Elucidating the mechanism underlying the augmented capacity of MoO2 as an anode material in Li-ion batteries

被引:9
作者
Wang, Hua [1 ,2 ]
Hao, Wei [3 ]
Li, Tianyi [4 ]
Li, Xintong [1 ]
Chang, Kai [1 ]
Zhou, Xinwei [5 ]
Hou, Dewen [5 ]
Hashem, Ahmed M. [6 ]
Hwang, Gyeong S. [3 ]
Liu, Yuzi [5 ]
Sun, Cheng-Jun [4 ]
Abdel-Ghany, Ashraf E. [6 ]
El-Tawil, Rasha S. [6 ]
Mohamed, Hanaa Abuzeid [6 ]
Abbas, Somia M. [6 ]
Mullins, C. Buddie [3 ]
Julien, Christian M. [7 ]
Zhu, Likun [1 ]
机构
[1] Indiana Univ Purdue Univ, Dept Mech & Energy Engn, Indianapolis, IN 46202 USA
[2] Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA
[3] Univ Texas Austin, Dept Chem Engn & Chem, Austin, TX 78712 USA
[4] Argonne Natl Lab, Adv Photon Source, Lemont, IL 60439 USA
[5] Argonne Natl Lab, Ctr Nanoscale Mat, Lemont, IL 60439 USA
[6] Natl Res Ctr, Inorgan Chem Dept, 33 El Bohouth St, Dokki Giza 12622, Egypt
[7] Sorbonne Univ, Inst Mineral Phys Mat & Cosmol IMPMC, UMR CNRS 7590, 4 Pl Jussieu, F-75752 Paris, France
关键词
ELECTROCHEMICAL PERFORMANCE; ELECTRODE MATERIALS; CYCLIC STABILITY; METAL FLUORIDES; TIO2; ANATASE; NANO-IONICS; LITHIUM; STORAGE; NANOPARTICLES; CARBON;
D O I
10.1039/d3ta04794f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Transition-metal oxide anode materials have been observed to possess an intriguing surplus of capacity beyond the expected values based on conversion reaction. However, the mechanisms behind this phenomenon have remained contentious and elusive. This study focuses on synthesized nanosized molybdenum dioxide and its electrochemical performance as an anode material for Li-ion batteries. Our findings reveal a substantial increase in capacity upon cycling, achieving approximately 1688 mA h g(-1), nearly double the theoretical capacity, after 700 cycles at a 1C rate. To elucidate the mechanisms underlying this augmented capacity, a comprehensive analysis employing in situ and ex situ X-ray diffraction, X-ray absorption spectroscopy, scanning electron microscopy, and transmission electron microscopy was conducted at various stages of the Li-ion cell cycling. Our results indicate that no conversion reaction occurs during the initial discharge phase, with Li2O and Mo remaining undetected. Instead, Li0.98MoO2 is generated upon lithiation. Further materials characterization employing electron energy loss spectroscopy and energy-dispersive X-ray spectroscopy on the cycled electrode suggests the potential formation of a metallic Li-rich layer at the interface of the Li-ion intercalated phase subsequent to the formation of Li0.98MoO2, contributing to the surplus Li storage. Moreover, electrochemical impedance spectroscopy coupled with ex situ SEM and TEM analyses reveals that alterations in particle size and morphology, along with changes in the solid electrolyte interphase (SEI) resistance, are instrumental in the capacity variation observed upon cycling.
引用
收藏
页码:23012 / 23025
页数:14
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