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Li 2− x Fe 1− x Al x SiO 4 /C Nanocomposites Cathodes for Lithium‐Ion Batteries
Author(s) -
Gao Haiyan,
Hu Zhe,
Yang Jingang,
Chen Jun
Publication year - 2014
Publication title -
energy technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.91
H-Index - 44
eISSN - 2194-4296
pISSN - 2194-4288
DOI - 10.1002/ente.201300181
Subject(s) - electrochemistry , lithium (medication) , nanocomposite , materials science , cathode , redox , transition metal , ion , doping , metal , chemical engineering , inorganic chemistry , electrode , nanotechnology , chemistry , catalysis , metallurgy , organic chemistry , optoelectronics , medicine , engineering , endocrinology
Recently, Li 2 FeSiO 4 has been identified as one of the most attractive cathode materials for lithium‐ion batteries because it has the ability to exchange more than one Li + per redox‐active transition‐metal ion. However, this material behavior has been difficult to realize at room temperature due to the redox reaction of Fe 3+ /Fe 4+ . In this article, Li 2− x Fe 1− x Al x SiO 4 /C ( x =0, 0.01, 0.03, 0.05, 0.08, 0.12, and 1) nanocomposites were synthesized by using a facile sol–gel method and shown to exhibit much improved electrochemical performance at room temperature. It was found that after doping, two charge–discharge potential plateaus could be clearly obtained. In particular, the examined system, Li 1.97 Fe 0.97 Al 0.03 SiO 4 /C showed the best electrochemical performance with 209.3 mAh g −1 at 0.2 C , corresponding to a release of 1.26 Li + per molecule.