121st General Meeting of the KCS

Type Poster Presentation
Area Electrochemistry
Room No. Event Hall
Time 4월 20일 (금요일) 11:00~12:30
Code ELEC.P-628
Subject High performance MoS2-TiN thin film electrode using co-sputtering for lithium ion battery
Authors Sang-Hyun Moon, Min-Cheol Kim, Ji-Eun Lee, Sojeong Choi1, Eun-Soo Kim, Yeon-Kyung Shin, Kyung-Won Park*
Soongsil University, Korea
1chemical engineering, Soongsil University, Korea
Abstract Since molybdenum disulfide (MoS2) has a layered structure, it has an advantage that migration and storage of lithium ions are easy and that the theoretical capacity is larger than that of graphite which is a negative electrode active material used in current lithium ion batteries. It is expected to be suitable for battery use. However, due to the conversion reaction with lithium, decomposition of Mo and S occurs. The decomposed S reacts with lithium to form Li2S. In other words, not only the amount of active material is reduced by the conversion reaction but also the capacity is reduced due to the volume change occurring during the charging and discharging process, so that the stability is deteriorated. Several studies such as carbon composites, structure control, alloying are under way to overcome these drawbacks. Titanium nitride(TiN) is an inactive material that does not react in the process of insertion and deinsertion of lithium ions, and is known as a material with high electrical conductivity and high structural stability. In this study, we anticipate TiN suppression of the volume change due to the conversion reaction of MoS2 and the electrode stability is improved. The composite of MoS2 and TiN produced a thin film electrode by using the co-sputtering method while maintaining the R. F power of MoS2 and regulating only R. F power of TiN. The produced electrode analysis of the as-prepared samples was performed using field-emission transmission electron microscopy (FE-TEM), and energy dispersive X-ray spectroscopy (EDX). To evaluate the performance of the samples in LIBs, the charge/discharge curves, cyclic voltammograms (CVs) were measured using coin cells.
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