Comparative study of Li2ZnTi3O8 anode material with good high rate capacities prepared by solid state, molten salt and sol

By Liu, Tao; Tang, Haoqing; Zan, Lingxing; Tang, Zhiyuan
Published in Journal of Electroanalytical Chemistry NULL 2016

Abstract

Abstract Cubic spinel Li2ZnTi3O8 is a promising lithium ion battery electrode anode material with high specific lithium-intercalation capacity and low discharge voltage platform. Herein, Li2ZnTi3O8 anode materials are synthesized through solid state reaction, molten salt route, and sol-gel method, respectively. Sol-gel formed Li2ZnTi3O8 exhibits good crystallinity from {XRD} and agglomeration is alleviated with uniform particle size and more stack holes from {SEM} images compared with other methods. Cyclic voltammograms (CV) results show that the sol-gel formed Li2ZnTi3O8 electrode has the lowest polarization, indicating better kinetic process. Electrochemical impedance spectroscopy (EIS) reveals that the sol-gel formed Li2ZnTi3O8 sample exhibits highest electronic conductivity and faster lithium ion diffusivity in all three samples. The sol-gel formed Li2ZnTi3O8 electrode has excellent long-term cycling performance and high discharge capacities of 71.2, 90.9, and 150.0 mAh g? 1 after 1000 charge-discharge cycles with low capacity fadings of only 0.058%, 0.051%, and 0.028% per cycle, at 3000, 2000, and 1000 mA g? 1, respectively. These results show that sol-gel formed Li2ZnTi3O8 is a promising anode electrode material for high performance lithium ion batteries.

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