Enhanced capacity and lower mean charge voltage of Li-rich cathodes for lithium ion batteries resulting from low-temperature electrochemical activation. Issue 12 (20th January 2017)

• Record Type: Journal Article
• Authors: Erickson, Evan M.; Schipper, Florian; Tian, Ruiyuan; Shin, Ji-Yong; Erk, Christoph; Chesneau, Frederick Francois; Lampert, Jordan K.; Markovsky, Boris; Aurbach, Doron
• Is Part Of: RSC advances. Volume 7:Issue 12(2017)
• Page Start: 7116
• Page End: 7121
• Publication Date: 2017-01-20
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c6ra25275c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : Activation of Li-rich cathode materials at low-temperatures (0 or 15 °C) results in ∼10% higher discharge capacities than activation at 30 °C. Abstract : High capacity and high energy cathodes prepared from Li-rich 0.35Li2 MnO3 ·0.65Li[Mn0.45 Ni0.35 Co0.20 ]O2 materials must be activated in Li-ion cells prior to normal cycling, in order to achieve their high discharge capacity of >250 mA h g −1 . Activation is performed by charging the electrodes to potentials of 4.7–4.8 V vs. Li/Li + . This communication reports on the discovery that electrochemical activation of these cathode materials at low temperatures (0–15 °C) increases their discharge capacity, lowers average charge voltage, and diminishes voltage hysteresis. Work with the above mentioned material is reported as a representative example.