FeSe_(2)/Ti_(3)C_(2)Tx复合材料的制备及其钠存储性能  

Preparation of FeSe_(2)/Ti_(3)C_(2)T_(x)Composites with Sodium Storage Properties

作　　者：张文雪[1] 郭俊虎 张永康 白敏[1] 何成 ZHANG Wenxue;GUO Junhu;ZHANG Yongkang;BAI Min;HE Cheng(School of Materials Science and Engineering,Changʹan University,Xiʹan 710061,China;State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]长安大学材料科学与工程学院,西安710061 [2]西安交通大学材料科学与工程学院,材料力学国家重点实验室,西安710049

出　　处：《硅酸盐学报》2023年第7期1716-1723,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51471124,U1766216);中央基金(CHD300102311405,CHD300102312405)。

摘　　要：硒化物常被应用于钠离子电池负极材料,具有更高可逆容量和合适的工作电位,然而,循环过程中的体积变化较大,电导率较低,限制了其实际应用。通过简单的水热反应制备了FeSe_(2)/Ti_(3)C_(2)T_(x)复合材料作为钠离子电池负极材料。Fe^(2+)首先与乙二胺四乙酸配位并形成螯合物,经过水热反应,Ti_(3)C_(2)T_(x)和Fe^(2+)螯合物之间产生静电作用,合成了FeSe_(2)/Ti_(3)C_(2)T_(x)复合材料。FeSe_(2)/Ti_(3)C_(2)T_(x)呈开放式的“花瓣”结构,Ti_(3)C_(2)T_(x)为材料提供了强导电网络并且缓解了一定的体积膨胀。电化学测试表明:FeSe_(2)/Ti_(3)C_(2)T_(x)电极在0.5 A/g下经过150次循环后容量达到455 m A·h/g,相同电流密度下,FeSe_(2)电极循环100圈后的容量仅为335 m A·h/g,并且在随后的循环中容量迅速衰减,以上结果表明合理的结构设计使得FeSe_(2)/Ti_(3)C_(2)T_(x)电极具有优异的电化学储钠性能和循环稳定性。Selenides have a higher reversible capacity and a suitable working potential.However,their large volume change during cycling and low conductivity restrict their practical applications.In this paper,FeSe_(2)/Ti_(3)C_(2)T_(x)composites were synthesized as anode materials for sodium-ion batteries by a simple hydrothermal method.Fe^(2+)were firstly coordinated with ethylene diamine tetraacetie acid to form chelates,and then FeSe_(2)/Ti_(3)C_(2)T_(x)composites were synthesized via the electrostatic interaction between Ti_(3)C_(2)T_(x)and Fe^(2+)chelates after the hydrothermal reaction.FeSe_(2)/Ti_(3)C_(2)T_(x)has an open‘flower petal’structure,and Ti_(3)C_(2)T_(x)in the composite provides an intense conductive network for the material and relieves volume expansion.According to the results of the electrochemical test,Ti_(3)C_(2)T_(x)electrode has a capacity of 455 mA·h/g after 150 cycles at 0.5 A/g,while the capacity of FeSe_(2)electrode at the same current density is only 335 mA·h/g after 100 cycles,and the capacity decays rapidly in the subsequent cycles.It is indicated that FeSe_(2)/Ti_(3)C_(2)T_(x)electrode has superior electrochemical sodium storage performance and cycling stability.

关 键 词：碳化钛 水热反应 钠离子电池 硒化物 

分 类 号：TM911[电气工程—电力电子与电力传动]