静电纺丝制备NaVPO_4F/C纳米纤维作为钠离子电池正极材料
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- 英文论文题名：Electrospun NaVPO_4F/C nanofibers as cathode material for Na-ion batteries
- 论文作者：金婷 ; 刘永畅 ; 李阳 ; 曹康哲 ; 焦丽芳
- 英文论文作者：Ting Jin ; Yongchang Liu ; Yang Li ; Kangzhe Cao ; Lifang Jiao ; Key Laboratory of Advanced Energy Materials Chemistry(MOE) ; College of Chemistry ; Collaborative Innovation Center of Chemical Science and Engineering ; Nankai University
- 年：2016
- 作者机构：南开大学先进能源材料化学教育部重点实验室天津化学化工协同创新中心化学学院;
- 论文关键词：钠离子电池 ; 静电纺丝 ; NaVPO_4F ; 正极材料
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TQ343;TM912
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：322k
- 原文格式：D
- 会议级别：全国
摘要
钠离子电池资源丰富,成本低廉,近年来备受关注。在众多正极材料中,NaVPO_4F由于理论比容量高(143mAhg~(-1))~([1]),电压平台高(3.3V)~([2]),结构稳定成为研究热点。但其导电性较差且容易团聚,致其容量低、循环稳定性较差。针对这一问题,本文通过静电纺丝技术制备了NaVPO_4F/C复合纳米纤维用以提高其性能。XRD(Fig.1a)表明在800℃煅烧4 h可得到晶型最好的NaVPO_4F,SEM(Fig.1b)显示该材料为光滑均匀的纳米纤维,TEM(Fig.1c)证明NaVPO_4F纳米颗粒镶嵌于多孔碳纤维中。该NaVPO_4F/C在2 C(1C=143mA g~(-1))电流密度下,可逆容量为92.1 mA h g~(-1),循环200周后容量保持率为96.7%,展现出了良好的循环稳定性(Fig.1d)。究其原因,一维NaVPO_4F/C纳米纤维交织形成了三维导电网络,不仅提高了NaVPO_4F的导电性,而且有效抑制了NaVPO_4F粒子在充放电过程中的团聚。
NaVPO_4F has received a great deal of attention due to its high theoretical capacity(143 mA h g~(-1)),high voltage platform(3.3V) and structural stability.Novel NaVPO_4F/C nanofibers have been successfully prepared via a feasible electrospinning method as Na-ion batteries cathode materials.Based on the morphological and microstructural characterization,it can be seen that the nanofibers are smooth and continuous with NaVPO_4F nanoparticles embedded in porous carbon.For Na-storage,NaVPO_4F/C exhibited excellent electrochemical performance with a reversible capacity of 92.1 mA h g~(-1) at 2C(1C=143mA g~(-1)) and a high capacity retention of96.7%after 200 cycles.One-dimensional NaVPO_4F/C nanofibers that interlink into three-dimensional conductive network could not only improve the conductivity of NaVPO_4F,but also effectively restrain the aggregation of NaVPO_4F particles during charge/discharge process,leading to the high performance.
NaVPO_4F has received a great deal of attention due to its high theoretical capacity(143 mA h g~(-1)),high voltage platform(3.3V) and structural stability.Novel NaVPO_4F/C nanofibers have been successfully prepared via a feasible electrospinning method as Na-ion batteries cathode materials.Based on the morphological and microstructural characterization,it can be seen that the nanofibers are smooth and continuous with NaVPO_4F nanoparticles embedded in porous carbon.For Na-storage,NaVPO_4F/C exhibited excellent electrochemical performance with a reversible capacity of 92.1 mA h g~(-1) at 2C(1C=143mA g~(-1)) and a high capacity retention of96.7%after 200 cycles.One-dimensional NaVPO_4F/C nanofibers that interlink into three-dimensional conductive network could not only improve the conductivity of NaVPO_4F,but also effectively restrain the aggregation of NaVPO_4F particles during charge/discharge process,leading to the high performance.
引文
[1]Barker J,Saidi M Y,Swoyer J L.Electrochem.Solid-State Lett.,2003,6:A1-A4
[2]Palomares V,Serras P,Villaluenga I,et al.Energy Environ.Sci.,2012,5(3):5884-5901.
[2]Palomares V,Serras P,Villaluenga I,et al.Energy Environ.Sci.,2012,5(3):5884-5901.