Synthesis and performance of Li_1.5V₃O₈ nanosheets as a cathode material for high-rate lithium-ion batteries

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• 作者：Yanli Wang ; Xingyan Xu ; Chuanbao Cao ; Cui Shi ; Wei Mo ; Hesun Zhu
• 关键词：Lithium-ion batteries ; Lithium vanadate ; Sol&ndash ; gel method ; Nanosheets
• 刊名：Journal of Power Sources
• 出版年：2013
• 出版时间：15 November, 2013
• 年：2013
• 卷：242
• 期：Complete
• 页码：230-235
• 全文大小：1114 K

文摘

Li_1.5V₃O₈ nanosheets as a cathode material for high-rate lithium-ion batteries are prepared by sol-gel method. SEM and TEM observations show that the prepared samples are nanosheet structure, with a typical width of 600?nm and length of 800?nm. Charge-discharge measurements demonstrate that Li_1.5V₃O₈ nanosheets exhibit high initial discharge specific capacity of 260, 204?mAh?g^?1 at current densities of 130?mA?g^?1 and 175?mA?g^?1, respectively. Even after 100 cycles, the discharge specific capacity still remains 170?mAh?g^?1 and 100?mAh?g^?1. The high discharge specific capacity and good cycling stability are attributed to nanosheets morphology of Li_1.5V₃O₈ that can provide lithium ions with more sites, shorten diffusion distance, and maintain good contact between the active material and electrolyte. All these results indicate that Li_1.5V₃O₈ nanosheets are promising cathode materials for lithium-ion batteries.