8): H01M2/16H01M10/40H01M50/446H01M50/489
CPCY02E60/122Y02E60/10
Inventor 黄文正黄全德
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD