Synergistic effect of sulfolane and lithium Difluoro(oxalate)borate on improvement of compatibility for LiNi0.8Co0.8Al0.05O2 electrode
Zhang, Feilong1,2; Wang, Chao1; Zhao, Dongni1; Yang, Li1; Wang, Peng1; Li, Wenbo1; Wang, Bo1; Li, Shiyou1,2
2020-03-20
Source PublicationELECTROCHIMICA ACTA
ISSN0013-4686
Volume337
AbstractHigh nickel LiNi0.8Co0.8Al0.05O2 (NCA) cathode material has become one of the most promising cathode materials in the field of power batteries, but the side reaction between the conventional LiPF6-based electrolyte and the surface of the NCA material results in poor material interface stability. In this work, a compatible lithium difluoro(oxalate)borate (LiDFOB)-based electrolyte by the employment of sulfolane (SL) as a representative sulfur-containing solvent has been built to enhance the interfacial stability of NCA electrode. The composition, morphology and electrochemical properties are studied by X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy et al. Results show that the decomposition of LiDFOB on the surface of the positive electrode material contributes to forming a uniform cathode electrolyte interface (CEI) film, which subsequently reduces the dissolution of metal ions and hinders the structure transition of the material from the layered structure to spinel or rock-salt phases. Besides, the sulfur-containing products resulted from the decomposition of SL promote the conductivity of Li+ ions for CEI film, which makes up for shortcomings of LiDFOB. Moreover, more Li+ has been formed due to the synergistic action between LiDFOB salt and SL solvent, improving the stability and density of CEI film, reducing the thickness of CEI film, and further improving the cycle performance of the battery. (C) 2020 Elsevier Ltd. All rights reserved.
KeywordLiNi0.8Co0.8Al0.05O2 Lithium difluoro(oxalate)borate Sulfolane Interfacial stability Synergistic effect
DOI10.1016/j.electacta.2020.135727
Indexed BySCI
Language英语
Funding ProjectTransformation of Scientific and Technological Achievements of Gansu Institutions of Higher Education[2017D-04] ; High Value Patent Conversion Implementation Project[18ZC1LA014] ; Gansu Province Science and Technology Major Project[17ZD2GC011]
WOS Research AreaElectrochemistry
WOS SubjectElectrochemistry
WOS IDWOS:000521531700070
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/64155
Collection石油化工学院
马克思主义学院
图书馆
Corresponding AuthorLi, Shiyou
Affiliation1.Lanzhou Univ Technol, Coll Petrochem Technol, Lanzhou 730050, Peoples R China
2.Gansu Engn Lab Electrolyte Mat Lithium Ion Batter, Lanzhou 730050, Peoples R China
First Author AffilicationColl Petrochem Engn
Corresponding Author AffilicationColl Petrochem Engn
First Signature AffilicationColl Petrochem Engn
Recommended Citation
GB/T 7714
Zhang, Feilong,Wang, Chao,Zhao, Dongni,et al. Synergistic effect of sulfolane and lithium Difluoro(oxalate)borate on improvement of compatibility for LiNi0.8Co0.8Al0.05O2 electrode[J]. ELECTROCHIMICA ACTA,2020,337.
APA Zhang, Feilong.,Wang, Chao.,Zhao, Dongni.,Yang, Li.,Wang, Peng.,...&Li, Shiyou.(2020).Synergistic effect of sulfolane and lithium Difluoro(oxalate)borate on improvement of compatibility for LiNi0.8Co0.8Al0.05O2 electrode.ELECTROCHIMICA ACTA,337.
MLA Zhang, Feilong,et al."Synergistic effect of sulfolane and lithium Difluoro(oxalate)borate on improvement of compatibility for LiNi0.8Co0.8Al0.05O2 electrode".ELECTROCHIMICA ACTA 337(2020).
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