高稳定性NaTi_2(PO_4)_3/C复合材料的制备与表征  

Preparation and characterization of NaTi_2(PO_4)_3/C composite material with high stability

作　　者：贺诗阳 刘宇 张书明[2] 张娜[2] 贺健[2] 

机构地区：[1]上海电力学院环境与化学工程学院,上海200090 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《电源技术》2017年第11期1561-1564,共4页Chinese Journal of Power Sources

基　　金：上海科学技术委员会(14DZ1201500);中国科学院(Y33YZ5150G和Y59YQ2120G)对本工作的支持

摘　　要：通过固相法合成了具有典型NASICON结构的NaTi_2(PO_4)_3/C复合材料,碳质量分数为5%。以该材料为负极,以制备的λ-MnO_2为正极,在1 mol/L的Na_2SO_4水溶液中测试了NaTi_2(PO_4)_3/C复合材料的电化学性能。结果表明:在0.1C下该材料的比容量达到82 mAh/g;在1.5C下初始比容量达到54 mAh/g,500次循环后为48 mAh/g,容量保持率为88.9%。NaTi_2(PO_4)_3/C材料具有优良的循环性能和倍率特性,且材料的制备工艺简单,绿色环保,作为水系钠离子电池的负极具有较好的应用前景。In this work, NASICON type NaTi_2(PO_4)_3/C composite with a carbon content of 5% was synthesized by a conventional solid-state method. The electrochemical properties of the cell using the NaTi_2(PO_4)_3/C composite as the anode and the as-prepared λ-MnO_2 as the cathode were tested in 1 mol/L Na2SO4 aqueous electrolyte. The NaTi2-(PO4)3/C electrode exhibits a specific capacity of 82 mAh/g at a current density of 0.1 C. An initial specific capacity of54 mAh/g is obtained at a current density of 1.5 C and remains 48 mAh/g after 500 cycles, meaning the capacity retention of 88.9%. The as-proposed NaTi_2(PO_4)_3/C material shows an excellent cycling stability and rate capability,as well as a simple synthesis route and environmentally friendly performance. These merits make it a promising anode for aqueous sodium ion batteries.

关 键 词：储能 水系钠离子电池 NaTi2(PO4)3 l-MnO2 固相法 

分 类 号：TM912.9[电气工程—电力电子与电力传动]