原位限域和化学耦合的VS_(2)/Ti_(3)C_(2)T_(x)MXene钠离子电池负极

In-situ Confinement Growth and Chemically Coupling VS_(2)/Ti_(3)C_(2)T_(x)MXene as Sodium-Ion Batteries Anode

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_(3)C_(2)T_(x)MXene上形成铆钉结构的复合材料(VS_(2)/Ti_(3)C_(2)T_(x)MXene)应用于钠离子电池。通过Ti_(3)C_(2)T_(x)MXene的原位限域作用抑制了VS_(2)的团聚生长。VS_(2)和Ti_(3)C_(2)T_(x)MXene之间形成稳定的化学耦合作用也提升了VS_(2)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2000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。

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 VS_(2)/Ti_(3)C_(2)T_(x)MXene sodium-ion battery anode was synthesized via a solvothermal strategy to form VS_(2) nanosheet in situ anchoring on Ti_(3)C_(2)T_(x)MXene structure.The agglomeration of VS_(2) during growth process was suppressed based on in-situ confinement growth mechanism by Ti_(3)C_(2)T_(x)MXene.In addition,the charge transfer kinetics of VS2 is also largely boosted by the stable chemical coupling between VS_(2) and Ti_(3)C_(2)T_(x)MXene.As a result,the VS_(2)/Ti_(3)C_(2)T_(x)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 2000 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.