{"title":"Triple Salts Electrolyte for High Cyclability and High Capability in Practical Safe Nickel-Rich Batteries","authors":"Xuning Feng, Yingchen Xie, Qiang Wu, Zhihao Liu, Liyuan Zheng, Yu Wu, Dongsheng Ren, Chengshan Xu, Xuebing Han, Languang Lu, Chunyan Luo, Li Wang, Minggao Ouyang, Xiangming He","doi":"10.1016/j.nanoen.2024.110357","DOIUrl":null,"url":null,"abstract":"The pursuit of extended driving ranges of electric vehicles has spurred the use of nickel-rich layered cathodes, yet raised safety concerns. Existing ethylene carbonate-free electrolytes improve safety but compromise electrochemical performances due to the delicate balance between anode interphases. We introduce a novel electrolyte composed of propylene carbonate (PC) and triple lithium salts, which synergistically reinforces both cathode and anode interfaces. PC's low kinetic reactivity with LiNi<sub>0.8</sub>Mn<sub>0.1</sub>Co<sub>0.1</sub>O<sub>2</sub> (NCM811) at the cathode minimizes heat generation and oxygen evolution. To stabilize the anode, bis(fluorosulfonyl)imide (FSI<sup>-</sup>) anions are integrated to construct an anion-driven interface, while difluoro(oxalato)borate (DFOB<sup>-</sup>) is added to lower PC's de-solvation energy and prevent co-intercalation. NCM811/Graphite pouch cells utilizing this electrolyte show enhanced safety, cyclability, and rate capability, surviving 60<!-- --> <!-- -->minutes at 180℃ without incident. Post-mortem analysis reveals suppressed parasitic reactions and the formation of a robust solid electrolyte interphase (SEI). This research offers a critical framework for the design of electrolytes tailored for high-energy lithium-ion batteries.","PeriodicalId":394,"journal":{"name":"Nano Energy","volume":null,"pages":null},"PeriodicalIF":16.8000,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Energy","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.nanoen.2024.110357","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The pursuit of extended driving ranges of electric vehicles has spurred the use of nickel-rich layered cathodes, yet raised safety concerns. Existing ethylene carbonate-free electrolytes improve safety but compromise electrochemical performances due to the delicate balance between anode interphases. We introduce a novel electrolyte composed of propylene carbonate (PC) and triple lithium salts, which synergistically reinforces both cathode and anode interfaces. PC's low kinetic reactivity with LiNi0.8Mn0.1Co0.1O2 (NCM811) at the cathode minimizes heat generation and oxygen evolution. To stabilize the anode, bis(fluorosulfonyl)imide (FSI-) anions are integrated to construct an anion-driven interface, while difluoro(oxalato)borate (DFOB-) is added to lower PC's de-solvation energy and prevent co-intercalation. NCM811/Graphite pouch cells utilizing this electrolyte show enhanced safety, cyclability, and rate capability, surviving 60 minutes at 180℃ without incident. Post-mortem analysis reveals suppressed parasitic reactions and the formation of a robust solid electrolyte interphase (SEI). This research offers a critical framework for the design of electrolytes tailored for high-energy lithium-ion batteries.
期刊介绍:
Nano Energy is a multidisciplinary, rapid-publication forum of original peer-reviewed contributions on the science and engineering of nanomaterials and nanodevices used in all forms of energy harvesting, conversion, storage, utilization and policy. Through its mixture of articles, reviews, communications, research news, and information on key developments, Nano Energy provides a comprehensive coverage of this exciting and dynamic field which joins nanoscience and nanotechnology with energy science. The journal is relevant to all those who are interested in nanomaterials solutions to the energy problem.
Nano Energy publishes original experimental and theoretical research on all aspects of energy-related research which utilizes nanomaterials and nanotechnology. Manuscripts of four types are considered: review articles which inform readers of the latest research and advances in energy science; rapid communications which feature exciting research breakthroughs in the field; full-length articles which report comprehensive research developments; and news and opinions which comment on topical issues or express views on the developments in related fields.