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PhD Student, The University of Queensland

PINBOARD SUMMARY

Devlopment of high performance sodium-ion batteries using hard carbon material based anodes.

Lithium-ion batteries (LIBs) power most portable electronic devices today. However, the geographical limitation of lithium might increase the battery price in near future and also make the supply chain susceptible to political instabilities. Therefore, the next generation of energy storage must rely on something other than the Li-ion technology. Sodium (Na) is one of the promising candidates that can replace Li, not only because of its abundance but also due to similar chemistries with Li intercalation. To commercialise sodium-ion battery (NIBs) technology, it is imperative to find a suitable anode material that can reversibly interact with sodium ions. Therefore, mywork aims to study carbonaceous materials derived from biomass as high performance anodes in NIBs.

8 ITEMS PINNED

Environmentally stable interface of layered oxide cathodes for sodium-ion batteries.

Abstract: Sodium-ion batteries are strategically pivotal to achieving large-scale energy storage. Layered oxides, especially manganese-based oxides, are the most popular cathodes due to their high reversible capacity and use of earth-abundant elements. However, less noticed is the fact that the interface of layered cathodes always suffers from atmospheric and electrochemical corrosion, leading to severely diminished electrochemical properties. Herein, we demonstrate an environmentally stable interface via the superficial concentration of titanium, which not only overcomes the above limitations, but also presents unique surface chemical/electrochemical properties. The results show that the atomic-scale interface is composed of spinel-like titanium (III) oxides, enhancing the structural/electrochemical stability and electronic/ionic conductivity. Consequently, the interface-engineered electrode shows excellent cycling performance among all layered manganese-based cathodes, as well as high-energy density. Our findings highlight the significance of a stable interface and, moreover, open opportunities for the design of well-tailored cathode materials for sodium storage.The interface of layered cathodes for sodium ion batteries is subject to atmospheric and electrochemical corrosions. Here, the authors demonstrate an environmentally stable interface via titanium enriched surface reconstruction in a layered manganese-based oxide.

Pub.: 27 Jul '17, Pinned: 16 Aug '17