In this work, we report the electrochemical properties of 0.5Li2MnO3·0.25LiNi0.5Co0.2Mn0.3O2·0.25LiNi0.5Mn1.5O4 and 0.333Li2MnO3·0.333LiNi0.5Co0.2Mn0.3O2·0.333LiNi0.5Mn1.5O4 layered-layered-spinel (L∗LS) cathode materials prepared by a high-energy ball-milling process. Our L∗LS cathode materials can deliver a large and stable capacity of ∼200 mAhg-1 at high voltages up to 4.9 V, and do not show the anomalous capacity increase upon cycling observed in previously reported three-component cathode materials synthesized with different routes. Furthermore, we have performed synchrotron-based in situ X-ray diffraction measurements and found that there are no significant structural distortions during charge/discharge runs. Lastly, we carry out (opt-type) van der Waals-corrected density functional theory (DFT) calculations to explain the enhanced cycle characteristics and reduced phase transformations in our ball-milled L∗LS cathode materials. Our simple synthesis method brings a new perspective on the use of the high-power L∗LS cathodes in practical devices.
- high-energy ball-milling process
- layered-layered-spinel cathode
- lithium-ion battery
- three-component electrode
ASJC Scopus subject areas
- Materials Science(all)