Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 3, Issue 11, Pages 1488-1492Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz300461h
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- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Brookhaven National Laboratory
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-98CH10886]
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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-Sn phase diagrams. Co0.83Sn5 nanospheres show a much longer cycle life, which partially is related to milder evolution of their cycling profiles over time.
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