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What is lithium film technology? What are the performance requirements for the product?

(1) Product classification

The separator, positive electrode material, negative electrode material, and electrolyte are the most important components of lithium-ion batteries. The internal structure of lithium-ion batteries is spiral shaped, which requires a very fine and permeable thin film isolation material between the positive and negative electrodes.

At present, the large-scale commercial production of polyolefin based materials for lithium-ion battery membranes includes polypropylene (PP), polyethylene (PE), polypropylene (PP), and polyethylene (PE) composite materials. Polyolefins have excellent mechanical properties, chemical stability, and high-temperature self closing function. It was an important raw material for lithium-ion battery separators at that time. According to different characteristics, separators can be divided into the following categories:

(2) Product Features

The membrane of lithium-ion batteries has a large number of serrated micropores, which can ensure that electrolyte ions pass through the charge and discharge circuit. When the battery is overcharged or the temperature rises, the membrane isolates the positive and negative electrodes of the battery through a closure, preventing them from directly contacting and short circuiting, achieving the purpose of blocking current conduction, preventing the battery from overheating or even bursting. The specific functional recommendations for the diaphragm are as follows:

(3) Product Features

Due to the important characteristics of lithium-ion battery capacity, cycling function, charging and discharging current density, it is required that the separator have appropriate thickness, ion transfer rate, pore size and porosity, as well as satisfactory chemical stability, thermal stability and mechanical stability. The details are as follows:

(4) Product Technology

The demand for lithium-ion battery separators has many characteristics, which put forward special requirements for their production processes, including raw material formulation and rapid formulation adjustment, microporous preparation technology, and independent planning of complete equipment. Meanwhile, microporous preparation technology is the core of lithium-ion battery separator preparation technology, which can be divided into dry uniaxial stretching, dry biaxial stretching, and wet stretching.

The dry uniaxial stretching technology abroad is mainly developed and mastered by Celgard Corporation in the United States. Ube in Japan purchased a portion of this technology from Celgard in the United States. In 2008, Xingyuan Materials independently developed domestic dry uniaxial stretching technology and obtained corresponding patent technology; Dry biaxial stretching technology was developed by the Institute of Chemistry, Chinese Academy of Sciences. The wet process was first proposed by Asahi.

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