【摘 要】
：
Enabling highly reversible sodium (Na) metal anodes in a polymer electrolyte (PE) system is critical for realizing next-generation batteries with lower cost,higher energy,and improved safety.However,the uneven Na deposition and high Na/PE interphase resis
【机 构】
：
Engineering Drive,Thayer School of Engineering,Dartmouth College,Hanover,NH 03755,USA
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Enabling highly reversible sodium (Na) metal anodes in a polymer electrolyte (PE) system is critical for realizing next-generation batteries with lower cost,higher energy,and improved safety.However,the uneven Na deposition and high Na/PE interphase resistance lead to poor reversibility and short cycle life of Na metal anodes.To tackle these problems,here a variety of metal nanoparticles (M-np,M =Al,Sn,In or Au) are deposited onto copper (Cu) foils to synthesize binder-free M-np@Cu substrates for Na plating/stripping.Notably,the Au-np@Cu substrate provides abundant preferential nucleation/growth sites,decreasing Na nucleation barrier and thus promoting uniform Na deposition.Accordingly,stable Na metal anodes are achieved with high reversible capacities,long cycle life,and high usage of Na.With the Au-np@Cu/Na anode and PE,the full cell using a commercial bulk sulfur cathode exhibits a reversible capacity of ＞400 mAh g-1 with near-100％ Coulombic efficiency over 200 cycles.
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