Cai, Hong, Chen, Ruiyong, Bahri, Mounib, Hawkins, Cara, Sonni, Manel, Daniels, Luke, Lim, Jungwoo, Evans, Jae, Zanella, Marco, Jones, Leanne, Manning, Troy, Veal, Tim, Hardwick, Laurence, Dyer, Matthew, Browning, Nigel, Claridge, John and Rosseinsky, Matthew (2022) Fluorine-Rich Oxyfluoride Spinel-Like Li1.25Ni0.625Mn1.125O3F Utilizing Redox-Active Ni and Mn for High Capacity and Improved Cyclability. [Data Collection]
Description
Extending the accessible capacity and cyclability is of central interest for cathode materials for Li-ion batteries. Here, we report the successful synthesis of a new spinel-like Li1.25Ni0.625Mn1.125O3F (Fd3 ̅m) oxyfluoride with significant cation disorder characterised by combined refinement of X-ray and neutron diffraction data. Li1.25Ni0.625Mn1.125O3F utilizes redox reactions of both Ni and Mn, accessing capacities of 225 (i.e., 1.46 Li+ capacity) and 285 mAh g-1 (i.e., 1.85 Li+ capacity) at 25 °C and 40 °C, respectively, through intercalation of additional Li+ into the lattice. Moreover, compared to lithium transition metal disordered rocksalt or spinel-like oxyfluorides previously reported, Li1.25Ni0.625Mn1.125O3F shows significantly improved cycling stability. Ex situ compositional, structural and spectroscopic analysis of samples at different states of charge/discharge confirm a single-phase intercalation reaction and high structural integrity over cycling.
| Keywords: | Li ion battery, Cathode, Spinel, Electrochemistry, Solid-state chemistry |
|---|---|
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences > Chemistry |
| Depositing User: | Luke Daniels |
| Date Deposited: | 21 Mar 2023 16:28 |
| Last Modified: | 22 Mar 2023 10:34 |
| DOI: | 10.17638/datacat.liverpool.ac.uk/1759 |
| URI: | https://datacat.liverpool.ac.uk/id/eprint/1759 |
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