The major business of W-SCOPE Group is the manufacture and sale of separators for lithium-ion secondary cell batteries skillfully using one-of-a-kind polymer film technology. Polymer film is used to make our daily lives more convenient and pleasant in a wide range of end products such as telecommunications, consumer tools, transport, industrial tools, medical care, etc.
The chief materials of lithium-ion secondary cell batteries are positive electrode materials, negative electrode materials, electrolytes, and separators, and there are 20 to 30 related materials other than the chief materials such as copper foil, binders, and additive agents. But the performance and cost of materials of lithium-ion secondary cell batteries are mainly determined by such chief materials.
In separators for lithium-ion secondary cell batteries, microporous membranes made of polyolefin are generally used, and they serve the role of maintaining the conductivity between the negative/positive of the polyolefin while isolating the positive electrode materials and negative electrode materials. Also, when the battery overheats and becomes abnormally hot, the polyolefin melts down and blocks the pores as a safety feature (shutdown characteristic), which allows the prevention of the lithium-ion from moving and serves the important role of safely stopping the function of the battery, impacting the safety of the battery.
Lithium-ion secondary cell batteries currently enjoy wide use mainly in portable electronics such as mobile PCs, etc. Also, the markets are expanding for use in such environmentally responsive cars as hybrid cars and electric cars as well as storage use for electric storage and fixed storage, etc.