Synthesis of layered Li-Ni-Mn-O compounds by hydrothermal soft chemical process and their charge-discharge properties

Abstract

Layered manganese oxide H-birnessite was exfoliated into a nano-sheet sol solution by reaction with (CH₃)₄NOH solution. A Ni(NO₃)₂ solution was added into the nano-sheet sol solution, then the nano-sheet restack with accommodation of Ni(OH)₂ into the interlayer space, causing formation of a MnO₂-Ni(OH)₂ co-precipitate. After hydrothermal treatment of the co-precipitate, a MnO₂-Ni(OH)₂ sandwich layered compound was obtained. A hexagonal layered Li-Ni-Mn-O phase was prepared by hydrothermal treatment of the sandwich compound in a LiOH solution, and its electrochemical properties was investigated.