1 research outputs found
Modified Coprecipitation Synthesis of Mesostructure-Controlled Li-Rich Layered Oxides for Minimizing Voltage Degradation
Modified
carbonate coprecipitation synthesis without addition of chelating
agent is introduced to obtain mesostructure-controlled Li-rich layered
oxides. The designed mesostructure for target material Li<sub>1.2</sub>Ni<sub>0.2</sub>Mn<sub>0.6</sub>O<sub>2</sub> has uniformly dispersed
spherical secondary particles with size around 3 μm. These micrometer-sized
particles consist of self-assembled crystallites with size of ∼150
nm. This unique design not only decreases the surface area compared
with the sample with dispersive particles, but also increases overall
structural mechanical stability compared with the sample with larger
dense secondary particles as observed by transmission X-ray microscope.
As a result, the voltage decay and capacity loss during long-term
cycling have been minimized to a large extent. Our findings clearly
demonstrate that mesostructure design of Li-rich layered oxides play
a key role in optimizing this class of cathode materials. Surprisingly,
the voltage fading issue can be partially mitigated by such an approach