The new generation power solution forElectricVehicle
Advancing technology to changetheworld
lithium iron phosphate as cathode(LIFEPO4technology)
Due to the shortage of fossil fuels and environmental concerns,were convinced that the green energy industry and relatedindustrieswill become the main stream in the coming 30-50 years.This causesa strong demand of rechargeable batteries. However, theexistinglithium ion cell systems including lithium cobalt oxide andlithiummanganese oxide still suffer from low discharge rate,safetyconcern and short cycle life.
To solve those issues, Dr. John Goodenough and his teamatUniversity of Texas patented as potential cathode materialLiFePO4as a potential cathode in 1996. It is a very stable materialdue tothe covalent P-O bonding which stabilize the fully chargedcathodeversus O2 release. scientists have developed the LiFePO4batteryusing lithium iron phosphate as cathode to answer concernsin thebattery for Electric Vehicles and other battery useages..
Under its pure form, the Olivine-structured materialshowedspecific capacities up to 170 mAh/g.
Currently, many electric vehicles use the the lead acid batteryforthe 36V/10Ah mold, with 360 Wh total energy, 26.4 lbs. (12kg)weight, and can be used to drive 30 miles (50km), under100%optimal circumstances. Its cycle life is only about 100 -300times, each 12v battery price is about 35 - 40 USD, theservicelife is about 12 months. A big problem is the pollutionproduced bylead acid battery. If LiFePO4 material is adopted asanode to make10Ah battery, it requires 12 battery pieces as seriesin a wholepack. The whole mold is only about 7 lbs. (3-4 kg)weight, if itcan be made 11 lbs (5 kg) weight, the ebike can travelover 48miles (80 km) far in laboratory experiments.
Comparing LiFePO4 battery with otherEVBatteries
There are three types of lithium ion cells based ondifferentcathode materials. They are lithium cobalt oxide, lithiummanganeseoxide and lithium iron phosphate types. Although lithiumcobaltoxide cell has the advantage of high energy density, itsuffersfrom safety concerns. Lithium manganese oxide cell hasbeenevaluated for the application on high rate due to the bettersafetycharacteristics. However, its high temperature performance isthemajor drawback.
While Lithium iron phosphate cell has the bestsafetycharacteristics, long cycle life (up to 2000 cycles) andgoodavailability. It is very suitable for high discharge rateoccasionssuch as EV (including e-bike, electric scooter, andelectric car),power tools, UPS and solar energy system. Accordingto differentapplications, Libertycan modify the design of battery pack to providethebest solution to satisfy our customer' s needs.
COMPARISON DATA AMONG VARIOUS LITHIUM BASEBATTERIES:
Long Term Cost
Most Economic/ Excellent
(-20C to 70C)
(-20C to 55C)
Decay extremely fast over 50 C
-20C to 55C
1. Although, Lead Acid battery is lower in cost andsafetyacceptable; however, with extremely toxic, worse fortheenvironmental concern, short cycle life, heavy inweight,therefore, we don't put it as a group forcomparison.
2. Nickel Hydride battery has a characteristic oflowPower Weight Density, decayed faster under the hightemperature,worse in memory effect, not suitable for highoutputusage.
3. The C-coated Lithium Iron Phosphate Batteryhasbeen proven as the most environmental friendly battery. It isthesafest and most suitable for high output usage. It is also thebestfor storage battery usage. It is not necessary to use theequalizerand the protecting PC Board module.
The LiFePO4 battery Does not have the securityhiddendanger
When phosphate batteries are overcharged under 3A 5V, temperatureofthe battery could not surpass 55°C, the battery is extremelysafe;Heats up after 7-8 hour to 300°C in hot box process,batterytemperature nearly the same with temperature of hot box,thebattery cannot appear hotly out of control; after extrusionoracupuncture, the battery temperature cannot surpass 110°C.
The safety of lithium battery is guaranteed by using LiFePO4asanode pole. LiFePO4 is one kind of phosphate gathering theanion,the P-O chemical bond is extremely strong, materialisthermodynamically stable, do not worry about it can releasetheoxygen, simultaneously LiFePO4's olivine crystal structuredecidesits crystal lattice deformation smaller in the sufficientelectricdischarge process, its material structure is stable andsafe, andalso its cycle life are extremely long. Thesecharacteristics alsocan make LiFePO4 withstand oxidation and acidicenvironment, thebattery has more electrolyte choice, the batteryperformance can beoptimized.
The safety characteristics inherent toLiFePo4technology result from the incorporation of phosphates asthecathode material. Phosphates are extremely stable in overchargeorshort circuit conditions and have the ability to withstandhightemperatures without decomposing. When abuse does occur,phosphatesare not prone to thermal runaway and will not burn. As aresult,LiFePo4 technology possesses safety characteristics thatarefundamentally superior to those of Lithium-ion batteries madewithother cathode materials.
LiFePo4 technology does not contain any heavy metals and doesnotexhibit the "memory effect" of Nickel-Cadmium andNickel-metalHydride solutions. LiFePo4 technology demonstratesexcellent shelflife, long cycle life and is maintenance free.
Another key benefit of our LiFePo4 technology is itsflexibility,both in terms of battery application and cell design.It can beused in wound cylindrical, wound prismatic and polymerbatteryconstruction types and manufactured to fitsmallerapplications.
The advantages of traditional Lithium-ion coupled with thesafetyfeatures of phosphates, make LiFePo4 technology theLithium-iontechnology for the future. Our LiFePo4 Lithium-iontechnologyutilizes natural, phosphate-based material and offers thegreatestcombination of performance, safety, cost, reliabilityandenvironmental characteristics.
OSN LiFePO4 Batteries
We all use and take for granted the benefits of lithium-ionenergystorage systems in our cell phones, notebooks, PDA's,consumerappliances and other devices. However, recent recalls bythe USConsumer Protection Commission have brought to light thepotentialhazards of lithium-ion batteries. Just imagine what couldhappen toa large lithium-ion battery if an electric/hybrid electricvehiclewere rear-ended or if a manufacturing defect or other abusecauseda thermal event in a mission critical telecom backup system.Theresults could be devastating.
Liberty is intent on working on developing and making available to allEVapplications the LiFePo4 technology---the only safe largeformatlithium-ion rechargeable battery technology. We sincerelyhope tohave chance to cooperate with our customers all over theworld andcontribute the latest world-wide technology to ourcustomersprosperous business future.
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