Rapid Lithiation and Delithiation Property of V-Doped Li2ZnTi3O8 as Anode Material for Lithium-Ion Battery

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• 作者：Ting-Feng Yi ; Jin-Zhu Wu ; Jing Yuan ; Yan-Rong Zhu ; Peng-Fei Wang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：December 7, 2015
• 年：2015
• 卷：3
• 期：12
• 页码：3062-3069
• 全文大小：600K
• ISSN：2168-0485

文摘

Li_2鈥?i>xV_xZnTi₃O₈ (x = 0, 0.05, 0.1 and 0.15) anode (negative electrode) materials were successfully synthesized by a facile solid-state reaction method, and the structure, morphology, and electrochemical properties of the Li_2鈥?i>xV_xZnTi₃O₈ materials were investigated. Li_2鈥?i>xV_xZnTi₃O₈ (x = 0 and 0.05) samples show the pure phase structure with P4₃32 space group, but several rutile TiO₂ peaks are founded in Li_2鈥?i>xV_xZnTi₃O₈ (x 鈮?0.1). V-doping does not change the electrochemical reaction mechanism and destroy the structure of Li₂ZnTi₃O₈. All samples show a size distribution under 1 渭m, but the V-doped powders show a narrower particle size distribution and less agglomeration than those of pristine Li₂ZnTi₃O₈. Electrochemical kinetics results reveal that the V-doped Li₂ZnTi₃O₈ samples display higher reversibility, larger lithium diffusion coefficients and lower charge-transfer resistances than those of pristine Li₂ZnTi₃O₈. Galvanostatic electrochemical tests show that the Li_1.95V_0.05ZnTi₃O₈/Li half cell delivers the highest lithiation capacities at various rates (213.3, 171.2, 132.5, and 84.7 mA h g^鈥? at 0.2, 1, 2, and 5 C rates, respectively), whereas the Li₂ZnTi₃O₈/Li half cell delivers much less lithiation capacities at all rates (184.5, 129.5, 107.3, and 24 mA h g^鈥? at 0.2, 1, 2, and 5 C rates, respectively). The simple preparation process, low preparation cost, excellent cycling stability, and wide voltage range give the Li_1.95V_0.05ZnTi₃O₈ potential for commercial application in the future.