AUTHOR=Gao Yumei , Hui Yuchong , Yin Hang 

TITLE=Enhanced Electrochemical Property of Li1.2−xNaxMn0.54Ni0.13Co0.13O2 Cathode Material for the New Optoelectronic Devices

JOURNAL=Frontiers in Physics

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2021.690661

DOI=10.3389/fphy.2021.690661

ISSN=2296-424X

ABSTRACT=<p>The Li-rich Mn-based oxide Li<sub>1.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> has been extensively studied as a cathode material of the battery module for new optoelectronic devices. To improve and enhance the electrochemical performance, sodium doping is one of the effective approaches. According to the density functional theory of first-principles, the band gap, partial density of states, lithiation formation energy, electron density difference, and potential energy of electrons for Li<sub>1.2−<italic>x</italic></sub>Na<sub><italic>x</italic></sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> were simulated with Materials Studio, Nanodcal, and Matlab. When the sodium doping amount <italic>x</italic> = 0.10 mol, simulations show that Li<sub>1.2−<italic>x</italic></sub>Na<sub><italic>x</italic></sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> has a better conductivity. The potential maps of Li<sub>1.2−<italic>x</italic></sub>Na<sub><italic>x</italic></sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>O<sub>2</sub> obtained in Matlab demonstrate that the potential barrier is lower and the rate capability is enhanced after sodium doping. Results of analyses and calculations agree with the experimental result of Chaofan Yang’s group. This theoretical method could be a great avenue for the investigation of the battery application of new optoelectronic devices. Also, our findings could give some theoretical guidance for the subsequent electrochemical performance study on doping in the field of lithium-ion batteries.</p>