Multicore-shell iron fluoride@carbon microspheres as a long-life cathode for high-energy lithium batteries
Jiang, Ziang (Central South University)
Wang, Yujie (Central South University)
Chen, Xuanfeng (Central South University)
Chu, Fulu (Central South University)
Jiang, Xuansi (Central South University)
Kwofie, Felix (Central South University)
Pei, Qianfan (Central South University)
Luo, Shunrui (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Wu, Feixiang (Central South University)

Data:	2023
Resum:	The study of multi-electron conversion cathodes is an important direction for developing next-generation rechargeable batteries. Iron fluoride (FeF), in particular, has a high theoretical specific capacity (712 mA h g) and a low cost for Li storage. However, the FeF material suffers from poor conductivity, volume change and active material dissolution, resulting in voltage hysteresis and poor cycling and rate performance during electrochemical reactions. Here novel multicore-shell FeF@carbon (C) composite microspheres with FeF nanoparticles embedded in carbon shells are developed through a bottom-up method and demonstrate smaller FeF particle size, a good carbon coating and superior maintenance of carbon shell integrity after fluorination and cycling as well. The FeF@C/Li cells exhibit excellent electrochemical properties, offering a reversible capacity of 511. 4 mA h g at 0. 2C after 250 cycles and outstanding cycle stability for 3500 cycles, with a capacity retention of 81% at 1C. It is worth noting that the carbon shell effectively inhibits the dissolution and diffusion of the active material and enhances the electrode reaction kinetics during charge/discharge reactions together with reduced core size. Overall, the sophisticatedly designed multicore-shell structure not only effectively improves the electrochemical properties of FeF but also offers a new idea for refining transition metal-based electrode materials.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00457 Agencia Estatal de Investigación PID2020-116093RB-C43 Agencia Estatal de Investigación CEX2021-001214-S
Nota:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Drets:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Matèria:	Active material ; Carbon microspheres ; Carbon shells ; Energy ; Li-storage ; Long life ; Low-costs ; Multi-cores ; Multi-electron ; Specific capacities
Publicat a:	Journal of materials chemistry. A, Vol. 11, Issue 40 (October 2023) , p. 21541-21552, ISSN 2050-7496

DOI: 10.1039/d3ta05054h

Postprint 15 p, 2.7 MB

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