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A High Voltage Olivine Cathode for Application in Lithium‐Ion Batteries
Author(s) -
Di Lecce Daniele,
Brescia Rosaria,
Scarpellini Alice,
Prato Mirko,
Hassoun Jusef
Publication year - 2016
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.201501330
Subject(s) - electrochemistry , olivine , cathode , materials science , ion , lithium (medication) , redox , polarization (electrochemistry) , chemical engineering , electrode , inorganic chemistry , mineralogy , chemistry , metallurgy , medicine , organic chemistry , endocrinology , engineering
A new olivine composition (i.e., LiFe 0.25 Mn 0.5 Co 0.25 PO 4 ) is proposed as electrode material with increased energy density for application in lithium‐ion batteries. The new formulation increases the working voltage and induces different electrochemical behavior with respect to bare olivine materials based on Fe. The study provides deep insight into the features of the Fe 3+ /Fe 2+ , Mn 3+ /Mn 2+ , and Co 3+ /Co 2+ redox couples within the olivine lattice in terms of electrochemical activity, Li + transport properties, and Li‐cell behavior. The electrochemical characterization clearly reveals the voltage signatures corresponding to the various metals; however, the Mn 3+ /Mn 2+ process has higher intrinsic polarization with respect to Fe 3+ /Fe 2+ and Co 3+ /Co 2+ . This issue is efficiently mitigated by carbon coating the material, resulting in enhanced electrochemical performances.