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通过溶剂热法制备了一种纳米尺寸的VS2薄片原位钉扎在Ti_3C_2Tx MXene上形成铆钉结构的复合材料(VS2/Ti_3C_2Tx MXene)应用于钠离子电池。通过Ti_3C_2Tx MXene的原位限域作用抑制了VS2的团聚生长。VS2和Ti_3C_2Tx MXene之间形成稳定的化学耦合作用也提升了VS2的电荷传输动力。结果表明：该复合材料在10 A/g的电流密度下具有340 mA·h/g的高倍率性能，以及5 A/g的电流密度下稳定循环2 000圈的电化学性能。该复合设计为发展兼具高能量密度和高功率密度钠离子电池负极材料提供了新的选择。
Abstract：Sodium ion batteries (SIBs) have a great potential in electrochemical energy storage.However,the development of SIBs anodes with high specific capacity and cycle stability is still a challenge.In this paper,a VS2/Ti_3C_2Tx MXene sodium-ion battery anode was synthesized via a solvothermal strategy to form VS2 nanosheet in situ anchoring on Ti_3C_2Tx MXene structure.The agglomeration of VS2 during growth process was suppressed based on in-situ confinement growth mechanism by Ti_3C_2Tx MXene.In addition,the charge transfer kinetics of VS2 is also largely boosted by the stable chemical coupling between VS2 and Ti_3C_2Tx MXene.As a result,the VS2/Ti_3C_2Tx MXene composite exhibits a high specific capacity of 340 mA?h/g at a high current density of 10 A/g,as well as a stable long-term electrochemical performance after 2 000 cycles at a current density of 5 A/g.This design of composite provides an effective approach for the development of anode materials for sodium-ion batteries with a high energy density and a high power density.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20230099
中图分类号:TM912
引用信息:
[1]李恩智,王明珊,陈淋,等.原位限域和化学耦合的VS_2/Ti_3C_2T_x MXene钠离子电池负极[J].硅酸盐学报,2023,51(10):2603-2616.DOI:10.14062/j.issn.0454-5648.20230099.
基金信息:
国家自然科学基金面上项目(52072322); 四川省科技计划项目重点研发项目(2022YFG0294)
2023-07-28
2023-07-28
2023-07-28