Na_(3)V_(2)(PO_(4))_(3)/C复合正极材料的合成与表征研究  

A study on the synthesis and characterization of Na_(3)V_(2)(PO_(4))_(3)/C composite cathode materials

作　　者：张合钰 李长刚 何文[1] 张旭东[1] 李长久[3] 徐小龙[1] ZHANG He-yu;LI Chang-gang;HE Wen;ZHANG Xu-dong;LI Chang-jiu;XU Xiao-long(School of Material Science and Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan 250353,China;Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China;State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikou 570228,China)

机构地区：[1]齐鲁工业大学(山东省科学院)材料科学与工程学院,山东济南250353 [2]中国地质大学材料与化学学院,湖北武汉430074 [3]海南大学南海海洋资源利用国家重点实验室,海南海口570228

出　　处：《齐鲁工业大学学报》2022年第6期28-33,共6页Journal of Qilu University of Technology

基　　金：国家自然科学基金(51672139);海南大学南海海洋资源利用国家重点实验室开放课题资助。

摘　　要：以Na_(3)V_(2)(PO_(4))_(3)(NVP)为基础材料,以海藻酸钠为碳源,采用化学合成方法,对NVP材料进行碳复合、非金属离子掺杂,合成了具有优异电化学性能的NVP/C复合正极材料。探究了材料组成、合成温度、微观结构等对NVP复合材料电化学性能的影响。研究结果表明,海藻酸钠形成的碳骨架结构拥有良好的机械强度,将其在高电流密度下进行充放电时,碳骨架能够保持稳定不坍塌,提高材料的循环性能和倍率性能;当加入50 mL的海藻酸钠水溶液并经800℃烧时,NVP/C复合材料的电化学性能最佳,在0.5 C的低倍率下其首次放电比容量为110.3 mAh·g^(-1),当倍率增加到50 C时,其放电比容量为78.1 mAh·g^(-1),当循环2000圈之后其放电比容量保持率高达80.4%,其库伦效率基本保持在100%,远优于已报道的研究结果。In this paper,Na_(3)V_(2)(PO_(4))_(3)(NVP)is used as the basic material,sodium alginate is used as the carbon source,and the NVP material is composited with carbon and doped with non-metal ions using a chemical synthesis method to synthesize NVP/C with excellent electrochemical performance.The influence of material composition,synthesis temperature,microstructure on the electrochemical performance of NVP composite material is studied.The results show that the carbon skeleton structure formed by sodium alginate has good mechanical strength.When it is charged and discharged at high current density,the carbon skeleton can remain stable and not collapse,whichimproves the cycle performance and rate performance of the material.The electrochemical performance of the NVP/Ccomposite material is the best when adding 50 mL sodium alginate aqueous solution and burning at 800℃.The firstdischarge specific capacity is 110.3 mAh·g^(-1)at low rate of 0.5 C.The discharge specific capacity is 78.1 mAh·g^(-1)when the rate is increased to 50 C,and after 2000 cycles,its discharge specific capacity retention rate is as high as 80.4%,and its coulombic efficiency is basically maintained at 100%,which is far superior to the reported results.

关 键 词：钠离子电池 磷酸钒钠 复合正极材料 掺杂改性 

分 类 号：TK512.3[动力工程及工程热物理—热能工程]