{010} oriented Li1.2Mn0.54Co0.13Ni0.13O2@C nanoplate with high initial columbic efficiency

Abstract

Lithium rich Mn-based oxide with high capacity and low cost has been viewed as a promising cathode for lithium ion batteries with high energy density. However, there still exists the drawback of the low initial columbic efficiency that caused by the irreversible electrochemical activation of Li2MnO3. Here, {010}-oriented Li1.2Mn0.54Co0.13Ni0.13O2@C nanoplate is prepared by using active carbon to absorb the ethylene glycol solution containing Li+, Co2+, Mn2+ and Ni2+ after the calcination at 850 °C. Ethylene glycol contributes to the formation of the exposed {010} planes, the nanoplate morphology and oxygen vacancies (OVs). The as-prepared material presents a reversible capacity of 276 mA h g−1 and high initial columbic efficiency of 92% at 25 mA g−1, superior rate capability and excellent cycling stability. The high initial columbic efficiency is mainly due to OVs with the function to decrease the irreversible charge capacity related with oxygen release over 4.5 V. And the rate capability is improved by the exposed {010} planes for the enhanced Li+ diffusion and the coating carbon for the excellent electron conductivity. Our work provides a facile method for exposing {010} active planes in lithium rich Mn-based oxide with high initial columbic efficiency.