Uniform LiNi_1/3Co_1/3Mn_1/3O₂ hollow microspheres: Designed synthesis, topotactical structural transformation and their enhanced electrochemical performance

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• 作者：Jingfa Li ; Shenglin Xiong ; Yurong Liu ; Zhicheng Ju ; Yitai Qian
• 关键词：Hollow microspheres ; Cathode ; Lithium ion battery
• 刊名：Nano Energy
• 出版年：November, 2013
• 年：2013
• 卷：2
• 期：6
• 页码：1249-1260
• 全文大小：4143 K

文摘

In this work, we designed a facile in-situ template-sacrificial route to prepare LiNi_1/3Co_1/3Mn_1/3O₂ hollow microspheres with an average diameter of 2.0 渭m for the first time through using porous spinel Mn_1.5Co_1.5O₄ hollow microspheres as the template, the formation of which could originate from a synergic effect of the contraction and adhesion action generated during the oxidative decomposition of the Mn_0.5Co_0.5CO₃ precursors. The walls of the as-prepared hollow microspheres are ~300 nm in thickness, and composed of numerous primary particles with size of hundreds of nanometers. The as-synthesized nanocrystal-assembled hollow structure showed singnificantly enhanced electrochemical performance with high capacity, excellent cycling stability and good rate capability, compared with the bulk counterparts, when used as a cathode material for Li ion batteries (LIBs), which can be attributed to the unique nano/micro hierarchical structure. Specifically, the resulting LiNi_1/3Co_1/3Mn_1/3O₂ hollow microspheres achieve a high discharge capacity of 157.3 mAh g^鈭? at 0.2 C after 100 cycles and 120.5 mAh g^鈭? at 0.5 C after 200 cycles with an excellent cycle life. Interestingly, it exhibits a high rate capacity of 114.2 mAh g^鈭? even at a current of 1 A g^鈭? (5 C). On the basis of this work, the pesent preparation strategy could provide an effective and general approach to improve the cyclability and rate capability of high-capacity cathode materials with hollow interiors for the application of LIBs.