Lithium iron phosphate electrode materials are mainly used in various lithium ion batteries. Since the NTT in Japan first revealed the olivine-structured lithium battery cathode material of AyMPO4 (A is an alkali metal, M is a combination of CoFe: LiFeCOPO4), In 1997, John. B. Goodenough and other research groups at Texas State University reported the reversible relocation of LiFePO4 into lithium. The United States and Japan unanimously published the olivine structure (LiMPO4), making the material It has received great attention and has led to extensive research and rapid development. Compared with the traditional lithium ion secondary battery cathode material, the spinel structure of LiMn2O4 and the layered structure of LiCoO2, LiMPO4 has a wider source of raw materials, lower cost and no environmental pollution.
The application fields of lithium iron phosphate mainly include:
(1) Energy storage equipment solar energy, energy storage equipment for wind power generation systems, UPS for uninterruptible power systems, and solar energy batteries for use as energy storage equipment (BYD is already producing such batteries);
(2) Power tools such as high-power electric tools (wireless), electric drills, weeders, etc.;
(3) Light electric vehicle electric motor vehicles, electric bicycles, recreational vehicles, golf carts, electric pushers, cleaning vehicles, hybrid electric vehicles (HEV), the target of 2-3 years;
(4) Small equipment medical equipment: electric wheelchairs, electric scooters), toys (remote control electric aircraft, cars, boats);
(5) Other small electrical miner's lamp, implantable medical device (lithium iron phosphate is non-toxic, lithium battery can only meet the requirements of iron and lithium), replace lead acid, nickel hydrogen, nickel cadmium, lithium cobalt, lithium manganese battery in small Electrical applications
1. High energy density,
Its theoretical specific capacity is 170mAh / g, the actual specific capacity of the product can exceed 140 mAh / g (0.2C, 25 ° C);
2. Security,
It is the current *safe lithium ion battery cathode material; does not contain any heavy metal elements harmful to human body;
3. Long life.
Under the condition of 100% DOD, it can be charged and discharged more than 2000 times; (Cause: the stability of lithium iron phosphate lattice is good, the insertion and extraction of lithium ions have little effect on the crystal lattice, so it has good reversibility. It is a poor ion conductivity of the electrode, which is not suitable for charging and discharging of a large current, and is hindered in application. Solution: coating the surface of the electrode with a conductive material and doping for electrode modification.
4. No memory effect;
5. Charging performance,
The lithium battery of lithium iron phosphate cathode material can be charged at a large rate, and the battery can be fully charged within 1 hour.
Specific physical parameters: Bulk density: 0.7g/cm Tap density: 1.2g/cm Median diameter: 2-6um Specific surface area <30m/g
Smear parameters: LiFePo4: C: PVDF = 90:3:7 Pole piece compaction density: 2.1-2.4g/cm
Electrochemical performance: gram capacity > 155mAh / g Test conditions: half-cell, 0.2C, voltage 4.0-2.0V Cycle times: 2000 times domestic and international lithium iron phosphate material manufacturers:
Domestic: Hangzhou Jinma Energy Yunnan Huilong Tianjin Strand North University Hunan Ruixiang Iron Tiger Energy Taiwan Long Taiwan Taiwan Li Kai Zhengzhou Langtai Hangzhou Sainz Jiangxi Jin Li Technology and other international: Canada Phostech, USA Valence, USA A123, Japan sony Among them, the A123 scale has received strong support from the US government.
The specific surface area of ​​lithium iron phosphate is tested by the 3H-2000 series specific surface area meter produced by Bethesda Instruments Technology (Beijing) Co., Ltd., which has been widely used in upstream and downstream enterprises in the battery industry. Such as Black Dragon Graphite, TEDA Graphite, Tianjin Bammer Technology, Shenzhen Dickert, Jiujiang Decatur, Hunan Shanshan, AVIC Lithium, etc. are numerous. I look forward to working with you.
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