Acetylene Black Induced Heterogeneous Growth of Macroporous CoV2O6 Nanosheet for High-Rate Pseudocapacitive Lithium-Ion Battery Anode

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• 作者：Lei Zhang ; Kangning Zhao ; Yanzhu Luo ; Yifan Dong ; Wangwang Xu ; Mengyu Yan ; Wenhao Ren ; Liang Zhou ; Longbing Qu ; Liqiang Mai
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：March 23, 2016
• 年：2016
• 卷：8
• 期：11
• 页码：7139-7146
• 全文大小：489K
• ISSN：1944-8252

文摘

Metal vanadates suffer from fast capacity fading in lithium-ion batteries especially at a high rate. Pseudocapacitance, which is associated with surface or near-surface redox reactions, can provide fast charge/discharge capacity free from diffusion-controlled intercalation processes and is able to address the above issue. In this work, we report the synthesis of macroporous CoV₂O₆ nanosheets through a facile one-pot method via acetylene black induced heterogeneous growth. When applied as lithium-ion battery anode, the macroporous CoV₂O₆ nanosheets show typical features of pseudocapacitive behavior: (1) currents that are mostly linearly dependent on sweep rate and (2) redox peaks whose potentials do not shift significantly with sweep rate. The macroporous CoV₂O₆ nanosheets display a high reversible capacity of 702 mAh g^–1 at 200 mA g^–1, excellent cyclability with a capacity retention of 89% (against the second cycle) after 500 cycles at 500 mA g^–1, and high rate capability of 453 mAh g^–1 at 5000 mA g^–1. We believe that the introduction of pseudocapacitive properties in lithium battery is a promising direction for developing electrode materials with high-rate capability.