LiFePO4 cathode materials of Li ion batteries

Due to environmental consciousness which Kyoto Protocol has passed a resolution to reduce greenhouse gas emission, RoHS has limited hurtful materials to use and the oil shortage and increasing demand. That caused the alternative energy, BEV (battery electric vehicle) and HEV (hybrid electric vehicle) to fast develop. However, there is more and more important trend in the development which new batteries to replace the present energy storage batteries (lead-acid battery, nickel hydrogen battery) possessed long-cyclelife, steady, safe and high C-rate charges/discharges.
In all kinds of secondary battery, due to lithium ion battery owns high-energy density, high operation voltage and long-cyclelife that have potential application in energy storage battery and electric power supply. But the lithium ion battery need to solve the question about safety and costs down etc. Compared with the several materials under development for use as cathodes in lithium ion batteries, the LiFePO4 have been recognized as a promising candidate as material for cathode of Li-batteries due to the low cost, environmental benignity, cycling stability, high C-rate charge/discharge and high theoretical capacity of 170 mAhg-1.

Basic Specification for product:
item Specification for product
0.2C discharge capacity >145 mAh/g
1C discharge capacity >120 mAh/g
Cycle life Room Temp. : 1000 cycle > 90%
55oC:1000 cycle > 80%
specific surface area 20 ~ 25 m2/g
Particle size D90 < 17£gm; mean size:4~8£gm
SEM image of LiFePO4 powder and the particle size distribution:


Charge/discharge test by coin cell at 0.1C rate:
Cyclelife test by 18650 cell:

Different C-rate test by 18650 cell: