具有(113)优势晶面的钠离子电池正极材料Na3V2(PO4)3/C  

Na_3V_2(PO_4)_3/C cathode materials with preferred (113) orientation for sodium ion batteries

作　　者：倪乔 吴川[1] 白莹[1] 刘元昌[1] 陈光海[1] 吴锋[1] 

机构地区：[1]北京理工大学材料学院,环境科学与工程北京市重点实验室,北京100081

出　　处：《储能科学与技术》2016年第3期341-348,共8页Energy Storage Science and Technology

基　　金：国家973计划(2015CB251100);教育部新世纪优秀人才支持计划(NCET-12-0047)

摘　　要：通过简单的溶胶-凝胶辅助静电纺丝法得到(113)晶面优势导向的Na_3V_2(PO_4)_3/C钠离子电池正极材料,并通过对比最佳纺丝条件下分别用聚乙烯吡咯烷酮(PVP)和聚氧化乙烯(PEO)作为晶面导向剂制备的两种Na_3V_2(PO_4)_3电极材料的电化学性能,证明静电纺丝有利于实现Na_3V_2(PO_4)_3(113)晶面择优取向。在相同的电流密度(0.1 C)下,NVP-PVP和NVP-PEO的首周放电比容量分别为112.5 m A·h/g和96.3 m A·h/g,电池循环50周后,NVP-PVP仍然有98.1 m A·h/g的可逆容量保持,NVP-PEO仅仅只剩下34 m A·h/g的可逆容量保持,而即使循环100周后,NVP-PVP的可逆容量仍然在88.2 m A·h/g。结果表明,PVP静电纺丝有利于构建特定的纳米纤维结构和均一的导电碳网络骨架,进而提升主体材料Na_3V_2(PO_4)_3的电化学性能。In this paper, the Na3V2（PO4）3/C cathode materials with（113） preferred orientation for sodium ion batteries were obtained by a simple sol-gel adjuvant electrospinning method. The electrochemical performance of two different morphology Na3V2（PO4）3/C materials were compared, which were synthetized through different polymers Polyvinylpyrrolidone（PVP） and Polyethylene oxide（PEO） under the optimal conditions, it further demonstrates that the significant role of electrospinning method to prepare the（113） preferred Na3V2（PO4）3/C materials. At the same current density of 0.1C, NVP-PVP exhibited an initial specific capacity of 112.5 m A·h/g, and still stabling at 98.1 m A·h/g after 50 cycles, however, NVP-PEO can only keep at 34 m A·h/g. Even after 100 cycles, NVP-PVP can show a reversible capacity of 88.2 m A·h/g. The results show that PVP has the advantage at fabricating the distinct nanofiber structure and the uniform conductive carbon framework, which will promote the electrochemical performance of Na3V2（PO4）3.

关 键 词：钠离子电池 Na3V2(PO4)3/C 静电纺丝 择优取向 

分 类 号：TM912[电气工程—电力电子与电力传动]