Facile Fabrication of Hierarchical Manganese-Cobalt Mixed Oxide Microspheres as High-Performance Anode Material for Lithium Storage. (20th December 2016)

• Record Type: Journal Article
• Authors: Ye, Jiajia; Zhao, Dianyun; Hao, Qin; Xu, Caixia
• Is Part Of: Electrochimica acta. Volume 222(2016)
• Page Start: 1402
• Page End: 1409
• Publication Date: 2016-12-20
• Subjects: manganese-cobalt oxide -- microspheres -- lithium-ion batteries -- anode -- dealloying; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.11.117
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: MnCoOx microspheres characterized by the second-order interconnected nanosheets with rich voids among the spheres are simply prepared through one step dealloying of Mn5 Co5 Al90 ternary alloy at room temperature. MnCoOx microspheres achieve superior capacities and long cycle life both at the current rates of 300 and 1000 mA g −1 as anode materials for lithium storage. Highlights: MnCoOx microspheres are prepared by one step dealloying of Mn5 Co5 Al90 alloy. MnCoOx possesses the hierarchical microsphere structure assembled by nanosheets. MnCoOx show much higher cycling stability and rate capability than pure Mn3 O4 . MnCoOx exhibits higher discharge capacity than Mn3 O4 at the rate of 1000 mA g −1 . Abstract: Nanostructured manganese-cobalt mixed oxide (MnCoOx ) is straightforwardly prepared via one-step dealloying of the MnCoAl ternary alloy in mild alkaline solution. The as-made MnCoOx has the micro-/nano- architecture with the first order interconnected microsphere buildings and rich voids accompanied with the second order interlaced nanosheet assemblies on the microsphere. Upon leaching out the Al atoms from the MnCoAl source alloy, the residual Mn and Co atoms go though the natural oxidation at the metal/electrolyte interface to generate the MnCoOx microspheres. Electrochemical tests suggest that the as-made MnCoOx anode has the exceptional reversible capacity and rate capability at the high current rate of 1500 mA g −1 . Especially, the MnCoOx microspheres achieve much higher capacities and longer cycle life both at the current rates of 300 and 1000 mA g −1 . The MnCoOx microspheres show the prospective applications as an advanced anode in LIBs with the advantages of unusual lithium storage performance and easy preparation.