1 research outputs found
Synthesis of Li-Rich NMC: A Comprehensive Study
Li-rich
NMC are considered nowadays as one of the most promising
candidates for high energy density cathodes. One significant challenge
is nested in adjusting their synthesis conditions to reach optimum
electrochemical performance, but no consensus has been reached yet
on the ideal synthesis protocol. Herein, we revisited the elaboration
of Li-rich NMC electrodes by focusing on the science involved through
each synthesis steps using carbonate Ni<sub>0.1625</sub>Mn<sub>0.675</sub>Co<sub>0.1625</sub>CO<sub>3</sub> precursor coprecipitation combined
with solid state synthesis. We demonstrated the effect of precursor’s
concentration on the kinetics of the precipitation reaction and provided
clues to obtain spherically agglomerated NMC carbonates of different
sizes. Moreover, we highlighted the strong impact of the Li<sub>2</sub>CO<sub>3</sub>/NMC carbonate ratio on the morphology and particles
size of Li-rich NMC and subsequently on their electrochemical performance.
Ratio of 1.35 was found to reproducibly give the best performance
with namely a first discharge capacity of 269 mAh g<sup>–1</sup> and capacity retention of 89.6% after 100 cycles. We hope that our
results, which reveal how particle size, morphology, and phase composition
affect the material’s electrochemical performance, will help
in reconciling literature data while providing valuable fundamental
information for up scaling approaches