講演情報
[23p-P05-52]Biomass derived ultra-low specific area 3D porous carbon-based high-energy density Sodium ion battery
〇(PC)Lavanya Thirugnanam1, Raghunath Sahoo1, Premkumar S1, Ramaprabhu Sundara1 (1.Indian Institute of Technology)
キーワード：
Energy Storage、Biowaste、Sodium Ion Batteries
Recently, Na ion batteries (SIBs) are most promising alternative for Li ion batteries due to resource abundance, appropriate redox potential, safety, eco-friendly and significantly low cost of Na sources. However, it is a more arduous challenge to explore suitable and stable electrode materials for high efficiency SIBs due to larger ionic radius (1.06 Å) and greater atomic mass (22.99 g/mol of sodium. Hard carbon, a type of disordered carbon with micro-pores and turbo-static domains, has emerged as a potential anode material for sodium batteries. The utilization of waste biomaterials for hard carbon synthesis not only addresses environmental concerns associated with waste disposal but also offers a sustainable approach to electrode material production. The present study investigates the feasibility of repurposing different plant-based biomass such as agricultural residues into high performance hard carbon anodes for Na ion batteries. We achieved an interlayer distance of 0.38nm, which enables great intercalation and de-intercalation of Na ions. This hard carbon achieved an ultra-low specific surface area of 1.54 m2/g. These anodes demonstrate promising electrochemical properties, including high specific capacity, high initial Columbic efficiency, excellent cycling stability, and enhanced rate capability. This is owing to the formation of stable SEI layer and efficient adsorption-intercalation mechanism in lower specific surface area hard carbons. The assembled CR2032 cell with hard carbon as anode with 1M NaClO4 in TEGDME electrolyte, and sodium as the cathode, delivered a high reversible specific capacity of 290 mAh/g at 30 mA/g current density with good initial columbic efficiency. The cell performed the excellent rate capability and high cyclic stability (210 mAh/g after 100 cycles). To replace LIBs due to high cost and safety issue, it is anticipated that this work may impact on low cost and high energy density of SIB to address the energy demand.