Lithium ion battery is a kind of secondary battery (rechargeable battery), it mainly relies on lithium ions moving between the positive pole and the negative pole to work, in the charging and discharging process, Li+ between the two electrodes back and forth embedded and deembedded: charging, Li+ from the positive electrode deembedded, through the electrolyte embedded into the negative pole, the negative pole is in a lithium rich state; The opposite is true when discharging.
Steel shell/aluminum shell/cylinder/flexible packaging series:
- (1) the positive active material is commonly or cobalt acid lithium manganese acid lithium nickel manganese cobalt acid lithium materials, electric bicycle is common to use lithium cobalt nickel manganese acid (commonly known as the three yuan) or three yuan plus a small amount of manganese acid lithium, pure manganese acid lithium and lithium iron phosphate is due to the large size, high performance is bad or cost gradually fade out, conductive set fluid using 10-20 microns thickness electrolysis aluminum foil.
(2) diaphragm - a specially shaped polymer film, the film has a microporous structure, can let lithium ions through freely, and electrons can not pass through.
(3) Anode -- the active substance is graphite, or carbon with a similar graphite structure, and the conductive collector uses electrolytic copper foil with a thickness of 7-15 microns.
(4) Organic electrolyte -- carbonate solvent with lithium hexafluorophosphate dissolved, polymer gel electrolyte is used.
(5) battery shell - divided into steel shell (square type rarely used), aluminum shell, nickel-plated iron shell (cylindrical battery use), aluminum plastic film (soft packaging), and the battery cap, is also the positive and negative end of the battery.
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