Cited 13 time in webofscience Cited 16 time in scopus

Rhombohedral Potassium-Zinc Hexacyanoferrate as a Cathode Material for Nonaqueous Potassium-Ion Batteries

Title
Rhombohedral Potassium-Zinc Hexacyanoferrate as a Cathode Material for Nonaqueous Potassium-Ion Batteries
Authors
Heo, Jongwook W.Chae, Munseok S.Hyoung, JooeunHong, Seung-Tae
DGIST Authors
Heo, Jongwook W.; Chae, Munseok S.; Hyoung, Jooeun; Hong, Seung-Tae
Issue Date
2019-03
Citation
Inorganic Chemistry, 58(5), 3065-3072
Type
Article
Article Type
Article
Keywords
PRUSSIAN BLUE ANALOGIN-SALT ELECTROLYTECRYSTAL-STRUCTURECARBON ELECTRODESOPEN FRAMEWORKCYCLE LIFELONG-LIFEINTERCALATIONINSERTIONLITHIUM
ISSN
0020-1669
Abstract
Rhombohedral potassium-zinc hexacyanoferrate K 1.88 Zn 2.88 [Fe(CN) 6 ] 2 (H 2 O) 5 (KZnHCF) synthesized using a precipitation method is demonstrated as a high-voltage cathode material for potassium-ion batteries (PIBs), exhibiting an initial discharge capacity of 55.6 mAh g -1 with a discharge voltage of 3.9 V versus K/K + and a capacity retention of 95% after 100 cycles in a nonaqueous electrolyte. All K ions are extracted from the structure upon the initial charge process. However, only 1.61 out of 1.88 K ions per formula unit are inserted back into the structure upon discharge, and it becomes the reversible ion of the second cycle onward. Despite the large ionic size of K, the material exhibits a lattice-volume change (3%) during a cycle, which is exceptionally small among the cathode materials for PIBs. The distinct feature of the material seems to come from the unique porous framework structure built by ZnN 4 and FeC 6 polyhedra linked via the CN bond and a Zn/Fe atomic ratio of 3/2, resulting in high structural stability and cycle performance. © 2019 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/9677
DOI
10.1021/acs.inorgchem.8b03081
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
Files:
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Collection:
Department of Energy Science and EngineeringBattery Materials Discovery Laboratory1. Journal Articles


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