Journal
ADVANCED MATERIALS
Volume 31, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201900567
Keywords
Aqueous Zn-MnO2 batteries; high-rate batteries; joint charge storage; battery reaction mechanisms
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Funding
- U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [KC020105-FWP12152]
- China Scholarship Council (CSC)
- DOE Office of Biological and Environmental Research and located at PNNL
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Aqueous rechargeable zinc-manganese dioxide batteries show great promise for large-scale energy storage due to their use of environmentally friendly, abundant, and rechargeable Zn metal anodes and MnO2 cathodes. In the literature various intercalation and conversion reaction mechanisms in MnO2 have been reported, but it is not clear how these mechanisms can be simultaneously manipulated to improve the charge storage and transport properties. A systematical study to understand the charge storage mechanisms in a layered delta-MnO2 cathode is reported. An electrolyte-dependent reaction mechanism in delta-MnO2 is identified. Nondiffusion controlled Zn2+ intercalation in bulky delta-MnO2 and control of H+ conversion reaction pathways over a wide C-rate charge-discharge range facilitate high rate performance of the delta-MnO2 cathode without sacrificing the energy density in optimal electrolytes. The Zn-delta-MnO2 system delivers a discharge capacity of 136.9 mAh g(-1) at 20 C and capacity retention of 93% over 4000 cycles with this joint charge storage mechanism. This study opens a new gateway for the design of high-rate electrode materials by manipulating the effective redox reactions in electrode materials for rechargeable batteries.
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