CoSn5 Phase: Crystal Structure Resolving and Stable High Capacity as Anodes for Li Ion Batteries

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• 作者：Xiao-Liang Wang ; Haiyan Chen ; Jianming Bai ; Wei-Qiang Han
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：June 7, 2012
• 年：2012
• 卷：3
• 期：11
• 页码：1488-1492
• 全文大小：272K
• 年卷期：v.3,no.11(June 7, 2012)
• ISSN：1948-7185

文摘

Tin alloys form a class of interesting high-energy-density anode materials for Li ion batteries, but the improvement of their cycling stability is elusive. Here, we provide new insight on this fatal issue by synthesizing novel CoSn₅-phase nanospheres via a conversion chemistry route and directly comparing their cell behavior with that of recently found FeSn₅-phase nanospheres. The CoSn₅ phase is absent in previous Co鈥揝n phase diagrams. Co_0.83Sn₅ nanospheres show a much longer cycle life, which partially is related to milder evolution of their cycling profiles over time.

Keywords:

Li battery; new phase; negative electrode; intermetallics; tin