High-Performance Rechargeable Aluminum-Ion Batteries Enabled by Composite FeF_3 @ Expanded Graphite Cathode and Carbon Nanotube-Modified Separator

Juyan Zhang; Lan Zhang; Yunlong ZhaoJiashen MengBohua WenKashem M. MuttaqiRabiul IslamQiong CaiSuojiang Zhang

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High-Performance Rechargeable Aluminum-Ion Batteries Enabled by Composite FeF_3 @ Expanded Graphite Cathode and Carbon Nanotube-Modified Separator

机译：High-Performance Rechargeable Aluminum-Ion Batteries Enabled by Composite FeF_3 @ Expanded Graphite Cathode and Carbon Nanotube-Modified Separator

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Rechargeable aluminum ion batteries (AIBs) are one of the most promising batterytechnologies for future large-scale energy storage due to their high theoreticalvolumetric capacity, low-cost, and high safety. However, the low capacityof the intercalation-type cathode materials reduces the competitiveness of AIBsin practical applications. Herein, a conversion-type FeF_3-expanded graphite(EG) composite is synthesized as a novel cathode material for AIBs with goodconductivity and cycle stability. Combined with the introduction of a singlewallcarbon nanotube modified separator, the shuttle effect of the intermediateproduct, FeCl_2, is significantly restrained. Moreover, enhanced coulombicefficiency and reversible capacity are achieved. The AIB exhibits a satisfyingreversible specific capacity of 266 mAh g~(?1) at 60 mA g~(?1) after 200 cycles, andgood Coulombic efficiency of nearly 100 after 400 cycles at a current density of100 mA g~(?1). Ex situ X-ray diffraction and X-ray photoelectron spectroscopy areapplied to explore the energy storage mechanism of FeF_3 in AIBs. The resultsreveal that the intercalation of Al~(3+) species and the reduction of Fe~(3+) speciesoccurrs in the discharge process. These findings are meaningful for the fundamentalunderstanding of the FeF_3 cathode for AIBs and provide unprecedentedinsight into novel conversion type cathode materials for AIBs.

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来源
《Advanced energy materials》 |2022年第31期|2200959.1-2200959.11|共11页
作者
Juyan Zhang; Lan Zhang; Yunlong ZhaoJiashen MengBohua WenKashem M. MuttaqiRabiul IslamQiong CaiSuojiang Zhang;
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Institute of Process EngineeringChinese Academy of SciencesBeijing 100190, China Department of Chemical and Process EngineeringUniversity of SurreyGuildford GU2 7XH, UK;

Institute of Process EngineeringChinese Academy of SciencesBeijing 100190, China;

Advanced Technology InstituteDepartment of Electrical and Electronic EngineeringUniversity of SurreyGuildford GU2 7XH, UKSchool of Materials Science and EngineeringPeking UniversityBeijing 100871, ChinaTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055, ChinaComputer and Telecommunications EngineeringUniversity of WollongongNew South Wales 2522, AustraliaDepartment of Chemical and Process EngineeringUniversity of SurreyGuildford GU2 7XH, UK;

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aluminum ion batteries; conversion reactions; expanded graphite; iron fluoride; modified separators;

High-Performance Rechargeable Aluminum-Ion Batteries Enabled by Composite FeF_3 @ Expanded Graphite Cathode and Carbon Nanotube-Modified Separator

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