Innovation in Li-ion Battery
Innovation in Li-ion Battery
LiFePO4Power Battery: Faster charging and safer performance
It is clear that the smallcapacity Li-ion (polymer) Batterycontaining lithium cobalt oxide(LiCoO2) offers a genuinely viable option for electronics and digital applications. However, lithium cobalt oxide (LiCoO2) is very expensive and un-safe for large capacity Li-ion Battery. Recently lithium iron phosphate (LiFePO4) has been becoming "best-choice" materials in commercial Li-ion (polymer) Batteries for large capacity and high power applications, such as lap-top, power tools, e-wheel chair, e-bike, e-car and e-bus. A LiFePO4battery has hybrid characters: as safe as lead-acid battery and as powerful as lithium ion cells. The advantages of large format Li-ion (polymer) batteries containing lithium iron phosphate (LiFePO4) are listed as below:
Duringcharging process, a conventional Li-ion Battery containing lithiumcobalt oxide (LiCoO2) needs two steps to be fully charged: step 1 is using constant current (CC) to get 60% State of Charge (SOC); step 2 takes place when charge voltage reaches 4.2V, upper limit of charging voltage, turning from CC to constant voltage (CV) while the charging current is taping down. The step 1 (60%SOC) needs two hours and the step 2 (40%SOC) needs another two hours. LiFePO4battery can be charged by only one step of CC to reach 95%SOC or be charged by CC+CV to get 100%SOC. The total charging time will be two hours.
2. Largeovercharge tolerance and saferperformance
ALiCoO2battery has a very narrow overcharge tolerance, about 0.1V over 4.2V of charging voltage plateau and upper limit of charge voltage. Continuous charging over 4.3V would either damage the battery performance, such as cycle life, or result in firing and explosion. A LiFePO4battery has a much wider overcharge tolerance of about 0.7V from its charging voltage plateau 3.4V. Exothermic heat of chemical reaction with electrolyte measured by DSC after overcharge is only 90J/g for LiFePO4verse 1600J/g for LiCoO2. The more is the exothermic heat, the larger energy heating up the battery in its abusive condition, the more chance toward firing and explosion. A LiFePO4battery would be overcharged upto 30V without portection circuit board. It is suitable for large capacity and high power applications. From viewpoint of large overcharge tolerance and safety performance, a LiFePO4battery is similar to lead-acid battery.
3. Self balance
Alike lead-acid battery, anumber of LiFePO4cells in a battery pack in series connection would balance each other during charging process, due to large overcharge tolerance. This self balance character can allow 10% difference between cells for both voltage and capacity inconsistency.
4. Simplifying battery management system (BMS) andbattery charger
Largeovercharge tolerance and self-balance character ofLiFePO4battery would simplifybattery protection and balance circuit boards, lowering their cost.One step charging process would allow to use simpler conventionalpower supplier to charge LiFePO4battery instead to use aexpensive professional Li-ion batterycharger.
5. Longer cyclelife
Incomparison with LiCoO2battery which has acycle life of 400 cycles, LiFePO4battery extends itscycle life up to 2000 cycles.
6. High temperatureperformance
It isdetrimental to have a LiCoO2battery working atelevated temperature, such as 60C.. However, a LiFePO4battery runs better atelevated temperature, offering 10% more capacity, due to higherlithium ionic conductivity.