Brass foil as negative current collector for anode-free Li-metal batteries
Although anode-free lithium metal batteries(AF-LMBs)have the advantages of high energy density and simple structure,the irreversible deposition/stripping process of lithium metal at the negative current collector interface and the side reaction with the electrolyte will consume the limited active lithium ions and result in the rapid capacity decay of the battery.Developing high-performance negative current collector is one of the effective strategies for prolonging the durable life of AF-LMBs.Hence,the electrochemical performance of commercial brass foil(F-Cu-Zn)as a negative current collector in AF-LMBs was investigated in this work.Meanwhile,the structural evolution of F-Cu-Zn electrodes during cycling process was also revealed by combining various characterization techniques.The results show that,compared with commercial Cu foils(F-Cu),F-Cu-Zn foils with abundant lithiophilic sites can induce uniform nucleation and growth of lithium metal.Therefore,the cycling life increases from 75 to 117 in the assembled F-Cu-Zn||NCM712 soft pack battery at room temperature.In addition,the Zn element in the F-Cu-Zn electrode will be continuously dissolved into the electrolyte during the cycle,resulting in the formation of a three-dimensional porous structure on the surface of the electrode.
anode-free lithium metal batterybrass current collectornickel-rich ternary cathodelithiophilic sites
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