MnCo2O4 Anchored on Magneli Phase Titanium Oxide As a Non-Carbon Cathode for Li-O2 Batteries

Wednesday, 4 October 2017
Prince George's Exhibit Hall D/E (Gaylord National Resort and Convention Center)
R. Yang, X. Cao, Z. Sun (Soochow University), and F. Li (Beijing University of Technology)
Development of highly effective and environmentally friendly battery technology is crucial to the energy storage system and electronic vehicle.[1,2] Recently, the aprotic lithium-oxygen (Li-O2) battery has attracted much attention due to its high specific energy density of 3500 Wh kg-1 (based on the mass of Li2O2) and a favorable potential of 3.0 V, which are defined by the chemistry of the reversible reaction Li + O2 ↔Li2O2.[3,4] The high specific energy density of Li-O2 battery renders it a promising candidate for the electrical vehicle with extended-range driving. One of the challenges in Li-O2battery is to find a catalyst that can improve the sluggish electrochemical kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) during the discharge and charge process, respectively.[5]

Herein, we employ Magneli phase Ti4O7 as a support and construct a hybrid with MnCo2O4 (MCO) nanoparticles being anchored on the surface of Ti4O7 for the first time. This hybrid is employed as a non-carbon cathode material for Li-O2 batteries. The synergistic interaction between Ti4O7 support and MCO nanoparticles further promotes the catalytic activity and stability of the hybrid. Benefiting form these advantages, the as-synthesized Ti4O7-MCO hybrid exhibits excellent catalytic activity to decrease the voltage gap between discharge and charge. The Ti4O7-MCO presents excellent discharge performance when compared with other carbon-free cathode materials. Moreover, due to the excellent chemical durability of Ti4O7 in organic electrolyte and the interaction between Ti4O7and MCO, the hybird is very stable during the battery cycling without agglomeration and detachment.

The Discharge/charge profile, rate capability and cycling performance of Ti4O7-MCO are shown in Figure 1.



Figure 1.  (a) Discharge/charge profile of Ti4O7-MCO cathode under different current densities; (b) First discharge/charge profile of Ti4O7-MCO, Ti4O7, C and C-MCO with a limited capacity of 500 mAh g-1; (c) Cycling performance of Ti4O7 cathode; (d) Cycling performance of Ti4O7-MCO cathode.



This work is supported by National Natural Science Foundation of China (51572181), the National Key Research and Development Program of China (2016YFB0100200),Natural Science Foundation of Jiangsu Province, China (BK20151226).


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[5] Z.-L. Wang, D. Xu, J.-J. Xu, X.-B. Zhang, Chem. Soc. Rev. 43(2014)7746.