Journal
ADVANCED MATERIALS
Volume 30, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201800884
Keywords
carbon nanotube paper; lithium-metal anodes; robust structure; ultrahigh capacity
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Funding
- National Natural Science Foundation of China [21373197, 51672262, 51761145046]
- Fundamental Research Funds for the Central Universities [WK3430000003]
- 100 Talents Program of the Chinese Academy of Sciences
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There has been a renewed interest in using lithium (Li) metal as an anode material for rechargeable batteries owing to its high theoretical capacity of 3860 mA h g(-1). Despite extensive research, modifications to effectively inhibit Li dendrite growth still result in decreased Li loading and Li utilization. As a result, real capacities are often lower than values expected, if the total mass of the electrode is taken into consideration. Herein, a lightweight yet mechanically robust carbon nanotube (CNT) paper is demonstrated as a freestanding framework to accommodate Li metal with a Li mass fraction of 80.7 wt%. The highly conductive network made of sp2-hybridized carbon effectively inhibits formation of Li dendrites and affords a favorable coulombic efficiency of >97.5%. Moreover, the Li/CNT electrode retains practical areal and gravimetric capacities of 10 mA h cm(-2) and 2830 mA h g(-1) (vs the mass of electrode), respectively, with 90.9% Li utilization for 1000 cycles at a current density of 10 mA cm(-2). It is demonstrated that the robust and expandable nature is a distinguishing feature of the CNT paper as compared to other 3D scaffolds, and is a key factor that leads to the improved electrochemical performance of the Li/CNT anodes.
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