一步法合成锚定在3D纳米碳上的超薄MoS_(2)用于高稳定性钠离子电池负极研究  

Study on simultaneous synthesis of ultrathin MoS_(2) anchored on 3D nano carbon and its application in high and stable sodium ion battery anodes

作　　者：许占位[1] 任宇川 赵家祺 李嘉胤[1] 严皓 陈思雨 张姿纬 王盈[1] XU Zhan-wei;REN Yu-chuan;ZHAO Jia-qi;LI Jia-yin;YAN Hao;CHEN Si-yu;ZHANG Zi-wei;WANG Ying(School of Material Science and Engineering,Shaanxi University of Science&Technology,X′an 710021,China)

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2022年第6期116-121,共6页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(51702198);陕西省科技厅自然科学基金项目(2019JLM-3)。

摘　　要：MoS_(2)的理论比容量高(670 mAh g^(-1)),层间距大,有利于钠离子的嵌入脱出,但由于充放电过程中会不可避免地产生体积膨胀进而造成堆叠,导致容量衰减。合成超小MoS_(2)片与碳材料复合可以有效解决MoS_(2)充放电过程中产生的堆叠问题。本工作利用粗酞菁作为前驱体,成功地合成出锚定在3D纳米碳上的超薄MoS_(2).少层的MoS_(2)提供了更多的空间,缓解了钠离子嵌入脱出引起的体积膨胀,并且当固定在碳材料上时,MoS_(2)的(002)层间距提高到了0.67 nm.此外,所得的材料在0.1 C循环200圈后仍能保持356 mAh g^(-1)的比容量,库伦效率保持在99.8%.MoS_(2) with the theoretical capacity of 670 mAh g^(-1) has a large layer spacing,which is conductive for the insertion/extraction of Na^(+).However,during the charge/discharge process,MoS_(2) suffers volume expansion leads to stacks of sheets causing a poor capacity.Synthesis of ultra-small MoS_(2) flakes and composite with carbon materials can effectively solve the stacks of MoS_(2) during charge and discharge.In this work,ultrathin/ultrafine MoS_(2) was synthesized anchored on 3D nanocarbons using unpurified crude phthalocyanine,the few-layer MoS_(2) provides more space to alleviate the volume expansion,and the(002)interlayer space of MoS_(2) is improved to 0.67 nm when immobilized on carbon materials.The obtained materials get a capacity of 356 mAh g^(-1) after 200 cycles at 0.1C,coulombic efficiency remains at 99.8%.

关 键 词：MoS_(2) 三维碳结构 钠离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]