TY - JOUR
T1 - Structured spinel oxide positive electrodes of magnesium rechargeable batteries
T2 - High rate performance and high cyclability by interconnected bimodal pores and vanadium oxide coating
AU - Ishii, Kanji
AU - Doi, Shunsuke
AU - Ise, Ryuta
AU - Mandai, Toshihiko
AU - Oaki, Yuya
AU - Yagi, Shunsuke
AU - Imai, Hiroaki
N1 - Funding Information:
This study was supported by Advanced Low-Carbon Technology Specially Promoted Research for Innovative Next-Generation Batteries Program (ALCA-SPRING) of the Japan Science and Technology Agency; and Grant-in-Aid for the University of Tokyo Excellent Young Researcher.We thank Prof. Kiyoshi Kanamura (Tokyo Metropolitan University) for his kind support on the MIP measurements.
Funding Information:
This study was supported by Advanced Low-Carbon Technology Specially Promoted Research for Innovative Next-Generation Batteries Program (ALCA-SPRING) of the Japan Science and Technology Agency ; and Grant-in-Aid for the University of Tokyo Excellent Young Researcher .
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/3/5
Y1 - 2020/3/5
N2 - A structured spinel oxide as a positive-electrode active material for magnesium rechargeable batteries was produced using a propylene-oxide-driven sol–gel method and subsequent vanadium oxide coating. Porous frameworks consisting of MgMn2O4 nanoparticles having diameters of ∼10 nm exhibited a large specific surface area of ∼150 m2 g−1 and interconnected bimodal pores distributed in the micrometer (1–10 μm) and nanometer (10–100 nm) regions. Hierarchical conduction paths constructed by mixing the porous frameworks with carbon nanoparticles reduced the overpotential for the insertion and extraction of magnesium ions and increased the redox capacity in an ionic-liquid electrolyte system. Moreover, the surface coating of vanadium oxide on the spinel oxide nanoparticles enhanced the extraction of magnesium ions and suppressed the decomposition of the electrolyte. The electrochemical properties, such as the capacities, rate capabilities, and cyclabilities, of the positive electrodes were largely improved by the structured spinel oxide frameworks.
AB - A structured spinel oxide as a positive-electrode active material for magnesium rechargeable batteries was produced using a propylene-oxide-driven sol–gel method and subsequent vanadium oxide coating. Porous frameworks consisting of MgMn2O4 nanoparticles having diameters of ∼10 nm exhibited a large specific surface area of ∼150 m2 g−1 and interconnected bimodal pores distributed in the micrometer (1–10 μm) and nanometer (10–100 nm) regions. Hierarchical conduction paths constructed by mixing the porous frameworks with carbon nanoparticles reduced the overpotential for the insertion and extraction of magnesium ions and increased the redox capacity in an ionic-liquid electrolyte system. Moreover, the surface coating of vanadium oxide on the spinel oxide nanoparticles enhanced the extraction of magnesium ions and suppressed the decomposition of the electrolyte. The electrochemical properties, such as the capacities, rate capabilities, and cyclabilities, of the positive electrodes were largely improved by the structured spinel oxide frameworks.
KW - Coating
KW - Mg battery
KW - Morphology control
KW - Polymerized complex method
KW - Positive electrode
UR - http://www.scopus.com/inward/record.url?scp=85073945255&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073945255&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2019.152556
DO - 10.1016/j.jallcom.2019.152556
M3 - Article
AN - SCOPUS:85073945255
VL - 816
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
M1 - 152556
ER -