Yixin Zhu, Boning Ou, Chongwei Gao, Yueteng Gao, Biao Zhang, Feiyu Kang and Dengyun Zhai*,
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引用次数: 0
Abstract
Vanadium-based fluoride phosphate polyanionic compounds are the most competitive candidates for cathode materials in potassium-ion batteries (PIBs). However, they have faced the long-standing obstacle of poor intrinsic kinetics that has yet to be overcome, ascribed to the unique electron transfer pattern in the covalently bonded structures. Herein, by adjusting the coordinated circumstance of the V octahedron via the introduction of a large-sized and weak-field ligand Cl–, we synthesized KVPO4F0.9Cl0.1 (KVPFCl) with fast kinetics. A distorted octahedral symmetry with the larger Cl– expands the lattice structure, facilitating K+ ion diffusion in the KVPFCl material. Furthermore, accelerated electronic kinetics is achieved via the stronger electron donor Cl–, which stimulates the hybridization of the V 3d orbital and the 2p/3p orbitals of the ligands and narrows the crystal field splitting energy. Therefore, the as-prepared KVPFCl has a high rate capability and capacity retention. Our results provide prospective insights into achieving fast kinetics in vanadium fluorophosphate polyanionic materials for PIBs.
ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment
CiteScore
31.20
自引率
5.00%
发文量
469
审稿时长
1 months
期刊介绍:
ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format.
ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology.
The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.