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Hierarchical Surface Atomic Structure of a Manganese‐Based Spinel Cathode for Lithium‐Ion Batteries
Author(s) -
Lee Sanghan,
Yoon Gabin,
Jeong Minseul,
Lee MinJoon,
Kang Kisuk,
Cho Jaephil
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201408853
Subject(s) - spinel , lithium (medication) , materials science , tetragonal crystal system , manganese , electrochemistry , cathode , coating , dissolution , chemical engineering , oxide , phase (matter) , inorganic chemistry , nanotechnology , metallurgy , chemistry , electrode , medicine , organic chemistry , endocrinology , engineering
The increasing use of lithium‐ion batteries (LIBs) in high‐power applications requires improvement of their high‐temperature electrochemical performance, including their cyclability and rate capability. Spinel lithium manganese oxide (LiMn 2 O 4 ) is a promising cathode material because of its high stability and abundance. However, it exhibits poor cycling performance at high temperatures owing to Mn dissolution. Herein we show that when stoichiometric lithium manganese oxide is coated with highly doped spinels, the resulting epitaxial coating has a hierarchical atomic structure consisting of cubic‐spinel, tetragonal‐spinel, and layered structures, and no interfacial phase is formed. In a practical application of the coating to doped spinel, the material retained 90 % of its capacity after 800 cycles at 60 °C. Thus, the formation of an epitaxial coating with a hierarchical atomic structure could enhance the electrochemical performance of LIB cathode materials while preventing large losses in capacity.