화학공학소재연구정보센터
학회 한국화학공학회
학술대회 2021년 봄 (04/21 ~ 04/23, 부산 BEXCO)
권호 27권 1호, p.611
발표분야 에너지 환경
제목 SnBi alloy composites via co-reduction for high performance lithium-ion battery anode
초록 Alloying-based materials, such as tin (Sn) and bismuth (Bi) have attracted great attention as potential anode materials for Lithium-ion batteries (LIBs) due to their high theoretical volumetric capacities of 7246 and 3800 mAh cm‒3, respectively. However, alloying materials exhibit short cycle life because of the severe volume expansion at fully-lithiated state of Li4.4Sn (260 %) and Li3Bi (215 %), which is a great challenge for the practical implementation. To address this issue, bismuth-tin (BiSn) alloy is designed through a co-reduction method using NaBH4 followed by heat treatment at 900 °C. The different working voltage of Bi (0.7‒0.8 V) and Sn (0.4‒0.6 V) will hinder the extreme structural changes that occur upon cycling. At an initial discharge stage, the unreacted Sn phase acts as a buffer during the lithiation of Bi. Meanwhile, the lithiated state of Bi (LixBi) will buffer the contraction when Sn uptake the Li-ions. As a result, BiSn anode achieved a superior discharge capacity of 650 mAh g‒1 at 50mA g‒1. The high tap density of BiSn alloy (2.46 g mL‒1) brings an outstanding volumetric capacity of 1600 mAh cm‒3.
저자 박현서, 김재훈, winda devina
소속 성균관대
키워드 에너지
E-Mail jaehoonkim@skku.edu
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