Enhanced Reaction Kinetics and Structure Integrity of Ni/SnO2 Nanocluster toward High-Performance Lithium Storage

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• 作者：Yinzhu Jiang ; Yong Li ; Peng Zhou ; Shenglan Yu ; Wenping Sun ; Shixue Dou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：7
• 期：48
• 页码：26367-26373
• 全文大小：571K
• ISSN：1944-8252

文摘

SnO₂ is regarded as one of the most promising anodes via conversion-alloying mechanism for advanced lithium ion batteries. However, the sluggish conversion reaction severely degrades the reversible capacity, Coulombic efficiency and rate capability. In this paper, through constructing porous Ni/SnO₂ composite electrode composed of homogeneously distributed SnO₂ and Ni nanoparticles, the reaction kinetics of SnO₂ is greatly enhanced, leading to full conversion reaction, superior cycling stability and improved rate capability. The uniformly distributed Ni nanoparticles provide a fast charge transport pathway for electrochemical reactions, and restrict the direct contact and aggregation of SnO₂ nanoparticles during cycling. In the meantime, the void space among the nanoclusters increases the contact area between the electrolyte and active materials, and accommodates the huge volume change during cycling as well. The Ni/SnO₂ composite electrode possesses a high reversible capacity of 820.5 mAh g^鈥? at 1 A g^鈥? up to 100 cycles. More impressively, large capacity of 841.9, 806.6, and 770.7 mAh g^鈥? can still be maintained at high current densities of 2, 5, and 10 A g^鈥? respectively. The results demonstrate that Ni/SnO₂ is a high-performance anode for advanced lithium-ion batteries with high specific capacity, excellent rate capability, and cycling stability.