锑材料自身导电性较差且在充放电过程中存在较大的体积膨胀,导致循环不稳定而限制了其在电极材料中的应用。采用氯化钠作模板,通过羧甲基纤维素钠(CMCNa)与金属锑离子发生螯合反应形成锑和碳复合材料的前驱体,并进一步煅烧而成功制备了纳米锑金属被多孔碳包覆的锑/多孔碳复合材料。通过X射线衍射(XRD)、扫描电子显微镜(SEM)对复合材料进行表征分析,证明锑碳成功复合且具有明显的多孔形貌。对组装的钠离子电池进行循环伏安(CV)测试、电化学阻抗(EIS)分析及电化学充放电测试。结果表明,在50 mA/g的电流密度下,电池放电容量达到371 mAh/g;经过100圈循环后,电池仍然可以稳定保持350 mAh/g的放电比容量。

Antimony material has a poor electrical conductivity and appears a large volume expansion in the charge and discharge process,leading to the instability in circulation and other problems,which limits its application in the electrode material.Taking sodium chloride as a template,the precursor of antimony-carbon composites is formed through the chelation reaction between carboxymethylcellulose sodium (CMCNa) and metal antimony ions,then further calcined to successfully prepare antimony/porous carbon composite material,in which nano antimony metal is coated by porous carbon.The composite material is characterized by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM).It is proved that antimony and carbon are successfully composited,and the composite material has an obvious porous morphology.Cyclic voltammetry test,electrochemical impedance analysis and electrochemical charge-discharge test are carried out on the assembled sodium ion battery based on the prepared antimony/carbon composite.The result shows that the discharge capacity of the battery can deliver a high specific capacity of 371 mAh·g^-1 under a current density of 50 mA·g^-1.After 100 cycles,the battery can still maintain a discharge capacity of 350 mAh·g^-1 stably.

陈召勇(1974-),男,博士,教授,博士生导师,研究方向为先进电池与材料,chenzhaoyongcioc@126.com