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A Versatile Coating Strategy to Highly Improve the Electrochemical Properties of Layered Oxide LiMO<sub>2</sub> (M = Ni<sub>0.5</sub>Mn<sub>0.5</sub> and Ni<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>)
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work provides a convenient, effective and highly versatile coating
strategy for the layered oxide LiMO<sub>2</sub> (M = Ni<sub>0.5</sub>Mn<sub>0.5</sub> and Ni<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>). Here, layered oxide LiMO<sub>2</sub> (M = Ni<sub>0.5</sub>Mn<sub>0.5</sub> and Ni<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>) has
been successfully coated with ion conductor of Li<sub>2</sub>SiO<sub>3</sub> by in situ hydrolysis of tetraethyl orthosilicate (TEOS)
followed by the lithiation process. The discharge capacity, cycle
stability, rate capability, and some other electrochemical performances
of layered cathode materials LiMO<sub>2</sub> can be highly enhanced
through surface-modification by coating appropriate content of Li<sub>2</sub>SiO<sub>3</sub>. Particularly, the 3 mol % Li<sub>2</sub>SiO<sub>3</sub> coated LiNi<sub>1/3</sub>Mn<sub>1/3</sub>Co<sub>1/3</sub>O<sub>2</sub> exhibits approximately a discharge capacity of 111
mAh/g after 300 cycles at the current density of 800 mA/g (5 C). Potentiostatic
intermittent titration technique (PITT) test was carried out to investigate
the mechanism of the improvement in the electrochemical properties.
The diffusion coefficient of Li<sup>+</sup>-ion (D<sub>Li</sub>) of
Li<sub>2</sub>SiO<sub>3</sub> coated layered oxide materials has been
greatly increased. We believe our methodology provides a convenient,
effective and highly versatile coating strategy, which can be expected
to open the way to ameliorate the electrochemical properties of electrode
materials for lithium ion batteries
