Tracking the Chemical and Structural Evolution of the TiS 2 Electrode in the Lithium-Ion Cell Using Operando X-ray Absorption Spectroscopy
學年 106
學期 2
出版（發表）日期 2018-06-01
作品名稱 Tracking the Chemical and Structural Evolution of the TiS 2 Electrode in the Lithium-Ion Cell Using Operando X-ray Absorption Spectroscopy
作品名稱（其他語言）
著者 Liang Zhang; Dan Sun; Jun Kang; Hsiao-Tsu Wang; Shang-Hsien Hsieh; Way-Faung Pong, etc.
單位
出版者
著錄名稱、卷期、頁數 Nano Letters 18(7), p.4506-4515
摘要 As the lightest and cheapest transition metal dichalcogenide, TiS2 possesses great potential as an electrode material for lithium batteries due to the advantages of high energy density storage capability, fast ion diffusion rate, and low volume expansion. Despite the extensive investigation of its electrochemical properties, the fundamental discharge–charge reaction mechanism of the TiS2 electrode is still elusive. Here, by a combination of ex situ and operando X-ray absorption spectroscopy with density functional theory calculations, we have clearly elucidated the evolution of the structural and chemical properties of TiS2 during the discharge–charge processes. The lithium intercalation reaction is highly reversible and both Ti and sulfur are involved in the redox reaction during the discharge and charge processes. In contrast, the conversion reaction of TiS2 is partially reversible in the first cycle. However, Ti—O related compounds are developed during electrochemical cycling over extended cycles, which results in the decrease of the conversion reaction reversibility and the rapid capacity fading. In addition, the solid electrolyte interphase formed on the electrode surface is found to be highly dynamic in the initial cycles and then gradually becomes more stable upon further cycling. Such understanding is important for the future design and optimization of TiS2 based electrodes for lithium batteries.
關鍵字 Lithium ion batteries;TiS2;electronic structure;in situ and operando;X-ray absorption spectroscopy
語言 en_US
ISSN 1530-6984
期刊性質 國外
收錄於 SCI EI ESCI
產學合作
通訊作者
審稿制度 否
國別 USA
公開徵稿
出版型式 ,電子版
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/117036 )