摘要
为开发性能优越、制备工艺简单的可充电锌离子电池(ZIBs)正极材料,以静电纺纳米纤维膜为前驱体,经预氧化和高温炭化制备了碳纳米纤维膜(CNFs),并以CNFs为基底,结合电化学沉积法制备了具有皮芯结构的MnO_(x)/CNFs复合材料。探讨了不同电化学沉积时间对MnO_(x)/CNFs复合材料表面形貌、结构以及ZIBs循环充放稳定性和倍率性能等电化学性能的影响。结果表明:电化学沉积法使MnO_(x)活性材料与CNFs基底间界良好结合,减少了活性材料脱附,提高了二者的界面离子和电子传输能力;以沉积2 h的MnO_(x)/CNFs作为正极时,ZIBs在0.1 A/g电流密度下的比容量可达647.9 mA·h/g,且在0.5 A/g电流密度下循环充放电500次后仍能保持221.8 mA·h/g的比容量;经2 A/g电流密度循环充放电后在0.1 A/g电流密度下仍能恢复至初始比容量的94%,具有较好倍率性能。
To develop cathode materials for rechargeable zinc ion batteries(ZIBs)with excellent performance and a simple preparation process,electrospun nanofiber membranes were used as precursors to prepare carbon nanofiber films(CNFs)by pre-oxidation and high-temperature carbonization.MnO_(x)/CNFs composites with the skin-core structure were prepared by using electrochemical deposition method with CNFs as substrate.The effects of electrochemical deposition time on the surface morphology,specific surface area,cyclic charge-discharge stability,and rate performance of MnO_(x)/CNFs composites were discussed.The results show that the electrochemical deposition method promotes a good interfacial bonding between the loaded active material and the CNFs substrate and improves the ion and electron transport capacity at the interface.The specific capacity can reach 647.9 mA·h/g after the activation at the current density of 0.1 A/g.In addition,the ZIBs with MnO_(x)/CNFs cathode via depositing MnO_(x) for 2 h show the specific capacity of 221.8 mA·h/g after 500 cycles under the current density of 0.5 A/g.After cycling of charging and discharging at the current density of 2 A/g,94%of the initial capacity can still be restored at the current density of 0.1 A/g,which represent excellent performance of MnO_(x)/CNFs cathode.
作者
杨科
闫俊
肖勇
徐晶
陈磊
刘雍
YANG Ke;YAN Jun;XIAO Yong;XU Jing;CHEN Lei;LIU Yong(School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China;Institute of Nonmetallic Materials of Shandong, Ji′nan, Shandong 250031, China;Technical Service Center of Quanzhou Customs, Quanzhou, Fujian 362000, China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2022年第5期77-85,共9页
Journal of Textile Research
基金
中国博士后科学基金特别资助项目(2019T120189)
中国博士后科学基金面上一等资助项目(2018M640240)。
关键词
碳纳米纤维膜
电化学沉积
静电纺丝
自支撑材料
锌离子电池
carbon nanofiber membrane
electrochemical deposition
electrostatic spinning
free-standing material
zinc ion battery
