Morphologyecontrolled synthesis of the porous Co3O4 with rugby-shaped and spherical structures and theirs electrochemical properties as negative materials for Li-ion batteries

摘要

Morphology-controlled porous Co3O4 electrode materials with rugby.shaped and spherical structures are synthesized through a facile solvothermal method followed by annealing treatment, and the regulation of the morphologies is accomplished by simply adjusting the concentration of the reactants. According to the N-2 adsorptionedesorption isotherm curves, the samples have a relatively rich mesoporous structure, and the Barrette-Joyner-Halenda (BJH) pore size distributions are found at 2.5 and 32.8 nm for the Co3O4 sample with rugby-shaped structure (denoted as R-Co3O4), and 2.2 nm for the spherical Co3O4 sample (denoted as S-Co3O4). Simultaneously, the BrunauereEmmetteTeller (BET) surface areas of the R-Co3O4 and S-Co3O4 samples are 31.3 and 26.7 m(2) g(-1), respectively. Electrochemical properties of the samples as anode materials for Li-ion batteries show that the R-Co3O4 electrode material has higher specific capacity, better rate performance and superior cycle stability than the S-Co3O4 for the higher specific surface area, richer pore size distribution, nanosized particles, lower charge transfer resistance and better reaction reversibility. (C) 2020 Elsevier B.V. All rights reserved.