119th General Meeting of the KCS

Type Poster Presentation
Area 전기화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code ELEC.P-522
Subject One-Pot Synthesis of the Li3VO4 with Nitrogen-Doped Carbon Coating Layers as an Anode Material for Lithium-Ion Batteries
Authors 박한솔, 박미지, 김종식*
동아대학교 화학과, Korea
Abstract Lithium-ion batteries (LIBs) have been utilized as effective power supplies for a wide range of application such as laptops, mobile phones, and cameras owing to low cost, high capacity, and long life cycles. Nevertheless, because graphite has a low theoretical capacity (372 mAh g-1), it is necessary to explore an alternative anode material of graphite due to the increased demand of LIBs with large capacities in the fields of electric vehicles and hybrid electric vehicles. Lithium vanadate (Li3VO4) has been recently investigated as a potential anode material for lithium-ion batteries (LIBs) because it has advantages of high theoretical capacity of 394 mAh g-1, small volume changes, and fast diffusion of lithium ions during charge/discharge processes. However, pristine Li3VO4 (LVO) has a low initial Coulombic efficiency and poor electrochemical performance (especially poor rate capacity) because of its low electrical conductivity. In this work, the nitrogen-doped carbon coated Li3VO4 (NC-LVO) was successfully fabricated via facile hydrothermal and subsequent heat treatment methods using dopamine (2-(3, 4-dihydroxyphenyl)ethylamine) which includes nitrogen and carbon functional groups. Compared with the pristine LVO, the NC-LVO sample showed enhanced the electrochemical performances with the reversible capacity of about 426 mAh g-1 with a capacity fading rate of about 0.024% per cycle during the 2-100 cycles at 0.5 C (1 C = 394 mA g-1) in the voltage ranges of 0.01-3.0 V. Furthermore, the NC-LVO also exhibited the improved initial Coulombic efficiency with about 70% and rate capabilities at various current densities (0.1-20 C).
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