Multifunctional Properties of Al2O3/Polyacrylonitrile Composite Coating on Cu to Suppress Dendritic Growth in Anode-Free Li-Metal Battery

• DOI: 10.1021/acsaem.0c01080
• Publication Date: 2020-07-21T22:39:04Z
• Authors: Niguse Aweke Sahalie; Zewdu Tadesse Won...; Wei-Nien Su; Misganaw Adigo Weret; Fekadu Wubatu Fenta; Gebregziabher Brh...; Chen-Jui Huang; Ya-Ching Hsu; Bing Joe Hwang
• Keywords: Polyacrylonitrile

The utilization of an anode-free lithium-metal battery (AFLMB) is pivotal in meeting the high-energy-density demand for portable electronic devices and vehicles. However, dendritic growth lithium (Li) continuous SEI formation on Copper (Cu) current collector limits lifetime a cell. Here we report effect milled Al2O3/polyacrylonitrile (PAN) composite layer (AOP) coated Cu, as AOP@Cu, to encourage compact smoother Li+ deposition extracted from NMC (333) cathode. excellent wettable nature AOP promotes uniform ionic flux improved kinetics. multifunctional offers moderate mechanical support sufficient strength suppress growth. Li–Al–O/Al2O3 species at bottom part reveals AOP's lithiophilicity form new components, besides Al–F, by regulating deposition. PAN synergism manifested its flexible binding role nitrogen content that has affinity Li+. resulting AOP@Cu||NMC AOP@Cu||Li cells demonstrated cycling stability Coulombic efficiency. An cell run 0.2 mA cm–2 exhibits first cycle discharge capacity 160 mAh g–1 retains 30% after 82 cycles, whereas Cu||NMC ∼30% only 52 cycles.