Lithium iron phosphate battery refers to a lithium ion battery using lithium iron phosphate as the positive electrode material. The cathode materials of lithium ion batteries mainly include lithium cobalt oxide, lithium manganate, lithium nickel oxide, ternary materials, lithium iron phosphate, etc. Among them, lithium cobalt oxide is the cathode material currently used in most lithium-ion batteries.
The P-O bond in lithium iron phosphate crystal is stable and not easy to decompose, even at high temperatures or overload, it will not collapse and generate heat nor will it form strong oxidizing substances like lithium cobalt oxide. good security. According to some reports, in actual operations, a small number of samples burned during acupuncture or short circuit experiments, but no explosions occurred.is produced in overcharge experiments, a high voltage charge several times higher than the discharge voltage was used. , and it was found that there were still explosion phenomena. Despite this, its overcharge safety has been significantly improved compared to ordinary liquid electrolyte, lithium and cobalt oxide batteries. The lifespan of long life lead acid batteries is about 300 times and the maximum is 500 times, while the lifespan of lithium iron phosphate batteries reaches more than 2000 times and can reach 2000 times with one standard charge (5 hours). rate). Lead-acid batteries of the same quality last six months for new ones, six months for old ones and another six months for maintenance, or 1 to 1.5 years at most. However, when used under the same conditions, the theoretical duration. the lifespan of lithium iron phosphate batteries will reach 7-8 years. In considerationoverall, the performance-price ratio is theoretically more than 4 times higher than that of lead-acid batteries. High current discharge can quickly charge and discharge at a high current of 2C. Under a special charger, the battery can be fully charged in 40 minutes at 1.5C, and the starting current can reach 2C. performance.
(Photo/Text/Photo: Li Yan1) @2019