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High-capacity zinc-iodine flow batteries enabled by a polymer-polyiodide complex cathode
Yang, Jing1,2; Song, Yuxi1; Liu, Qinghua3; Tang, Ao1
Corresponding AuthorTang, Ao(a.tang@imr.ac.cn)
2021-06-25
Source PublicationJOURNAL OF MATERIALS CHEMISTRY A
ISSN2050-7488
Pages6
AbstractConsuming one-third of iodide to stabilize the iodine for reversible I-/I-3(-) reactions is the major challenge for zinc-iodine flow batteries (ZIFBs) to realize high volumetric capacity. In this study, we report a polymer-polyiodide complex cathode to boost the iodide capacity of ZIFBs. By adding polyvinylpyrrolidone (PVP) to KI, electrochemical tests show that the formation of a polyiodide complex significantly promotes the oxidation of I- to I-3(-) by enabling an enhanced solubility of the I-2 film through interactions between PVP and I-2. Materials characterization and theoretical calculation further prove that the lone-pair electrons of oxygen from the carbonyl group of monomer NVP facilitate the formation of an I-O bond and result in the breaking of the I-I bond in I-2, creating an intermediate structure of NVP center dot 2I(-). Subsequently, the iodide in NVP center dot 2I(-) can further complex with oxidized I-2 forming soluble NVP-2I(3)(-), which facilitates the dissolution of the I-2 film and effectively frees up 1/3 iodide ions. Benefitting from the polyiodide complex, a ZIFB demonstrates a superior discharge capacity of 115 A h L-1 for up to 6 M I-, significantly unlocking the capacity of iodine. For long-term operation, the ZIFB with PVP in 6 M I- can continuously run for 600 cycles, affording a stable energy efficiency of 70%.
Funding OrganizationNatural Science Foundation of Liaoning Province ; Institute of Metal Research, Chinese Academy of Sciences
DOI10.1039/d1ta03905a
Indexed BySCI
Language英语
Funding ProjectNatural Science Foundation of Liaoning Province[2020-MS-012] ; Institute of Metal Research, Chinese Academy of Sciences
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000672933200001
PublisherROYAL SOC CHEMISTRY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/160044
Collection中国科学院金属研究所
Corresponding AuthorTang, Ao
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang, Peoples R China
2.Univ Sci & Technol China, Nano Sci & Technol Inst, Suzhou, Peoples R China
3.Natl Inst Clean & Low Carbon Energy, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Yang, Jing,Song, Yuxi,Liu, Qinghua,et al. High-capacity zinc-iodine flow batteries enabled by a polymer-polyiodide complex cathode[J]. JOURNAL OF MATERIALS CHEMISTRY A,2021:6.
APA Yang, Jing,Song, Yuxi,Liu, Qinghua,&Tang, Ao.(2021).High-capacity zinc-iodine flow batteries enabled by a polymer-polyiodide complex cathode.JOURNAL OF MATERIALS CHEMISTRY A,6.
MLA Yang, Jing,et al."High-capacity zinc-iodine flow batteries enabled by a polymer-polyiodide complex cathode".JOURNAL OF MATERIALS CHEMISTRY A (2021):6.
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