title: A morphology, porosity and surface conductive layer optimized MnCo2O4 microsphere for compatible superior Li(+) ion/air rechargeable battery electrode materials.
abstract: Uniform surface conductive layers with porous morphology-conserved MnCo2O4 microspheres are successfully synthesized, and their electrochemical performances are thoroughly investigated. It is found that the microwave-assisted hydrothermally grown MnCo2O4 using citric acid as the carbon source shows a maximum Li(+) ion lithiation/delithiation capacity of 501 mA h g(-1) at 500 mA g(-1) with stable capacity retention. Besides, the given microsphere compounds are effectively activated as air cathode catalysts in Li-O2 batteries with reduced charge overpotentials and improved cycling performance. We believe that such an affordable enhanced performance results from the appropriate quasi-hollow nature of MnCo2O4 microspheres, which can effectively mitigate the large volume change of electrodes during Li(+) migration and/or enhance the surface transport of the LiOx species in Li-air batteries. Thus, the rationally designed porous media for the improved Li(+) electrochemical reaction highlight the importance of the 3D macropores, the high specific area and uniformly overcoated conductive layer for the promising Li(+) redox reaction platforms.
authors.affiliation: Advanced Battery Materials Research Group, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Daejeon, Republic of Korea. shochoi@krict.re.kr.
authors.forename: Young Jun
authors.initials: YJ
authors.lastname: Yun
authors.affiliation: Advanced Battery Materials Research Group, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Daejeon, Republic of Korea. shochoi@krict.re.kr.
authors.forename: Jin Kyu
authors.initials: JK
authors.lastname: Kim
authors.affiliation: Advanced Battery Materials Research Group, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Daejeon, Republic of Korea. shochoi@krict.re.kr.
authors.forename: Ji Young
authors.initials: JY
authors.lastname: Ju
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea. imwonbin@jnu.ac.kr.
authors.forename: Sanjith
authors.initials: S
authors.lastname: Unithrattil
authors.affiliation: Advanced Battery Materials Research Group, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Daejeon, Republic of Korea. shochoi@krict.re.kr.
authors.forename: Sun Sook
authors.initials: SS
authors.lastname: Lee
authors.affiliation: Advanced Battery Materials Research Group, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Daejeon, Republic of Korea. shochoi@krict.re.kr.
authors.forename: Yongku
authors.initials: Y
authors.lastname: Kang
authors.affiliation: Advanced Battery Materials Research Group, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Daejeon, Republic of Korea. shochoi@krict.re.kr.
authors.forename: Ha-Kyun
authors.initials: HK
authors.lastname: Jung
authors.affiliation: Division of Materials Science and Engineering Hanyang University, Seongdong-gu, Seoul, Republic of Korea. jsparklime@hanyang.ac.kr.
authors.forename: Jin-Seong
authors.initials: JS
authors.lastname: Park
authors.affiliation: School of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, 300 Yongbong-dong, Buk-gu, Gwangju 500-757, Republic of Korea. imwonbin@jnu.ac.kr.
authors.forename: Won Bin
authors.initials: WB
authors.lastname: Im
authors.affiliation: Advanced Battery Materials Research Group, Korea Research Institute of Chemical Technology, 141 Gajeongro, Yuseong, Daejeon, Republic of Korea. shochoi@krict.re.kr.
authors.forename: Sungho
authors.initials: S
authors.lastname: Choi