NDLI: A facile route to synthesize multiporous MnCo2O4 and CoMn2O4 spinel quasi-hollow spheres with improved lithium storage properties

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Xiaowei Qian, Yitai Li, Jingfa Xiong, Shenglin
Copyright Year	2013
Abstract	A facile and general way for the synthesis of porous and hollow complex oxides is highly desirable owing to their significant applications for energy storage and other fields. In this contribution, uniform Mn0.33Co0.67CO3 and Co0.33Mn0.67CO3 microspheres are firstly fabricated solvothermally just by tuning the molar ratio of Mn and Co. Subsequently, the growth of multiporous MnCo2O4 and CoMn2O4 quasi-hollow microspheres by topotactic chemical transformation from the corresponding precursors are realized through a non-equilibrium heat treatment process. Topotactic conversion further demonstrated that the much larger CoMn2O4 pores than those of MnCo2O4 are possibly due to the longer transfer distance of ions. When evaluated as anode materials for LIBs (lithium ion batteries), after 25 cycles at a current density of 200 mA g−1, the resultant MnCo2O4 and CoMn2O4 quasi-hollow microspheres possessed reversible capacities of 755 and 706 mA h g−1, respectively. In particular, the MnCo2O4 samples could deliver a reversible capacity as high as 610 mA h g−1 even at a higher current density of 400 mA g−1 with excellent electrochemical stability after 100 cycles of testing, indicating its potential application in LIBs. We believe that such good performance results from the appropriate pore size and quasi-hollow nature of MnCo2O4 microspheres, which can effectively buffer the large volume variation of anodes based on the conversion reaction during Li+ insertion/extraction. The present strategy is simple but very effective, and due to its versatility, it can be extended to other binary, even ternary complex metal oxides with high-performance in LIBs.
Starting Page	2045
Ending Page	2054
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	5
Issue Number	5
Journal	Nanoscale
DOI	10.1039/c2nr33576j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Anode Electrochemistry Ion Concentration Li Electric current
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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