Journal
ENERGY STORAGE MATERIALS
Volume 11, Issue -, Pages 170-175Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2017.10.002
Keywords
Solid-state Li-O-2 battery; Interfacial resistance; Charge overpotential; Solar-driven charge process; Electric energy efficiency
Funding
- Advanced Low Carbon Technology Research and Development Program (ALCA) of Japan project
- National Basic Research Program of China [2014CB932300]
- National Natural Science Foundation (NSF) of China [21633003, 21373111]
- CSC (China Scholarship Council) scholarship
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Although solid-state Li-O-2 battery displays the advantages of high safety and energy density as an energy storage device, the lack of success would be attributed to the unfavorable charge overpotential arisen from solid-solid interface. To address the above thorny problem, herein, a solar-driven solid-state Li-ion O-2 battery is proposed and realized, wherein the charge process is achieved via direct photo-oxidation of discharge product (Li2O2) by photoexcited holes from ZnS photocatalyst. The solar-driven charge process enables the solid-state Li-ion O-2 battery with a low charge voltage of 2.08 V and high electric energy efficiency (113%, based on output electric energy/input electric energy). These encouraging results provide an alternative way to reduce the charge overpotential of solid-state Li-O-2 batteries.
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