Construction of a cathode using amorphous FePO4 nanoparticles for a high-power/energy-density lithium-ion battery with long-term stability

Using amorphous FePO 4 ( a -FePO 4 ) nanoparticles with a high purity, a narrow size distribution and good dispersion , we successfully developed a new strategy to generate a uniformly dispersed a -FePO 4 -CNT nano-composite using the interface interaction between surface-modified a -FePO 4 and CNT dispersion under mild sonication . The uniformly dispersed a -FePO 4 -CNT nano-composite exhibited the best performance and long-term stability as a cathode material in a lithium-ion battery compared to previously reported results. The developed nano-composite could deliver a theoretical specific capacity at 0.1 C, 162 mAh g −1 at 1 C and 117 mAh g −1 at 5 C. No capacity fading was observed at 1 C after 500 cycles, and nearly 90% of the initial discharge capacity could be retained at 5 C after 2000 cycles. This study confirms the validity of the proposed strategy to construct a cathode structure, and also describes the potential of a -FePO 4 for building high-power energy-storage and conversion systems.