The higher the price of lithium batteries for electric bicycles, the stronger the performance should be, and performance generally refers to the performance of carbon foil on capacitance, which is roughly divided into six categories1, inhibit battery polarization, reduce the heat effect, improve multiplier performance;2, reduce the internal resistance of the battery, and significantly reduce the dynamic internal resistance increase of the cycle process;3, improve consistency, increase the battery cycle life;4, improve the adhesion of active substances to the collection of fluids, reduce the cost of electrode manufacturing;5, protection set fluid is not corroded by electrolyte;6, improve the high and low temperature performance of lithium iron phosphate batteries, improve the processing performance of lithium iron phosphate, lithium titanate materials.