Nanostructured high‐energy xLi2MnO3·(1‐x)LiNi0.5Mn0.5O2 (0.3 ≤ x ≤ 0.6) cathode materials |
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| Authors: | Xiaofeng Zhang Miklos Lengyel Richard L Axelbaum |
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| Affiliation: | Dept. of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, MO |
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| Abstract: | Nanostructured lithium‐manganese‐rich nickel‐manganese‐oxide xLi2MnO3·(1‐x)LiNi0.5Mn0.5O2 (0.3 ≤ x ≤ 0.6) composite materials were synthesized via spray pyrolysis using mixed nitrate precursors. All the materials showed a composite structure consisting of Li2MnO3 (C2/m) and LiNi0.5Mn0.5O2  components, and the amount of Li2MnO3‐phase appeared to increase with x, as observed from XRD analysis. These composite materials showed a high‐discharge capacity of about 250 mAhg?1. In the range of x considered, the layered 0.5Li2MnO3·0.5LiNi0.5Mn0.5O2 materials displayed the highest capacity and superior cycle stability. Nonetheless, voltage suppression from a layered‐spinel phase transition was observed for all the composites produced. This voltage suppression was dependent of the amount of Li2MnO3 phase present in the composite structure. © 2013 American Institute of Chemical Engineers AIChE J 60: 443–450, 2014 |
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| Keywords: | Li‐Mn‐rich cathode xLi2MnO3· (1‐x)LiNi0 5Mn0 5O2 spray pyrolysis high‐energy Li‐ion battery |
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