期刊
NATURE NANOTECHNOLOGY
卷 11, 期 7, 页码 626-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2016.32
关键词
-
资金
- Office of Vehicle Technologies of the US Department of Energy under the Battery Materials Research (BMR) program
Metallic lithium is a promising anode candidate for future high-energy-density lithium batteries. It is a light-weight material, and has the highest theoretical capacity (3,860 mAh g(-1)) and the lowest electrochemical potential of all candidates. There are, however, at least three major hurdles before lithium metal anodes can become a viable technology: uneven and dendritic lithium deposition, unstable solid electrolyte interphase and almost infinite relative dimension change during cycling. Previous research has tackled the first two issues, but the last is still mostly unsolved. Here we report a composite lithium metal anode that exhibits low dimension variation (similar to 20%) during cycling and good mechanical flexibility. The anode is composed of 7 wt% 'lithiophilic' layered reduced graphene oxide with nanoscale gaps that can host metallic lithium. The anode retains up to similar to 3,390 mAh g(-1) of capacity, exhibits low overpotential (similar to 80 mV at 3 mA cm(-2)) and a flat voltage profile in a carbonate electrolyte. A full-cell battery with a LiCoO2 cathode shows good rate capability and flat voltage profiles.
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