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Ammonium Vanadium Bronze, (NH4)2V7O16, as a New Lithium Intercalation Host Material

Title
Ammonium Vanadium Bronze, (NH4)2V7O16, as a New Lithium Intercalation Host Material
Authors
Heo, Jongwook W.Bu, HyeriHyoung, JooeunHong, Seung-Tae
DGIST Authors
Heo, Jongwook W.; Bu, Hyeri; Hyoung, Jooeun; Hong, Seung-Tae
Issue Date
2020-04
Citation
Inorganic Chemistry, 59(7), 4320-4327
Type
Article
Article Type
Article
Keywords
BOND-VALENCE PARAMETERSCATHODE MATERIALFACILE SYNTHESISELECTROCHEMICAL PERFORMANCECRYSTAL-STRUCTUREVANADATE CATHODESTABILITYPENTOXIDENANORODSOXIDES
ISSN
0020-1669
Abstract
A new type of ammonium vanadium bronze, (NH4)2V7O16, was synthesized by the hydrothermal method. The triclinic crystal structure (P1¯) is successfully identified by the single-crystal X-ray diffraction method. The layered structure is similar to that of other vanadium bronzes but with an unprecedented stoichiometry and crystal structure. The structure is composed of a stack of V7O16 layers along the c axis, and two NH4 + ions occupy the interlayer space per formula unit. Each ammonium ion is hydrogen-bonded to four lattice oxygen atoms, resulting in a stable structure with a large interlayer space, thus enabling the intercalation of various guest ions. Lithium ions are electrochemically intercalated into (NH4)2V7O16, with an initial discharge capacity of 232 mAh g-1 and an average discharge voltage of 2 V (vs Li/Li+). Upon the first discharge, lithium ions are inserted, whereas ammonium ions are extracted. Upon charging, a reverse reaction takes place. However, only a fraction of the extracted ammonium ions are reaccommodated. Despite the small quantity, the reinsertion of ammonium ions contributes crucially to the structural stability, improving the electrochemical performance. These results could provide a general understanding of the intercalation mechanism of host materials containing ammonium ions. In addition, (NH4)2V7O16 intercalates Na+ ions reversibly, implying a potential capability as a host material for other guest ions. © 2020 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/11664
DOI
10.1021/acs.inorgchem.9b03160
Publisher
American Chemical Society
Related Researcher
  • Author Hong, Seung-Tae Battery Materials Discovery Laboratory
  • Research Interests Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries, New inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Ca, Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
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Collection:
Department of Energy Science and EngineeringBattery Materials Discovery Laboratory1. Journal Articles


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