Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201806752
Keywords
glass fibers; high surface area; lithium metal batteries; long cycle life; upright lithium anodes
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Funding
- National Natural Science Foundation of China [51673199, 51677176]
- Youth Innovation Promotion Association of CAS [2015148]
- Innovation Foundation of DICP [ZZBS201615, ZZBS201708]
- Dalian Science and Technology Star Program [2016RQ026]
- Dalian National Laboratory for Clean Energy [DNL180307]
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The lithium metal anode is the holy grail of the battery field due to its lowest reduction potential and high specific capacity; however, its application is hindered by severe safety hazards and inferior cyclic stability due to dendrites and unstable solid electrolyte interphase (SEI). Aiming at these problems, a coiled Li anode with a unique upright structure is proposed. The upright structure endows coiled Li anode with abundant inner reaction interface/space/mass for lithium deposit/storage/transport, which can induce the inner growth of Li dendrites and SEI. The Li+ transport/deposit behavior and mechanism of coiled Li anode are clarified via in situ observation and numerical simulation. Benefiting from the small volume expansion and sufficient Li+ transport, the coiled Li anodes combined with Li4Ti5O12 cathodes achieve a long life of over 2000 cycles at 5C with a reversible capacity of 129 mAh g(-1) and 100% Coulombic efficiency.
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