当前位置: X-MOL 学术Adv. Mater. Interfaces › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Constructing Multichannel Carbon Fibers as Freestanding Anodes for Potassium‐Ion Battery with High Capacity and Long Cycle Life
Advanced Materials Interfaces ( IF 5.4 ) Pub Date : 2019-12-29 , DOI: 10.1002/admi.201901829
Ying Xu 1 , Tao Yuan 1 , Yahui Zhao 1 , Hongfei Yao 1 , Junhe Yang 1 , Shiyou Zheng 1
Affiliation  

Potassium‐ion battery (PIB) is a potential low‐cost energy storage technology owing to the abundant source and wide distribution of potassium element. However, the PIB usually suffers from poor cycling and rate performance induced by volume expansion and sluggish potassiation kinetics. Herein, multichannel carbon fibers (MCCFs) are rationally constructed as freestanding PIB anodes by electrospinning suitable ratio of poly(methyl methacrylate)/polyacrylonitrile with subsequent calcination treatment. The MCCF electrode shows a high reversible capacity/charge capacity of 420.1/304.2 mAh g−1 at current density of 50 mA g−1 and delivers a capacity of 110.9 mAh g−1 over 2000 cycles at a higher current density of 2000 mA g−1. The excellent electrochemical performance is attributed to the unique multichannels in amorphous MCCFs for buffering volume change and facilitating electrolyte infiltration, as well as high conductivity of N‐, O‐doping in MCCFs. This strategy of fabricating multifunctional electrode materials provides an effective approach to develop high‐performance materials for cost‐effective alkali‐ion batteries.

中文翻译:

构建多通道碳纤维作为高容量,长寿命的钾离子电池独立式阳极

由于钾元素来源丰富且分布广泛,钾离子电池(PIB)是一种潜在的低成本储能技术。然而,由于体积膨胀和缓慢的钾化动力学,PIB通常遭受不良的循环和速率性能的困扰。在此,通过电纺适当比例的聚(甲基丙烯酸甲酯)/聚丙烯腈并随后进行煅烧处理,将多通道碳纤维(MCCF)合理地构造为独立式PIB阳极。MCCF电极在50 mA g -1的电流密度下显示出420.1 / 304.2 mAh g -1的高可逆容量/充电容量,并在2000 mA的较高电流密度下在2000次循环中提供110.9 mAh g -1的容量-1。优异的电化学性能归因于无定形MCCF中独特的多通道,可缓冲体积变化并促进电解质渗透,以及MCCF中N,O掺杂的高电导率。这种制造多功能电极材料的策略为开发高性价比的碱离子电池高性能材料提供了一种有效的方法。
更新日期:2019-12-29
down
wechat
bug