摘要
Bi/Sb/Sn基合金型钾离子电池负极材料在嵌钾/脱钾的过程中产生巨大的体积膨胀,从而导致电极材料粉化失效.为了解决这一问题,该研究利用静电纺丝法制备了由Bi_(0.2)Sb_(0.6)Sn_(0.2)纳米粒子均匀分散在碳纤维中,随后经S、Se共掺杂制备了性能优异的Bi_(0.2)Sb_(0.6)Sn_(0.2)SSe@C复合材料.该复合材料充分地利用多元素之间的协调作用及碳纤维提供的机械约束,有效地缓解了充放电过程中电极材料的体积变化,展现了出色的倍率性能(1000 mA·g^(-1)电流密度下比容量为137.3 mAh·g^(-1))和优异的循环稳定性(500 mA·g^(-1)电流密度下循环100次后的比容量为311.5 mAh·g^(-1)).动力学分析测试结果表明该复合材料具有出色的赝电容特性和优异的K^(+)扩散能力.
Potassium-ion battery anode materials based on Bi/Sb/Sn alloys produce large volume expansion during the potassiation and dispotassiation processes,which leads to electrode pulverization.In this work,a composite material is prepared by electrospinning method,with Bi_(0.2)Sb_(0.6)Sn_(0.2)nanoparticles dispersed in carbon fibers uniformly.Subsequently,Bi_(0.2)Sb_(0.6)Sn_(0.2)SSe@C composite is synthesized by sulfur and selenium co-doping.Benefiting from the synergistic effects among different elements and mechanical confinement provided by carbon fibers,the volume change of anode material is mitigated during the charge-discharge cycles effectively.It exhibits excellent cycling performance(specific capacity reaches 311.5 mAh·g^(-1),100 cycles at 500 mA·g^(-1))and outstanding rate capability(specific capacity is 137.3 mAh·g^(-1)at 1000 mA·g^(-1)).Kinetic analysis reveals superior pseudocapacitive properties and excellent K^(+)diffusion capability.
作者
吴俊东
翟家丰
裴权
宋帅
童依婷
张庆丰
谢淑红
WU Jundong;ZHAI Jiafeng;PEI Quan;SONG Shuai;TONG Yiting;ZHANG Qingfeng;XIE Shuhong(School of Material Science and Engineering,Xiangtan University,Xiangtan 411105,China)
出处
《湘潭大学学报(自然科学版)》
2025年第4期1-9,共9页
Journal of Xiangtan University(Natural Science Edition)
基金
湖湘高层次人才聚集工程-创新团队项目(2018RS3091)。
作者简介
通信作者:谢淑红(1978-),女,湖南祁阳人,教授,博士生导师.E-mail:shxie@xtu.edu.cn。
