The structure and composition of the anode in a Li-ion rechargeable battery is critical to the energy density, power density, cycle life, and safety of the overall battery. I will discuss electrodeposited M-Sb (where M = Ni, Cu, Zn) thin films and nanowire arrays that have been investigated as alloy anodes for Li-ion batteries to elucidate the effects of both the film composition and substrate interactions on cycling stability and lifetime. Thin films of composition Cu<sub>x</sub>Sb (0&lt;x&lt;2) exhibit the longest cycle lifetimes nearest x=1. Additionally, the Cu-Sb films exhibit shorter cycle lifetimes when electrodeposited onto Cu substrates when compared to Ni substrates. Ex-situ characterization and differential capacity analysis of the anodes reveal that significant interdiffusion occurs during cycling between Sb films and Cu substrates. Interdiffusion results in mechanical weakening of the film-substrate interface that exacerbates film delamination and decreases cycle lifetimes of Cu-Sb films on Cu substates regardless of the film’s composition. The results discussed will demonstrate that important composition and substrate factors for anode cycling performance are being developed that are likely applicable to other systems.

Electrodeposition of high energy density anodes for rechargeable batteries: Unusual anode-substrate interactions

255th National Meeting (2018)

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