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Journal articles
Structural evolution at the oxidative and reductive limits in the first electrochemical cycle of Li1.2Ni0.13Mn0.54Co0.13O2
Abstract : High-energy-density lithium-rich materials are of significant interest for advanced lithium-ion batteries, provided that several roadblocks, such as voltage fade and poor energy efficiency are removed. However, this remains challenging as their functioning mechanisms during first cycle are not fully understood. Here we enlarge the cycling potential window for Li1.2Ni0.13Mn0.54Co0.13O2 electrode, identifying novel structural evolution mechanism involving a structurally-densified single-phase A’ formed under harsh oxidizing conditions throughout the crystallites and not only at the surface, in contrast to previous beliefs. We also recover a majority of first-cycle capacity loss by applying a constant-voltage step on discharge. Using highly reducing conditions we obtain additional capacity via a new low-potential P” phase, which is involved into triggering oxygen redox on charge. Altogether, these results provide deeper insights into the structural-composition evolution of Li1.2Ni0.13Mn0.54Co0.13O2 and will help to find measures to cure voltage fade and improve energy efficiency in this class of material.
Keywords :
battery
Cited literature [52 references]
https://hal-univ-pau.archives-ouvertes.fr/hal-02515164
Contributor : Sylvie Blanc Connect in order to contact the contributor
Submitted on : Monday, October 5, 2020 - 10:14:54 AM
Last modification on : Monday, January 10, 2022 - 10:16:08 AM
Long-term archiving on: : Wednesday, January 6, 2021 - 6:19:32 PM
Contributor : Sylvie Blanc Connect in order to contact the contributor
Submitted on : Monday, October 5, 2020 - 10:14:54 AM
Last modification on : Monday, January 10, 2022 - 10:16:08 AM
Long-term archiving on: : Wednesday, January 6, 2021 - 6:19:32 PM
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