Lithium
Titanate Epitaxial Coating on Spinel Lithium Manganese Oxide Surface
for Improving the Performance of Lithium Storage Capability
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Abstract
Spinel
lithium titanate (Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>, LTO)
is applied as an epitaxial coating layer on LiMn<sub>2</sub>O<sub>4</sub> hollow microspheres (LMO) through solvothermal-assisted processing.
The epitaxial interface between LTO and LMO can be clearly observed
by high resolution transmission electron microscopy (HR-TEM) and high
angle annular dark field scanning transmission electron microscopy
(HAADF-STEM) with atomic resolution images. The epitaxial coating
cathode (EC-LMO@LTO) exhibits an excellent cyclability, thermal and
rate capability for LIBs cathode due to the complete, thin LTO coating
layer with strong adhesion to the host material. In addition, the
small structure mismatch and high Li<sup>+</sup>-ion mobility of LTO
can be beneficial to forming an efficient tunnel for Li<sup>+</sup>-ion transfer at the interface. It is suggested that EC-LMO@LTO can
be recognized as a promising cathode material in electric vehicles
(EVs) and plug-in hybrid electric vehicles (HEVs)