Inspired by "quenching-cracking" strategy: Structure-based design of sulfur-doped graphite felts for ultrahigh-rate vanadium redox flow batteries

doi:10.1016/j.ensm.2021.04.025

IMR OpenIR

	Inspired by "quenching-cracking" strategy: Structure-based design of sulfur-doped graphite felts for ultrahigh-rate vanadium redox flow batteries
	Xu, Zeyu 1,2; Zhu, Mingdong 3; Zhang, Kaiyue 1,2; Zhang, Xihao 1,2; Xu, Lixin 3; Liu, Jianguo 1; Liu, Tao 4; Yan, Chuanwei 1
通讯作者	Liu, Jianguo(jgliu@imr.ac.cn)
	2021-08-01
发表期刊	ENERGY STORAGE MATERIALS
ISSN	2405-8297
卷号	39 页码:166-175
摘要	Vanadium redox flow batteries (VRFBs) are perceived as promising candidates for grid-scale energy storage systems. However, limited improvements in electrode structures restrict the operation of VRFBs at high current densities. Herein, finite element simulations are used to guide the construction direction of the electrode structure. Afterwards, a quenching-cracking strategy is ingeniously employed to successfully construct parallel-aligned micron flow channels on electrode fibers in high agreement with the model, and the consistency of the flow channel structure is verified via deep learning technique. The well-constructed flow channels achieve high specific surface areas of electrodes while enabling the smooth flow of electrolyte over the fiber surfaces. Subsequent graphitization and sulfur-doping processes yield hierarchical fibers with highly conductive cores and well-active surfaces. Benefiting from fine structural modulation, the battery equipped with the as-prepared electrodes delivers an energy efficiency of 80.44 % at an ultra-high current density of 500 mA cm(-2) and achieves a peak power density of 1.68 W cm(-2). Additionally, the battery is consistently cycled for 1000 cycles at 500 mA cm(-2) and the average energy efficiency decay is only 0.01032 % per cycle. Notably, finite element simulations are applied to investigate the velocity distribution of electrolyte in the flow channels, and first-principle calculations are employed to reveal the cause for energy efficiency decay of the battery after long-term cycling. Most importantly, the establishment of structure-activity relationships highlights the significance of comprehensive modulation of electrode fiber structures towards enhancing the performance of VRFBs.
关键词	Vanadium redox flow battery Structural modulation Flow channels Hierarchical fibers Charge-discharge performance
资助者	National Natural Science Foundation of China
DOI	10.1016/j.ensm.2021.04.025
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[21975267] ; National Natural Science Foundation of China[61802116]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000655761400004
出版者	ELSEVIER
引用统计	被引频次：21[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/160284
专题	中国科学院金属研究所
通讯作者	Liu, Jianguo
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Henan Inst Technol, Sch Comp Sci & Technol, Xinxiang 453003, Henan, Peoples R China 4.Chinese Acad Sci, Dalian Inst Chem Phys, Div Energy Storage, Dalian 116023, Peoples R China
推荐引用方式 GB/T 7714	Xu, Zeyu,Zhu, Mingdong,Zhang, Kaiyue,et al. Inspired by "quenching-cracking" strategy: Structure-based design of sulfur-doped graphite felts for ultrahigh-rate vanadium redox flow batteries[J]. ENERGY STORAGE MATERIALS,2021,39:166-175.
APA	Xu, Zeyu.,Zhu, Mingdong.,Zhang, Kaiyue.,Zhang, Xihao.,Xu, Lixin.,...&Yan, Chuanwei.(2021).Inspired by "quenching-cracking" strategy: Structure-based design of sulfur-doped graphite felts for ultrahigh-rate vanadium redox flow batteries.ENERGY STORAGE MATERIALS,39,166-175.
MLA	Xu, Zeyu,et al."Inspired by "quenching-cracking" strategy: Structure-based design of sulfur-doped graphite felts for ultrahigh-rate vanadium redox flow batteries".ENERGY STORAGE MATERIALS 39(2021):166-175.