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Artificial Solid‐Electrolyte Interphase Enabled High‐Capacity and Stable Cycling Potassium Metal Batteries
Author(s) -
Wang Huwei,
Hu Junyang,
Dong Jiahui,
Lau Kah Chun,
Qin Lei,
Lei Yu,
Li Baohua,
Zhai Dengyun,
Wu Yiying,
Kang Feiyu
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201902697
Subject(s) - anode , materials science , electrolyte , interphase , potassium , dendrite (mathematics) , chemical engineering , potassium ion battery , carbon nanotube , metal , carbon fibers , battery (electricity) , nanotechnology , electrode , composite material , metallurgy , chemistry , lithium vanadium phosphate battery , genetics , engineering , biology , power (physics) , geometry , mathematics , physics , quantum mechanics , composite number
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.