新穎尖晶石金屬硫化物於鋰離子電池負極材料之應用

徐鼎浩

doi:10.6840/cycu202100385

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新穎尖晶石金屬硫化物於鋰離子電池負極材料之應用

Applications of Novel Spinel-based Metal Sulfide Anode Materials for Lithium-ion Battery

徐鼎浩 , Masters　　Advisor：劉偉仁　　

繁體中文 DOI： 10.6840/cycu202100385

鋰離子電池；過渡金屬硫化物；高能球磨；溶劑熱法；非原位分析； Lithium-ion battery ； Solvothermal ； Ex-situ analysis ； Transition-metal sulfides ； High energy ball-milling

Abstract │ Reference (96) │ Altmetrics

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The corresponding lithium-ion batteries (LIBs) technology have been widely developed in more than 20 years because of the needing for mobile devices and electric vehicles market. LIBs required not only high energy density but also high specific capacity, therefore providing high capacity and decreased recharge time for electric devices. 
In this study, we focused on CuIn2S4/C composite as anode materials for Li-ion batteries by using hydrothermal reaction and subsequently high energy ball-milling technique. The crystal structure and surface morphology of as-synthesized CuIn2S4 and CuIn2S4/C composite were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM). The reversible capacity of pristine CuIn2S4 sample displays 349 mAh/g and 176 mAh/g at current density of 0.2 A/g and at 1 A/g, respectively. After introducing high energy ball milling with carbon black, the rate capability and reversible capacity of CuIn2S4/C composite anode dramatically improved to 717 mAh/g at 0.2 A/g and 591 mAh/g at 1 A/g, respectively. In addition, the cycle stability of CuIn2S4 is also enhanced. The as-synthesized CuIn2S4/C composite demonstrates as high as 376 mAh/g under 5 A/g for more than 500 cycles without fading. In order to understand reaction mechanism, ex-situ XRD and in-situ XRD measurement of CuIn2S4 anode are carried out during charge and discharge processes. 
	In the second part, we focused on MgIn2S4 by hydrothermal method and used carbon nanotubes to prepare CNT-MgIn2S4 composite material as anode material for lithium-ion battery. When the CNT addition amount is 1 wt.%, it has better electrochemical performance. After 200 cycles, CNT1-MgIn2S4 displays 184 mAh/g at current density of 0.5 A/g. Adding too much CNTs will cause agglomeration, and then lead electrochemical performance not good. With increase the content of CNTs, the impedance also increases. Lastly, we focused on the electrochemical performance of MgIn2S4 involve the use of non-aqueous (PVDF) and aqueous (CMC+SBR) binders. With the aid of CMC+SBR, MgIn2S4 obtained a reversible capacity of 215 mAh/g after 200 cycles at a current density is 0.5 A/g. However, the capacity of the PVDF electrode is 77.3 mAh/g after 200 cycles at a current density is 0.5 A/g. It can be seen that when CMC+SBR is used as the binder, the electrode can still maintain a certain capacity at higher current density, and will not be destroyed.

Reference ( 96 ) 〈TOP〉

[1] 郭迺鋒, 楊浩彥, 林政勳, and 方文秀, "鋰電池產業對台灣經濟發展影響的研究投入產出方法的分析," 2011.
[2] 黃可龍, 王兆翔, and 劉素琴, 鋰離子電池原理與技術. 五南圖書出版公司, 2010.
[3] 李文雄, 鋰電池E世代的能源 (行政院國科會科學發展月刊). 2003.
[4] 許家興. 車輛研測資訊 [Online].
[5] M. S. Whittingham, "Electrical energy storage and intercalation chemistry," Science, vol. 192, no. 4244, pp. 1126-1127, 1976.

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