摘要
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.
作者
陈召勇
李子哗
林锋
李涛
段军飞
曾光
CHEN Zhao-yong;LI Zi-hua;LIN Feng;LI Tao;DUAN Jun-fei;ZENG Guang(School of Materials Science and Engineering,Changsha University of Science&Technology,Changsha 410114,China)
出处
《现代化工》
CAS
CSCD
北大核心
2023年第10期143-147,共5页
Modern Chemical Industry
基金
国家自然科学基金面上项目(51874048)
国家自然科学基金青年项目(21905278)。
关键词
多孔碳
锑/碳复合材料
钠离子电池
负极
porous carbon
antimony/carbon composite
sodium-ion battery
anode
