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Development of P3-K0.69CrO2 as an ultra-high-performance cathode material for K-ion batteries

Title
Development of P3-K0.69CrO2 as an ultra-high-performance cathode material for K-ion batteries
Author
황장연
Keywords
LAYERED NACRO2; SODIUM; INTERCALATION; LITHIUM; ANODES
Issue Date
2018-10
Publisher
ROYAL SOC CHEMISTRY
Citation
ENERGY & ENVIRONMENTAL SCIENCE, v. 11, no. 10, page. 2821-2827
Abstract
Potassium-ion batteries (KIBs) are emerging as a promising energy storage technology because of their low cost and high energy density. However, the large size of K+ ions hinders the reversible electrochemical potassium (de)insertion in the host structure, limiting the selection of suitable electrode materials for KIBs. Herein, we designed and exploited a new layered oxide, P3-type K0.69CrO2 (hereafter denoted as P3-K0.69CrO2), as a high-performance cathode for KIBs for the first time. The proposed P3-K0.69CrO2 cathode was successfully synthesized via an electrochemical ion-exchange route and exhibited the best cycling performance for a KIB cathode material to date. A combination of electrochemical profiles, ex situ X-ray diffraction, and first-principles calculations was used to understand the overall potassium storage mechanism of P3-K0.69CrO2. Based on a reversible phase transition, P3-K0.69CrO2 delivers a high discharge capacity of 100 mA h g(-1) and exhibits extremely high cycling stability with approximate to 65% retention over 1000 cycles at a 1C rate. Moreover, the K-ion hopping into the P3-K0.69CrO2 structure was extremely rapid, resulting in great power capability of up to a 10C rate with a capacity retention of approximate to 65% (vs. the capacity at 0.1C).
URI
https://pubs.rsc.org/en/content/articlelanding/2018/EE/C8EE01365A#!divAbstracthttp://repository.hanyang.ac.kr/handle/20.500.11754/120455
ISSN
1754-5692; 1754-5706
DOI
10.1039/c8ee01365a
Appears in Collections:
CENTER FOR CREATIVE CONVERGENCE EDUCATION[S](창의융합교육원) > ETC
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