5 years ago

High-Performance Aqueous Rechargeable Li-Ni Battery Based on Ni(OH)2/NiOOH Redox Couple with High Voltage

High-Performance Aqueous Rechargeable Li-Ni Battery Based on Ni(OH)2/NiOOH Redox Couple with High Voltage
Jian Li, Jian Pu, Zheng Huang, Ming Zhang, Bo Chi, Yingpeng Gong, Zhongrong Shen
New energy storage and conversion systems require large-scale, cost-effective, good safety, high reliability, and high energy density. This study demonstrates a low-cost and safe aqueous rechargeable lithium-nickel (Li-Ni) battery with solid state Ni(OH)2/NiOOH redox couple as cathode and hybrid electrolytes separated by a Li-ion-conductive solid electrolyte layer. The proposed aqueous rechargeable Li-Ni battery exhibits an approximately open-circuit potential of 3.5 V, outperforming the theoretic stable window of water 1.23 V, and its energy density can be 912.6 W h kg-1, which is much higher than that of state-of-the-art lithium ion batteries. The use of a solid-state redox couple as cathode with a metallic lithium anode provides another postlithium chemistry for practical energy storage and conversion. An in situ formed solid state Ni(OH)2/NiOOH redox couple as cathode is reported for a novel aqueous rechargeable Li-Ni battery with high voltage. The battery with redox couple cathode is able to deliver a high mass specific capacity and energy density, which indicates a potential development direction of these promising materials for advanced energy storage systems.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/aenm.201700155

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