摘要
柔性钠离子电池(SIBs)在便携式和可穿戴设备中具有巨大的应用潜力,因为它们在特定情况下具有适用性和价格优势.在正极材料中,磷酸盐电极材料具有结构稳定性好、工作电位高和寿命长的优点.然而,由于对制造要求苛刻,反应复杂,以及柔性基材的缺失等问题,柔性磷酸盐电极材料的设计仍然是一个巨大的挑战.在此,我们报道了在柔性多孔碳纳米纤维上垂直生长的VO_(2)纳米片原位转化为三维氟磷酸钒钠纳米棒阵列(PCNF@NVOPF NR).PCNF@NVOPF NR实现了兼具柔性与高压正极电极的特点,并具有长期循环稳定性(4500次循环后容量保持率为87.6%).阵列结构可以确保快速的钠反应动力学和低界面电阻.此外,PCNF@NVOPF NR//PCNF@VO_(2)NS@C钠离子全电池表现出高能量和功率密度(220.5 W h kg^(-1)和9400 W kg^(-1)).这种用于柔性正极的材料设计策略可促进实用钠离子电池的商业化.
Flexible sodium-ion batteries(SIBs)have enormous potential in portable and wearable devices due to their suitability and price advantage in particular scenarios.Among the cathode materials,phosphate electrode materials have the advantage of good structural stability,high working potential and long lifespan.However,the design of flexible phosphates electrode materials is still a challenge due to hush fabrication requirements,complex reactions and absence of flexible substrates.Herein,we report the in-situ fabrication of three-dimensional sodium vanadium fluorophosphate nanorod array(PCNF@NVOPF NR)from vertically grown VO_(2) nanosheets on flexible porous carbon nanofibers.The PCNF@NVOPF NR as a flexible high-voltage cathode possesses long-term cycling stability(87.6%capacity retention after 4500 cycles).The nanorod arrays can ensure fast sodium reaction kinetics and low interfacial resistance.Moreover,PCNF@NVOPF//PCNF@VO_(2) NS@C full SIBs exhibit high energy and power density(220.5 W h kg^(-1) and 9400 W kg^(-1)).This material design strategy for flexible cathode will inspire the commercialization of practical SIBs.
作者
许东明
陈瑞强
陈本强
周双
张杨璞
常智
潘安强
Dongming Xu;Ruiqiang Chen;Benqiang Chen;Shuang Zhou;Yangpu Zhang;Zhi Chang;Anqiang Pan(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Key Laboratory of Electronic Packaging and Advanced Functional Materials of Hunan Province,Central South University,Changsha 410083,China)
基金
supported by the National Natural Science Foundation of China(51874362 and 22209208)。
