Localization of lithium battery separator -Lithium - Ion Battery Equipment

A breakthrough in the localization of lithium battery separators -Lithium - Ion Battery Equipment



A breakthrough has been made in the localization of lithium-ion battery separators

Core Tip: In short, the diaphragm is a porous plastic film. According to Yang, lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, membranes and shells. Separators serve to prevent short circuits between positive and negative electrodes in lithium-ion batteries, and to supply lithium-ion transport channels during charging and discharging of lithium-ion batteries. The performance of the separator determines the capacity, internal resistance, cycle, storage, safety and other properties of the lithium-ion battery. The separator is the most technical component of a lithium-ion battery, so it accounts for about one-third of a battery's cost. He said that with the country's strong support for the development of electric vehicles, my country's demand for power lithium-ion battery materials will explode in the next few years. By 2012, the demand for lithium-ion battery films for electric vehicles will increase tenfold to about 400 million square meters.(Lithium - Ion Battery Equipment)

At present, my country's lithium-ion battery separator market is seriously in short supply, and most of the market is occupied by products from the United States and Japan, resulting in high prices. After more than ten years of research and development, our diaphragm production has been industrialized, breaking the dominance of foreign diaphragms in the Chinese market. At the 2010 (5th) International Forum on Power Li-ion Battery Technology and Industrial Development held last week, Yang Shuting, director of Henan Xinxiang Green New Energy Materials Co., Ltd., said.

According to Yang Shuting, the company has formed a diaphragm production capacity of 60 million square meters, but the product is still in short supply, so the company decided to add a production line with an annual output of 100 million square meters, and the project is under construction.

The reason for the high technical content of the diaphragm is that the diaphragm is not easy to punch. At present, the most important membrane types in the world are single-layer polypropylene (PP) nano-microporous membrane, single-layer polyethylene (PE) nano-microporous membrane, PP/PE/PP three-layer composite nano-microporous membrane, etc. The technical breakthrough of grein is the single-layer PP microporous membrane. The company adopts the dry biaxial stretching process, that is, adding an organic crystal nucleating agent to the polypropylene, using the density difference between the different phases of the polypropylene, during the horizontal and vertical stretching process, the crystal form is transformed into micropores. The thickness of the diaphragm can reach 15 to 60 microns, which is especially suitable for power lithium-ion batteries.

Simply put, a diaphragm is a thin layer of porous plastic. According to Yang, lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, membranes and shells. Separators serve to prevent short circuits between positive and negative electrodes in lithium-ion batteries, and to supply lithium-ion transport channels during charging and discharging of lithium-ion batteries. The performance of the separator determines the capacity, internal resistance, cycle, storage, safety and other properties of the lithium-ion battery. The separator is the most technical component of a lithium-ion battery, so it accounts for about one-third of a battery's cost. He said that with the country's strong support for the development of electric vehicles, my country's demand for power lithium-ion battery materials will explode in the next few years. By 2012, the demand for lithium-ion battery films for electric vehicles will increase tenfold to about 400 million square meters per year. However, due to the high technical content of the diaphragm, it has not been realized in China.

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