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A First‐Cycle Coulombic Efficiency Higher than 100 % Observed for a Li 2 MO 3 (M=Mo or Ru) Electrode
Author(s) -
Jang Jihyun,
Kim Youngjin,
Chae Oh B.,
Yoon Taeho,
Kim SangMo,
Kim Hyunseung,
Park Hosang,
Ryu Ji Heon,
Oh Seung M.
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201404510
Subject(s) - faraday efficiency , electrolyte , oxide , ion , metal , ternary operation , electrode , decomposition , lithium (medication) , analytical chemistry (journal) , materials science , inorganic chemistry , chemistry , metallurgy , organic chemistry , medicine , endocrinology , computer science , programming language
The lithiation/de‐lithiation behavior of a ternary oxide (Li 2 MO 3 , where M=Mo or Ru) is examined. In the first lithiation, the metal oxide (MO 2 ) component in Li 2 MO 3 is lithiated by a conversion reaction to generate nano‐sized metal (M) particles and two equivalents of Li 2 O. As a result, one idling Li 2 O equivalent is generated from Li 2 MO 3 . In the de‐lithiation period, three equivalents of Li 2 O react with M to generate MO 3 . The first‐cycle Coulombic efficiency is theoretically 150 % since the initial Li 2 MO 3 takes four Li + ions and four electrons per formula unit, whereas the M component is oxidized to MO 3 by releasing six Li + ions and six electrons. In practice, the first‐cycle Coulombic efficiency is less than 150 % owing to an irreversible charge consumption for electrolyte decomposition. The as‐generated MO 3 is lithiated/de‐lithiated from the second cycle with excellent cycle performance and rate capability.