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Electrochemical Lithium Storage Performance of Molten Salt Derived V2SnC MAX Phase

Li, Youbing (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
Ma, Guoliang (author)
Sichuan Univ, Peoples R China
Shao, Hui (author)
Univ Toulouse III Paul Sabatier, France
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Xiao, Peng (author)
Sichuan Univ, Peoples R China
Lu, Jun (author)
Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
Xu, Jin (author)
Dongguan Univ Technol, Peoples R China
Hou, Jinrong (author)
Tongji Univ, Peoples R China
Chen, Ke (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
Zhang, Xiao (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
Li, Mian (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
Persson, Per O A (author)
Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
Hultman, Lars (author)
Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
Eklund, Per (author)
Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
Du, Shiyu (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
Chai, Zhifang (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
Huang, Zhengren (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
Jin, Na (author)
Sichuan Univ, Peoples R China
Ma, Jiwei (author)
Tongji Univ, Peoples R China
Liu, Ying (author)
Sichuan Univ, Peoples R China
Lin, Zifeng (author)
Sichuan Univ, Peoples R China
Huang, Qing (author)
Chinese Acad Sci, Peoples R China; Qianwan Inst CNiTECH, Peoples R China
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 (creator_code:org_t)
2021-07-22
2021
English.
In: Nano-Micro Letters. - : Springer. - 2311-6706 .- 2150-5551. ; 13:1
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • MAX phases are gaining attention as precursors of two-dimensional MXenes that are intensively pursued in applications for electrochemical energy storage. Here, we report the preparation of V2SnC MAX phase by the molten salt method. V2SnC is investigated as a lithium storage anode, showing a high gravimetric capacity of 490 mAh g(-1) and volumetric capacity of 570 mAh cm(-3) as well as superior rate performance of 95 mAh g(-1) (110 mAh cm(-3)) at 50 C, surpassing the ever-reported performance of MAX phase anodes. Supported by operando X-ray diffraction and density functional theory, a charge storage mechanism with dual redox reaction is proposed with a Sn-Li (de)alloying reaction that occurs at the edge sites of V2SnC particles where Sn atoms are exposed to the electrolyte followed by a redox reaction that occurs at V2C layers with Li. This study offers promise of using MAX phases with M-site and A-site elements that are redox active as high-rate lithium storage materials.

Subject headings

NATURVETENSKAP  -- Kemi -- Oorganisk kemi (hsv//swe)
NATURAL SCIENCES  -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)

Keyword

MAX phase; Molten salt; Lithium storage; High-rate; Energy storage

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ref (subject category)
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