Discovery of abnormal lithium-storage sites in molybdenum dioxide electrodes

Jeong Kuk Shon, Hyo Sug Lee, Gwi Ok Park, Jeongbae Yoon, Eunjun Park, Gyeong Su Park, Soo Sung Kong, Mingshi Jin, Jae-Man Choi, Hyuk Chang, Seokgwang Doo, Ji Man Kim (), Won-Sub Yoon (), Chanho Pak, Hansu Kim () and Galen D. Stucky
Additional contact information
Jeong Kuk Shon: Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd.
Hyo Sug Lee: Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd.
Gwi Ok Park: Sungkyunkwan University
Jeongbae Yoon: Sungkyunkwan University
Eunjun Park: Hanyang University
Gyeong Su Park: Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd.
Soo Sung Kong: Sungkyunkwan University
Mingshi Jin: Key Laboratory of Natural Resource of the Changbai Mountain and Functional Molecular (Yanbian University), Ministry of Education
Jae-Man Choi: Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd.
Hyuk Chang: Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd.
Seokgwang Doo: Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd.
Ji Man Kim: Sungkyunkwan University
Won-Sub Yoon: Sungkyunkwan University
Chanho Pak: Fuel Cell Group, Corporate R&D Center, Samsung SDI Co., Ltd.,
Hansu Kim: Hanyang University
Galen D. Stucky: University of California

Nature Communications, 2016, vol. 7, issue 1, 1-9

Abstract: Abstract Developing electrode materials with high-energy densities is important for the development of lithium-ion batteries. Here, we demonstrate a mesoporous molybdenum dioxide material with abnormal lithium-storage sites, which exhibits a discharge capacity of 1,814 mAh g−1 for the first cycle, more than twice its theoretical value, and maintains its initial capacity after 50 cycles. Contrary to previous reports, we find that a mechanism for the high and reversible lithium-storage capacity of the mesoporous molybdenum dioxide electrode is not based on a conversion reaction. Insight into the electrochemical results, obtained by in situ X-ray absorption, scanning transmission electron microscopy analysis combined with electron energy loss spectroscopy and computational modelling indicates that the nanoscale pore engineering of this transition metal oxide enables an unexpected electrochemical mass storage reaction mechanism, and may provide a strategy for the design of cation storage materials for battery systems.

Date: 2016
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DOI: 10.1038/ncomms11049

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