期刊
JOURNAL OF POWER SOURCES
卷 340, 期 -, 页码 294-301出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.11.076
关键词
NASICON-type ceramic; Anode-protecting membrane; Hybrid Li-air battery; Aqueous battery; Energy efficiency; 2e(-) oxygen reduction mechanism
资金
- National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP 10-2012-6]
- NUS Centre for Energy Research
Due to their extremely high specific energy, rechargeable Li-air batteries could meet the demand for large-scale storage systems to integrate renewable sources into the power grid. Li-air batteries with aqueous catholytes with high solubility of discharge products have a higher potential to reach their slightly lower theoretical limits in practical devices. In this work, we demonstrate aqueous and hybrid Li-air batteries with NASICON-type Li(1+x)A(x)Ge(2-x)(PO4)(3) ceramic as anode-protecting membrane. The LAGP ceramic pellets with room temperature conductivity >10(-4) S cm(-1) are synthesized by melt quenching and subsequently annealed based on our optimized heat treatment cycle. Hybrid Li-air batteries are assembled by sandwiching LAGP membranes between Li-anode chamber and catholyte solutions (of various pH values) with CNT/Pt as air-cathode. When the two electron reduction mechanism prevails, overpotentials below 0.2 V are achieved for currents up to 0.07 mA cm(-2) leading to energy efficiencies exceeding 98%. (C) 2016 Elsevier B.V. All rights reserved.
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