| Autor: |
Mohanty, Debasish, Mazumder, Baishakhi, Devaraj, Arun, Sefat, Athena S., Huq, Ashfia, David, Lamuel A., Payzant, E. Andrew, Li, J., IIIWood, David L., Daniel, Claus |
| Zdroj: |
Nano Energy; Jun2017, Vol. 36, p76-84, 9p |
| Abstrakt: |
Development of stable high-voltage (HV), high capacity (HC) cathode oxides is indispensable to enhancing the performance of current high-energy-density (HED) lithium-ion batteries. Overstoichiometric, layered Li- and Mn-rich (LMR) composite oxides are promising materials for HV-HC cathodes for HED batteries; however, their practical use is limited. By probing the crystal structure, magnetic structure, and microstructure of the Li 1.2 Mn 0.55 Ni 0.15 Co 0.1 O 2 LMR oxide, we demonstrate that the oxide loses its pristine chemistry, structure, and composition during the first charge-discharge cycle and that it proceeds through a series of progressive events that introduce impediments on the ion mobility pathways. We discovered i) the presence of tetrahedral Mn 3+ , interlayer cation intermixing, interface of layered-spinel, and structurally rearranged domains, cation segregation at an HV charged state, and ii) the loss of Li ions, inhomogeneous distribution of Li/Ni, and structurally transformed domains after the first discharge. The results will advance our fundamental understanding of the obstacles related to ion migration pathways in HV-HC cathode systems and will enable us to formulate design rules for use of such materials in high-energy-density electrochemical-energy-storage devices. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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