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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, Hyeri; Hyoung, Jooeun; Hong, 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 PARAMETERS; CATHODE MATERIAL; FACILE SYNTHESIS; ELECTROCHEMICAL PERFORMANCE; CRYSTAL-STRUCTURE; VANADATE CATHODE; STABILITY; PENTOXIDE; NANORODS; OXIDES
- 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
-
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Hong, Seung-Tae
Battery Materials Discovery Laboratory
-
Research Interests
Magnesium, calcium, and zinc ion batteries; lithium all-solid-state batteries; Inorganic materials discovery; Solid state chemistry; Crystallography; Mg, Ca, Zn 이온 이차전지; 리튬 전고체전지; 신 무기재료 합성; 고체화학; 결정화학
- Files:
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- Collection:
- Department of Energy Science and EngineeringBattery Materials Discovery Laboratory1. Journal Articles
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