氮掺杂无氟Ti_(3)C_(2)T_(x)/SnO_(2)复合材料的储锂特性研究  

Lithium storage performances of nitrogen-doped fluorine-free Ti_(3)C_(2)T_(x)/SnO_(2)composite

作　　者：李莹蕊 李明明 刘庆雷[1] LI Yingrui;LI Mingming;LIU Qinglei(State Key Laboratory of Metal Matrix Composites,School of Material Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学材料科学与工程学院金属基复合材料国家重点实验室,上海200240

出　　处：《电源技术》2021年第6期698-702,共5页Chinese Journal of Power Sources

基　　金：国家自然科学基金项目(51672175,51772187,51271116);上海市科委基础研究项目(16520710900,18JC1410500,17ZR1441400,17520710600);国际科技重点合作项目(2017YFE0113000)。

摘　　要：负极材料对锂离子电池的电化学性能至关重要。使用NaOH刻蚀得到无氟Ti_(3)C_(2)T_(x)(T=OH,O)材料并通过氮掺杂、水热原位生长SnO_(2)得到一种N-Ti_(3)C_(2)T_(x)/SnO_(2)复合材料用于锂离子电池的负极。SnO_(2)纳米粒子分散均一地锚固在高导电的N掺杂MXene骨架上,可以加速电子传输并缓冲SnO_(2)的团聚与体积膨胀,此外,SnO_(2)作为间隔物还可以减弱MXene纳米片的重新堆叠。电化学测试结果表明,在0.1,0.2,0.5,1,2和5 A/g电流密度下的质量比容量分别为485,331,243,171,132和97 mAh/g。0.5 A/g下经过200次循环后放电比容量仍能保持90.1%,体现了此新型负极材料在锂离子电池中的潜在应用前景。Anode materials have a significant influence on the electrochemical performance of lithium-ion batteries.Fluorine-free Ti_(3)C_(2)T_(x)(T=OH,O)material was obtained through using NaOH etching.Through nitrogen doping,hydrothermal in-situ growth of SnO_(2),a N-Ti_(3)C_(2)T_(x)/SnO_(2) composite material for the anode of lithium-ion batteries was obtained.SnO_(2) nanoparticles were uniformly anchored on the highly conductive N-doped MXene framework,which accelerated electron transport and suppressed the agglomeration and volume expansion of SnO_(2).In addition,SnO_(2) as a spacer could also reduce the re-stacking of MXene nanosheets.The electrochemical test results show that the mass specific capacities at discharge rates of 0.1,0.2,0.5,1,2 and 5 A/g are 485,331,243,171,132 and 97 mAh/g,respectively.The capacity can remain about 90.1%after 200 cycles at a rate of 0.5 A/g,which shows the potential application of this new type of anode electrode material in lithium-ion batteries.

关 键 词：锂离子电池 N掺杂 SnO_(2) MXene 电极材料 

分 类 号：TM912[电气工程—电力电子与电力传动]