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Scalable Integration of Li 5 FeO 4 towards Robust, High‐Performance Lithium‐Ion Hybrid Capacitors
Author(s) -
Park MinSik,
Lim YoungGeun,
Hwang Soo Min,
Kim Jung Ho,
Kim JeomSoo,
Dou Shi Xue,
Cho Jaephil,
Kim YoungJun
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402397
Subject(s) - lithium (medication) , electrochemistry , capacitor , materials science , electrode , nanotechnology , chemistry , electrical engineering , voltage , medicine , engineering , endocrinology
Lithium‐ion hybrid capacitors have attracted great interest due to their high specific energy relative to conventional electrical double‐layer capacitors. Nevertheless, the safety issue still remains a drawback for lithium‐ion capacitors in practical operational environments because of the use of metallic lithium. Herein, single‐phase Li 5 FeO 4 with an antifluorite structure that acts as an alternative lithium source (instead of metallic lithium) is employed and its potential use for lithium‐ion capacitors is verified. Abundant Li + amounts can be extracted from Li 5 FeO 4 incorporated in the positive electrode and efficiently doped into the negative electrode during the first electrochemical charging. After the first Li + extraction, Li + does not return to the Li 5 FeO 4 host structure and is steadily involved in the electrochemical reactions of the negative electrode during subsequent cycling. Various electrochemical and structural analyses support its superior characteristics for use as a promising lithium source. This versatile approach can yield a sufficient Li + ‐doping efficiency of >90 % and improved safety as a result of the removal of metallic lithium from the cell.