CoMoO4水热法制备及其在锂/钠离子电池中的应用

碳基负极材料比容量低，无法满足高能量密度电池的需求.为了进一步寻找高容量长循环寿命的电池负极材料，采用水热反应法制备了自支撑CoMoO₄负极，通过X射线衍射（XRD）和扫描电子显微镜（SEM）对材料的结构、形貌进行表征，利用循环伏安法和恒电流充/放电等技术对比研究了材料在锂/钠离子电池中的电化学性能.结果表明,CoMoO₄负极在锂离子电池中的首次可逆比容量为1 403.6 mAh/g，首次库伦效率为146.5%，在100 mA/g电流密度下经50次循环后仍然高达793.6 mAh/g；而CoMoO₄负极在钠离子电池中首次可逆比容量仅为314.2 mAh/g，但经50次循环后容量保持率仍有76.4 %.该自支撑负极无需导电剂和粘结剂，电极材料与泡沫镍结合力强，具有优异的循环稳定性.

Synthesis of CoMoO_4 and Its Application in Sodium/Lithium Ion Battery

The specific capacity of carbon-based anode material is low and can't meet the demand of battery with high energy density.To search for the anode material of battery with high capacity and long cycle life,the CoMoO₄ electrode was prepared through hydrothermal method.The structure and morphology of as-prepared material were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The electrochemical performances were investigated using cyclic voltammetry and galvanostatic charge/discharge measurement.The results showed that as it was applied to anode forlithium-ion batteries (LIBs),the initial reversible capacity was 1 403.6 mAh/g and the initial coulombic efficiency was up to 146.5%,and the specific reversible capacity retained up to 793.6 mAh/g even after 50 cycles at a current density of 100 mA/g.Furthermore,as it was applied into the anode material of sodium ion battery,the initial specific reversible capacity was only 314.2 mAh/g.However,the capacity retention was up to 76.4% after 50 cycles.There was no conductive and binder for the self-standing anode,and there was strong binding force between electrode material and nickel foam.Meanwhile,the excellent cycling stability was attributed to the small electrochemical transfer impedance.