Synthesis of hierarchical 1D NiO assisted by microwave as anode material for lithium-ion batteries

Abstract Fast solvothermal reaction assisted with microwave is performed to obtain hierarchical 1 D NiO with porous structure. First, the 1D NiC2O4·2H2O precursor template grows within only 30 min without any other organic chelating agent. Then, a facile heat-treatment is carried out to get the final NiO through gas removal. High surface area of 208.8 m2 g−1 is obtained due to the porous structure and small particle size of NiO. Thus, high initial charge/discharge capacity of 1020/1427 mAh g−1 is obtained at 100 mA g−1. Even increasing the current density to 5.0 A g−1, high charge/discharge capacity of 574/611 mAh g−1 can be obtained. Such good rate capability is attributed to the special hierarchical 1D structure which offers fast transfer of electrons and Li ions. Such facile strategy is considered as one of the most promising candidates to get anode material with remarkable electrochemical performances for application in lithium ion batteries.