摘要
SnS_(2)因理论储锂容量高,被认为是锂离子电池颇具应用潜力的负极材料之一,但其循环稳定性和倍率性能差。通过原位限域溶剂热法制备了SnS_(2) NPs@MXene,即SnS_(2)纳米颗粒/MXene复合材料,其中SnS_(2)纳米颗粒均匀地嵌在MXene层间,呈三明治结构。SnS_(2) NPs夹在MXene层间有利于抑制MXene的堆垛,同时缓解SnS_(2) NPs的体积应变;当用作锂离子电池负极时,SnS_(2) NPs@MXene复合电极表现出高可逆容量、强倍率性能和大电流下的长期循环稳定性:在0.1 A·g^(-1)的电流密度下循环200圈后,可逆容量为931 mAh·g^(-1);在5 A·g^(-1)的电流密度下,可逆容量高达566.5 mAh·g^(-1);在2 A·g^(-1)的电流密度下循环2000圈后,可逆容量保持在646 mAh·g^(-1)。具有重要意义的是,合成SnS_(2)纳米颗粒/MXene复合材料的方法同样适用于其他二维层状金属硫化物纳米粒子/MXene复合材料,也适用于二维层状金属硫化物纳米粒子/二维材料的合成。
SnS_(2) is considered as one of the most potential anode materials due to its high theoretical lithium storage capacity,but with poor cycle stability and rate performance.SnS_(2) nanoparticles/MXene composite(SnS_(2) NPs@MXene)was prepared by an in-situ confinement solvothermal method,in which SnS_(2) nanoparticles are uniformly embedded in the MXene layers in a sandwich structure.SnS_(2) NPs sandwiched between MXene can inhibit the stacking of MXene and relieve the volume strain of SnS_(2) NPs.As an anode of lithium-ion batteries,SnS_(2) NPs@MXene composite electrode has high reversible capacity,excellent rate performance and long-term cycling stability under high current density.The reversible capacity is 931 mAh·g^(-1)after 200 cycles at a current density of 0.1 A·g^(-1).The reversible capacity is as high as 566.5 mAh·g^(-1)at a current density of 5 A·g^(-1).The reversible capacity remains at 646 mAh·g^(-1)at 2 A·g^(-1)after 2000 cycles.It is of great significance that the synthesis method of SnS_(2) nanoparticles/MXene composite is also applicable to other two-dimensional layered metal sulfide nanoparticles/MXene composite,as well as two-dimensional layered metal sulfide nanoparticles/two-dimensional materials.
作者
何勋
谭正洁
敖玖壹
HE Xun;TAN Zhengjie;AO Jiuyi(College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637000,China;Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,Nanchong 637000,China)
出处
《工业技术创新》
2022年第2期9-16,共8页
Industrial Technology Innovation
基金
国家自然科学基金面上项目(21571148)。
