Effect of Nb5+ Doping on the Structure and Electrochemical Performances of LiFePO4

2nd International Conference on Frontiers of Materials Synthesis and Processing

Chen, Lin^1 ; Lu, Cheng^1 ; Yin, Shuo^2 ; Wang, Meng^1 ; Wang, Yiqiao^2 ; Liu, Hui^2 ; Ren, Yongzhi^2 ; Zuo, Lingli^1 ; Guo, Caiyu^1 ; Zhang, Yang^1 ; Chen, Yunbo^1

Beijing National Innovation Institute of Lightweight Co. Ltd., Beijing

100083, China^1

CNGR Advanced Material Co. Ltd., Guizhou

554300, China^2

关键词: Cath-ode materials;    Charge/discharge;    Discharge specific capacity;    Electrochemical performance;    High rate capability;    Low temperatures;    Olivine structures;    Specific capacities;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/493/1/012045/pdf
DOI  :  10.1088/1757-899X/493/1/012045

来源: IOP

【 摘 要 】

Nb-doped LixNb0.005FeyPO4/C cathode material for lithium-ion batteries were prepared by two-fluid spray-drying using FePO4•2H2O, LiOH•H2O, C6H12O6(glucose) as raw materials under N2 atmosphere. The effects of doping Nb5 on the structure, morphology and electrochemical performances of LiFePO4 were investigated. The results show that LixNb0.005FeyPO4/C has Olivine Structure and pure phase. The LixNb0.005FeyPO4/C had an initial discharge specific capacity of 158.5mAh/g at 0.1C and its specific capacities were 109mAh/g at 5C. The initial charge/discharge efficiency reached 93.9%. The discharge specific capacity of the LixNb0.005FeyPO4/C at 253K is 82.2mAh/g. This investigation suggests that the Nb5 doped material possess high rate capability and excellent low temperature electrochemical performance.