ZrO2- and Li2ZrO3-stabilized spinel and layered electrodes for lithium batteries |
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| Institution: | 1. Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Advanced Energy Materials and Technologies, University of Science and Technology Beijing, Beijing 100083, China;2. School of Materials Science and Engineering, Beihang University, Beijing 100191, China |
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| Abstract: | Strategies for countering the solubility of LiMn2O4 (spinel) electrodes at 50 °C and for suppressing the reactivity of layered LiMO2 (M=Co, Ni, Mn, Li) electrodes at high potentials are discussed. Surface treatment of LiMn2O4 with colloidal zirconia (ZrO2) dramatically improves the cycling stability of the spinel electrode at 50 °C in Li/LiMn2O4 cells. ZrO2-coated LiMn0.5Ni0.5O2 electrodes provide a superior capacity and cycling stability to uncoated electrodes when charged to a high potential (4.6 V vs Li0). The use of Li2ZrO3, which is structurally more compatible with spinel and layered electrodes than ZrO2 and which can act as a Li+-ion conductor, has been evaluated in composite 0.03Li2ZrO3 · 0.97LiMn0.5Ni0.5O2 electrodes; glassy LixZrO2 + x/2 (0<x?2) products can be produced from colloidal ZrO2 for surface coatings. |
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