Suppression of voltage-decay in Li2MnO3 cathode via reconstruction of layered-spinel coexisting phases

Through a combined electrochemical-thermal treatment, Li2MnO3 can be converted into new layered-spinel phases that essentially suppress the voltage decay.

Nanostructure-Related Magnetic Properties of Various Mesoporous Cobalt Oxide and Cobalt Ferrite Spinel Phases

Nanostructure-related magnetic properties are investigated systematically for various mesoporous cobalt oxide (Co3O4) and cobalt ferrite (CoFe2O4) spinel phases. Synthesis of thematerials by nanocasting offers the opportunity to obtain materials which are different from each other with respect to both specific surface area and crystallite size. As a result, the respective contributions of two types of interfaces, namely, “solid–gas” and “solid–solid” interfaces, to the magnetic ordering can be distinguished. Structural characterization of the porous materials by X-ray diffraction, N2 physisorption, and electron microscopy as well as investigation of the magnetic behavior (field-dependent magnetization and temperaturedependentsusceptibility) are presented.

Constructing heterostructured Li–Fe–Ni–Mn–O cathodes for lithium-ion batteries: effective improvement of ultrafast lithium storage

A heterostructured Li–Fe–Ni–Mn–O cathode material with layered/spinel phases shows superior ultrafast lithium storage capability.