期刊
NATURE NANOTECHNOLOGY
卷 14, 期 6, 页码 594-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41565-019-0427-9
关键词
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资金
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the US Department of Energy (DOE) through the Advanced Battery Materials Research (BMR) program (Battery500 Consortium) [DE-AC02-05CH11231]
- DOE's Office of Biological and Environmental Research
- DOE [DE-AC05-76RL01830]
Despite considerable efforts to stabilize lithium metal anode structures and prevent dendrite formation, achieving long cycling life in high-energy batteries under realistic conditions remains extremely difficult due to a combination of complex failure modes that involve accelerated anode degradation and the depletion of electrolyte and lithium metal. Here we report a self-smoothing lithium-carbon anode structure based on mesoporous carbon nanofibres, which, coupled with a lithium nickel-manganese-cobalt oxide cathode with a high nickel content, can lead to a cell-level energy density of 350-380 Wh kg(-1) (counting all the active and inactive components) and a stable cycling life up to 200 cycles. These performances are achieved under the realistic conditions required for practical high-energy rechargeable lithium metal batteries: cathode loading >= 4.0 mAh cm(-2), negative to positive electrode capacity ratio <= 2 and electrolyte weight to cathode capacity ratio <= 3 g Ah(-1). The high stability of our anode is due to the amine functionalization and the mesoporous carbon structures that favour smooth lithium deposition.
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