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Lee, Hyun-Wook
Energy Storage and Electron Microscopy Laboratory
Research Interests
  • Energy storage, secondary batteries, transmission electron microscopy, real time analysis

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Interconnected hollow carbon nanospheres for stable lithium metal anodes

Cited 69 times inthomson ciCited 77 times inthomson ci
Title
Interconnected hollow carbon nanospheres for stable lithium metal anodes
Author
Zheng, GuangyuanLee, Seok WooLiang, ZhengLee, Hyun-WookYan, KaiYao, HongbinWang, HaotianLi, WeiyangChu, StevenCui, Yi
Keywords
RECHARGEABLE BATTERIES; POLYMER ELECTROLYTES; ETHER ELECTROLYTES; CYCLING EFFICIENCY; SURFACE-CHEMISTRY; LI7LA3ZR2O12; MECHANISMS; LITHIATION; DEPOSITION; SYSTEMS
Issue Date
2014-08
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE NANOTECHNOLOGY, v.9, no.8, pp.618 - 623
Abstract
For future applications in portable electronics, electric vehicles and grid storage, batteries with higher energy storage density than existing lithium ion batteries need to be developed. Recent efforts in this direction have focused on high-capacity electrode materials such as lithium metal, silicon and tin as anodes, and sulphur and oxygen as cathodes. Lithium metal would be the optimal choice as an anode material, because it has the highest specific capacity (3,860 mAh g(-1)) and the lowest anode potential of all. However, the lithium anode forms dendritic and mossy metal deposits, leading to serious safety concerns and low Coulombic efficiency during charge/discharge cycles. Although advanced characterization techniques have helped shed light on the lithium growth process, effective strategies to improve lithium metal anode cycling remain elusive. Here, we show that coating the lithium metal anode with a monolayer of interconnected amorphous hollow carbon nanospheres helps isolate the lithium metal depositions and facilitates the formation of a stable solid electrolyte interphase. We show that lithium dendrites do not form up to a practical current density of 1 mA cm(-2). The Coulombic efficiency improvesto similar to 99% for more than 150 cycles. This is significantly better than the bare unmodified samples, which usually show rapid Coulombic efficiency decay in fewer than 100 cycles. Our results indicate that nanoscale interfacial engineering could be a promising strategy to tackle the intrinsic problems of lithium metal anodes.
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DOI
10.1038/NNANO.2014.152
ISSN
1748-3387
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ECHE_Journal Papers
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