Na_(3)V_(2)(PO_(4))_(3)/CN/rGO复合正极材料的构筑及储钠性能研究  

Construction of Na_(3)V_(2)(PO_(4))_(3)/CN/rGO Composite Cathode Material and Its Sodium Storage Performance

作　　者：汪仕杰 肖慧 任玉荣 黄小兵 王海燕[3] WANG Shijie;XIAO Hui;REN Yurong;HUANG Xiaobing;WANG Haiyan(Jiangsu Province Engineering Research Center of Intelligent Manufacturing Technology for the New Energy Vehicle Power Battery,Changzhou Key Laboratory of Intelligent Manufacturing and Advanced Technology for Power Battery,Changzhou Key Laboratory of the Vital Technology for Power Battery and Management System,School of Materials Science and Engineering,Changzhou University,Changzhou 213164,China;Hunan Province Cooperative Innovation Center for the Construction&Development of Dongting Lake Ecological Economic Zone,Hunan Provincial Key Laboratory of Water Treatment Functional Materials,Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology,College of Chemistry and Materials Engineering,Hunan University of Arts and Science,Changde 415000,China;Hunan Provincial Key Laboratory of Chemical Power Sources,College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China)

机构地区：[1]常州大学材料科学与工程学院,江苏省新能源汽车动力电池制造技术工程研究中心,常州市动力电池智能制造高技术重点实验室,常州市动力电池及管理系统关键技术重点实验室,常州213164 [2]湖南文理学院化学与材料工程学院,洞庭湖生态经济区建设与发展协同创新中心,水处理功能材料湖南省重点实验室,电镀废水回用技术湖南省工程研究中心,常德415000 [3]中南大学化学化工学院,化学电源湖南省重点实验室,长沙410083

出　　处：《材料导报》2021年第24期24006-24010,共5页Materials Reports

基　　金：国家自然科学基金(91961126);江苏高校优势学科建设工程资助项目;江苏省教育厅青蓝工程;江苏省研究生科研与实践创新计划项目(KYCX20_2539)。

摘　　要：Na_(3)V_(2)(PO_(4))_(3)具有理论容量高、钠离子超导体(NASICON)结构等优势,被认为是一种值得研究和大规模应用的新型钠离子电池正极材料。然而低的电导率导致其电化学性能在大电流充放电条件下不理想。本实验采用固相法制备了一种由氮掺杂碳与还原氧化石墨烯(rGO)共修饰的Na_(3)V_(2)(PO_(4))_(3)/CN/rGO(NVP/CN/rGO)复合正极材料,并借助材料表征手段、电化学分析技术等对不同含量rGO掺入的NVP/CN/rGO正极材料的微观形貌和电化学性能进行了系统研究。结果显示,NVP/CN/rGO-2复合材料颗粒分布均匀,并表现出较高的可逆容量和优越的循环稳定性。在0.2 C、10 C下可逆容量分别为116.9 mAh·g^(-1)和99.4 mAh·g^(-1),且在10 C下循环1500次后,容量保持率为97.2%。复合材料表现优异性能的主要原因是:rGO特殊的导电网络结构将孤立的NVP/CN连接起来,提升了颗粒之间的接触电导,使其导电性进一步提高,从而显著提升其电化学性能。Na_(3)V_(2)(PO_(4))_(3)is regarded as a viable and promising cathode material in sodium-ion batteries because of its high capacity and NASICON structure.However,the low conductivity leads to unsatisfactory electrochemical performance under high current charge and discharge conditions.In this work,Na_(3)V_(2)(PO_(4))_(3)/CN/rGO(NVP/CN/rGO)cathode material on the basis of nitrogen doped carbon and reduced graphene oxide(rGO)decorated are prepared via the solid phase method,and the influence of different contents of rGO on the microscopic morphology and electrochemical performance of the NVP/CN/rGO cathode material,are systematically studied by the aid of material characterization methods and electrochemical analysis techniques.The results reveal that NVP/CN/rGO-2 particles are very uniform,and they display an excellent electrochemical performance,which is confirmed by high discharge specific capacity(116.4 mAh·g^(-1)at 0.2 C)and long-term lifetime(97.2%capa-city retention after 1500 cycles).The main reason for the excellent performance of the composites is that the special conductive network structure of grapheme can connect the isolated NVP/CN particles and further improve its conductivity,thereby showing excellent storage sodium perfor-mance.

关 键 词：钠离子电池 正极材料 Na_(3)V_(2)(PO_(4))_(3) 还原氧化石墨烯 

分 类 号：TM911[电气工程—电力电子与电力传动]