Hybridizing Anions towards Fast Diffusion Kinetics for Tri-Ion Batteries with Significantly Improved Rate Capability and Cycling Life - Journal of Materials Chemistry A (RSC Publishing)

Dual-ion batteries are promising candidates for next-generation energy storage devices for their merits of low cost, environmental friendliness and easy recovery. However, intercalation/deintercalation of large anions usually causes slow ion diffusion kinetics and large volume variation in graphite cathode leading to unsatisfactory rate capability and poor cycling stability. Herein, we report a new aluminum-graphite tri-ion (Li+/PF6-/BF4-) battery configuration (named as AGTIB) using an anion-hybridization strategy by combining PF6- with BF4- in the electrolyte. An optimized AGTIB is demonstrated to exhibit fast ion diffusion kinetics and substantially reduced volume changes in the graphite cathode during cycling. The AGTIB has a high rate performance with a 90.5 mAh g-1 capacity at 15C (92.5% retention compared to 2C) and good cycling stability for over 500 cycles at 5C with negligible capacity decay. The present finding suggests that the facile anion hybridization strategy shows promising application for exploring high-performance energy storage devices. The article wasreceived on 22 Mar 2019,accepted on 04 Apr 2019andfirst published on 08 Apr 2019 If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you mustformally request permission using Copyright Clearance Center. Go to ourInstructions for using Copyright Clearance Center page for details. Authors contributing to RSC publications (journal articles, books or book chapters) do not need to formally request permission to reproduce material contained in this article provided that the correct acknowledgement is given with the reproduced material. Reproduced material should be attributed as follows: For reproduction of material from NJC: Reproduced from Ref. XX with permission from the Centre National de la Recherche Scientifique (CNRS) and The Royal Society of Chemistry. For reproduction of material from PCCP: Reproduced from Ref. XX with permission from the PCCP Owner Societies. For reproduction of material from PPS: Reproduced from Ref. XX with permission from the European Society for Photobiology, the European Photochemistry Association, and The Royal Society of Chemistry. For reproduction of material from all other RSC journals and books: Reproduced from Ref. XX with permission from The Royal Society of Chemistry. If the material has been adapted instead of reproduced from the original RSC publication "Reproduced from" can be substituted with "Adapted from". In all cases the Ref. XX is the XXth reference in the list of references. If you are the author of this article you do not need to formally request permission to reproduce figures, diagrams etc. contained in this article in third party publications or in a thesis or dissertation provided that the correct acknowledgement is given with the reproduced material. Reproduced material should be attributed as follows: For reproduction of material from NJC: [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC For reproduction of material from PCCP: [Original citation] - Reproduced by permission of the PCCP Owner Societies For reproduction of material from PPS: [Original citation] - Reproduced by permission of The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC For reproduction of material from all other RSC journals: [Original citation] - Reproduced by permission of The Royal Society of Chemistry If you are the author of this article you still need to obtain permission to reproduce the whole article in a third party publication with the exception of reproduction of the whole article in a thesis or dissertation. Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.



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