Journal
JOURNAL OF POWER SOURCES
Volume 426, Issue -, Pages 151-161Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2019.03.119
Keywords
Aqueous Al-ion battery; High capacity cathode; Conversion-type electrode; Electrode dissolution; pH control; Electrolyte
Funding
- National Research Foundation of Singapore [NRFI2017-08/NRF2016NRF-NRFI001-22]
- Ministry of Education (MOE) Singapore [MOE2015-T2-1-046]
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Developing an aluminum-ion aqueous battery is extremely attractive for prospects of creating a super cheap, environmentally friendly and safe energy storage system. However, a lack of reversible cathode materials hampers the use of metallic Al as a high-capacity anode in an aqueous electrolyte. As opposed to insertion-type cathodes, the performance of conversion-type cathodes for Al-ion electrochemistry in an aqueous electrolytic environment remains poorly explored. As a first attempt to understand the performance of such conversion type materials for Al-ion intake, we herein report FeVO4 as a potential cathode material with a significantly high capacity of 350 mA h g(-1). We use a combination of inhouse and synchrotron-based characterization techniques to confirm Al-ion electrochemical reaction with FeVO4, and also determine how electrolyte pH has a mechanistic influence on the reversibility of aluminum-ion aqueous batteries.
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