Nanoscale Coating of LiMO<sub>2</sub> (M = Ni, Co,
Mn) Nanobelts with Li<sup>+</sup>‑Conductive Li<sub>2</sub>TiO<sub>3</sub>: Toward Better Rate Capabilities for Li-Ion Batteries
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Abstract
By using a novel coating approach based on the reaction
between
MC<sub>2</sub>O<sub>4</sub>·<i>x</i>H<sub>2</sub>O
and Ti(OC<sub>4</sub>H<sub>9</sub>)<sub>4</sub>, a series of nanoscale
Li<sub>2</sub>TiO<sub>3</sub>-coated LiMO<sub>2</sub> nanobelts with
varied Ni, Co, and Mn contents was prepared for the first time. The
complete, thin Li<sub>2</sub>TiO<sub>3</sub> coating layer strongly
adheres to the host material and has a 3D diffusion path for Li<sup>+</sup> ions. It is doped with Ni<sup>2+</sup> and Co<sup>3+</sup> ions in addition to Ti<sup>4+</sup> in LiMO<sub>2</sub>, both of
which were found to favor Li<sup>+</sup>-ion transfer at the interface.
As a result, the coated nanobelts show improved rate, cycling, and
thermal capabilities when used as the cathode for Li-ion battery
