Positive and negative electrode composition of lithium battery

Lithium batteries usually have two appearances: cylindrical and square. The inside of the battery adopts a spiral wound structure, and a very fine and highly permeable polyethylene film separator is used to separate the positive and negative electrodes. The positive electrode includes a current collector composed of lithium cobalt oxide (or lithium nickel cobalt manganate, lithium manganate, lithium iron phosphate, etc.) and aluminum foil. The negative electrode is composed of a current collector composed of graphitized carbon material and copper foil. The battery is filled with an organic electrolyte solution. In addition, it is equipped with safety valve and PTC element (partial cylindrical use) to protect the battery from damage when the battery is abnormal and the output is short-circuited. The voltage of a single-cell lithium battery is 3.7V (the lithium iron phosphate positive electrode is 3.2 V) The battery capacity cannot be infinite. Therefore, single-cell lithium batteries are often processed in series and parallel to meet the requirements of different occasions.