Journal
ADVANCED ENERGY MATERIALS
Volume 9, Issue 43, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201902697
Keywords
artificial solid-electrolyte interphase; dendrite-free deposition; potassiated carbon nanotubes; potassium metal anodes
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Funding
- National Natural Science Foundation of China [51772167]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01N111]
- Shenzhen Basic Research Project [JCYJ20170412171311288, JCYJ20170817162443934]
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Secondary batteries based on earth-abundant potassium metal anodes are attractive for stationary energy storage. However, suppressing the formation of potassium metal dendrites during cycling is pivotal in the development of future potassium metal-based battery technology. Herein, a promising artificial solid-electrolyte interphase (ASEI) design, simply covering a carbon nanotube (CNT) film on the surface of a potassium metal anode, is demonstrated. The results show that the spontaneously potassiated CNT framework with a stable self-formed solid-electrolyte interphase layer integrates a quasi-hosting feature with fast interfacial ion transport, which enables dendrite-free deposition of potassium at an ultrahigh capacity (20 mAh cm(-2)). Remarkably, the potassium metal anode exhibits an unprecedented cycle life (over 1000 cycles, over 2000 h) at a high current density of 5 mA cm(-2) and a desirable areal capacity of 4 mAh cm(-2). Dendrite-free morphology in carbon-fiber and carbon-black-based ASEI for potassium metal anodes, which indicates a broader promise of this approach, is also observed.
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