In Situ Synthesis of CuxO/SnOx@CNT and CuxO/SnOx@SnO2/CNT Nanocomposite Anodes for Lithium Ion Batteries by a Simple

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• 作者：Xiang Liu ; Fangzhou Liu ; Qian Sun ; Alan Man Ching Ng ; Aleksandra B. Djuri拧i膰 ; Maohai Xie ; Changzhong Liao ; Kaimin Shih ; Zhaofeng Deng
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：August 27, 2014
• 年：2014
• 卷：6
• 期：16
• 页码：13478-13486
• 全文大小：691K
• ISSN：1944-8252

文摘

SnO₂-based electrodes for lithium ion batteries (LIBs) typically exhibit high initial specific capacity but poor cycling performance. A possible strategy to improve the cycling performance is to prepare nanocomposites containing SnO₂. Here we demonstrate a straightforward method to prepare composites containing SnO_x and Cu_xO by a simple chemical treatment of the LIB electrode on copper foil. The in situ formation of a multiphase composite results in a dramatic improvement in the cycling performance, so that specific capacities exceeding 580 and 800 mA路h/g can be obtained after 70 charge/discharge cycles for Cu_xO/SnO_x@CNT and Cu_xO/SnO_x@SnO₂/CNT electrodes, respectively (compared to <100 mA路h/g for pure SnO₂). The capacity retention achieved at the 70th cycle compared to the 2nd cycle was 96% for the Cu_xO/SnO_x@CNT electrode. The mechanisms responsible for the formation of a composite material and the improvement in the performance are discussed.

Keywords:

metal oxide nanostructures; lithium ion batteries