Associate Prof. Hongxun Yang and his collaborator made important progress on multi-metal oxides.doc
Title: Constructing unique heterogeneous cobalt-manganese oxide porous microspheres as anode for long-cycle and high-rate lithium ion batteries
Recently, porous (Co, Mn)(Co, Mn)2O4-based microspheres (CM-11-Ms) and core-shell microspheres (CM-11-CSMs) were firstly synthesized via controlling pyrolysis of CoMn-precursor microspheres at different temperatures in nitrogen (Scheme 1). During the pyrolysis process of CoMn-precursor, the carbon derived-from hexamethylenetetramine and polyethylene glycol transforms parts of (Co, Mn)(Co, Mn)2O4 into MnO and Co3O4.As an anode for lithium ion batteries, CM-11-Ms exhibits a specific capacity of 745 mAh g-1 after 650 cycles at 1 A g-1. While for CM-11-CSMs, it can deliver an enhanced lithium storage capacity of 2175.8 mAh g-1 after 1000 cycles at 1 A g-1 without no obvious capacity decay. The improved properties could be attributed to the unique core-shell structure to accommodate the volume expansion during cycling, the high-rate lithiation-induced reactivation, and the synergy effects between (Co, Mn)(Co, Mn)2O4, Co3O4, and MnO. This work has been published in Journal of Materials Chemistry A, 2019, 7, 6149–6160
