title: Bulk-Type All-Solid-State Lithium-Ion Batteries: Remarkable Performances of a Carbon Nanofiber-Supported MgH2Composite Electrode.
abstract: Magnesium hydride, MgH2, a recently developed compound for lithium-ion batteries, is considered to be a promising conversion-type negative electrode material due to its high theoretical lithium storage capacity of over 2000 mA h g-1, suitable working potential, and relatively small volume expansion. Nevertheless, it suffers from unsatisfactory cyclability, poor reversibility, and slow kinetics in conventional nonaqueous electrolyte systems, which greatly limit the practical application of MgH2. In this work, a vapor-grown carbon nanofiber was used to enhance the electrical conductivity of MgH2using LiBH4as the solid-state electrolyte. It shows that a reversible capacity of over 1200 mA h g-1with an average voltage of 0.5 V (vs Li/Li+) can be obtained after 50 cycles at a current density of 1000 mA g-1. In addition, the capacity of MgH2retains over 1100 mA h g-1at a high current density of 8000 mA g-1, which indicates the possibility of using MgH2as a negative electrode material for high power and high capacity lithium-ion batteries in future practical applications. Moreover, the widely studied sulfide-based solid electrolyte was also used to assemble battery cells with MgH2electrode in the same system, and the electrochemical performance was as good as that using LiBH4electrolyte.
authors.affiliation: Institute for Advanced Materials Research, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Liang
authors.initials: L
authors.lastname: Zeng
authors.affiliation: Institute for Advanced Materials Research, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan.|Graduate School of Integrated Arts and Sciences, Hiroshima University , 1-7-1 Kagamiyama, Higashi-Hiroshima 739-8521, Japan.
authors.forename: Takayuki
authors.identifier: http://orcid.org/0000-0003-3425-8758
authors.initials: T
authors.lastname: Ichikawa
authors.affiliation: Graduate School of Advanced Sciences of Matter, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Kawahito
authors.affiliation: Institute for Advanced Materials Research, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Miyaoka
authors.affiliation: Institute for Advanced Materials Research, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan.|Graduate School of Advanced Sciences of Matter, Hiroshima University , 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan.
authors.forename: Yoshitsugu
authors.initials: Y
authors.lastname: Kojima
keywords: all-solid-state; conversion-type electrode; lithium-ion batteries; metal hydrides; negative electrode