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Inspired by "quenching-cracking" strategy: Structure-based design of sulfur-doped graphite felts for ultrahigh-rate vanadium redox flow batteries
Xu, Zeyu1,2; Zhu, Mingdong3; Zhang, Kaiyue1,2; Zhang, Xihao1,2; Xu, Lixin3; Liu, Jianguo1; Liu, Tao4; Yan, Chuanwei1
Corresponding AuthorLiu, Jianguo(jgliu@imr.ac.cn)
2021-08-01
Source PublicationENERGY STORAGE MATERIALS
ISSN2405-8297
Volume39Pages:166-175
AbstractVanadium 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.
KeywordVanadium redox flow battery Structural modulation Flow channels Hierarchical fibers Charge-discharge performance
Funding OrganizationNational Natural Science Foundation of China
DOI10.1016/j.ensm.2021.04.025
Indexed BySCI
Languageen
Funding ProjectNational Natural Science Foundation of China[21975267] ; National Natural Science Foundation of China[61802116]
WOS Research AreaChemistry ; Science & Technology - Other Topics ; Materials Science
WOS SubjectChemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS IDWOS:000655761400004
PublisherELSEVIER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/160284
Collection中国科学院金属研究所
Corresponding AuthorLiu, Jianguo
Affiliation1.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
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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.
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