title: Carbon and RuO2 binary surface coating for the Li3V2(PO4)3 cathode material for lithium-ion batteries.
abstract: RuO2 nanocrystals are successfully impregnated into the surface carbon layer of the Li3V2(PO4)3/C cathode material by the precipitation method. Transmission electron microscopy shows that the RuO2 particles uniformly embed in the surface carbon layer. Cyclic voltammetry and electrochemical impedance spectroscopy indicate that the coexistence of carbon and RuO2 enables high conductivity for both Li ions and electrons and thus stabilizes the interfacial properties of the electrode, facilitates the charge transfer reactions, and improves the Li(+) diffusion in the electrode. As a result, the Li3V2(PO4)3 cathode coated with the binary surface layer shows improved rate capability and cycle stability. Particularly, the material containing 2.4 wt % Ru exhibits the best electrochemical performance and delivers a discharge capacity of 106 mAh g(-1) at the 10 C rate with a capacity retention of 98.4% after 100 cycles.
authors.affiliation: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, People's Republic of China.
authors.forename: Rongyu
authors.initials: R
authors.lastname: Zhang
authors.forename: Yongquan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Kai
authors.initials: K
authors.lastname: Zhu
authors.forename: Fei
authors.initials: F
authors.lastname: Du
authors.forename: Qiang
authors.initials: Q
authors.lastname: Fu
authors.forename: Xu
authors.initials: X
authors.lastname: Yang
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Wang
authors.forename: Xiaofei
authors.initials: X
authors.lastname: Bie
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Yingjin
authors.initials: Y
authors.lastname: Wei