Comparative investigation of phosphate-based composite cathode materials for lithium-ion batteries

Jun-chao Zheng; Ya-dong Han; Bao Zhang; Chao Shen; Lei Ming; Jia-feng Zhang

doi:10.1021/am502601r

Comparative investigation of phosphate-based composite cathode materials for lithium-ion batteries

ACS Appl Mater Interfaces. 2014 Aug 27;6(16):13520-6. doi: 10.1021/am502601r. Epub 2014 Aug 14.

Authors

Jun-chao Zheng¹, Ya-dong Han, Bao Zhang, Chao Shen, Lei Ming, Jia-feng Zhang

Affiliation

¹ School of Metallurgy and Environment, Central South University , Changsha 410083, P.R. China.

PMID: 25090161
DOI: 10.1021/am502601r

Abstract

Li3V2(PO4)3-LiVPO4F, LiFePO4-Li3V2(PO4)3, and LiFePO4-Li3V2(PO4)3-LiVPO4F composite cathode materials are synthesized through mechanically activated chemical reduction followed by annealing. X-ray diffraction (XRD) results reveal that the obtained products are pure phase, and the molar ratio of each phase in the composites is consistent with that in raw material. Transmission electron microscopy (TEM) images show that each phase coexists in the composites. The LiFePO4-Li3V2(PO4)3-LiVPO4F composites exhibit the best electrochemical performance. These composites can deliver a capacity of 164 mAh g(-1) at 0.1 C and possess favorable capacities at rates of 0.5, 1, and 5 C. The excellent electrochemical performance is attributed to the mutual modification and the synergistic effects.

Publication types

Research Support, Non-U.S. Gov't