Rechargeable aqueous Zn/MnO2 batteries are promising for large-scale grid energy storage applications owing to their low cost, environmentally benign constituents, excellent safety, and relatively high energy density. Their usage, however, is largely hampered by the fast capacity fade. The complexity of the reactions has resulted in long-standing ambiguities of the chemical pathways in Zn/MnO2. In this talk, I will discuss our latest work on discerning the reaction mechanisms of rechargeable Zn/MnO2 batteries. We find that both H+/Zn2+intercalation and conversion reactions occur at different voltages and that the rapid capacity fading can clearly be ascribed to the rate-limiting and irreversible conversion reactions at a lower voltage. By limiting the irreversible conversion reactions at ∼1.26 V, we successfully demonstrated high power and long life that are superior to most of the reported Zinc-ion Batteries or even some lithium-ion batteries.

Reaction mechanisms for long-life rechargeable Zn/MnO2 batteries

2019 Fall National Meeting

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