A novel co-doped LiFePO4/C cathode material, modified for enhanced high power density battery applications

作者：Kiani G R^*; Boroomand S; Khodabakhshi R; Esmaeili M

来源：Microelectronic Engineering, 2015, 136: 77-80.

DOI：10.1016/j.mee.2015.04.029

• Co-doping
• Discharge capacity
• LiFePO4
• Li-ion/polymer battery
• High power density battery

Crystalline LiFePO4/C and co-doped LiFe1-x-yNixCoyPO4/C (x = 0.00-0.04; y = 0.00-0.04) nano-composite phases were synthesized by a simple high-temperature solid-state method. Structural characterization of samples conducted through X-ray diffraction, indicates highly crystallized olivine-related structure. Moreover, it implies that the Ni and Co co-doping on one side does not weaken the olivine structure of LiFePO4 and on the other side can further stabilize the crystal structure. Scanning Electron Microscopy (SEM) applied as morphological evaluation tool and depicted uniform grain distribution, smooth particles surface, and particles within nanometre range dimensions. Electrochemical performance characterization of the samples conducted by charge/discharge tests, illustrated that the Ni and Co co-doping improves cycling and high-rate capability of the LiFePO4/C. Especially, the LiFe0.98Ni0.01Co0.01PO4/C showed the best cycle stability and rate capability among all of the samples, reaching 93% of theoretical discharge capacity (similar to 170 mAh/g). Thereby, excellent cycle performance and capacity retention through wide discharge rates (C/10-10C) would make this cathode material a promising candidate for large-scale Li-ion/Polymer battery applications; such as PHEV, EV, grid storage and other energy storage systems.

• 出版日期2015-3-25