Greener, Safer and Better Performing Aqueous Binder for Positive Electrode Manufacturing of Sodium Ion Batteries

Xu, R and Pamidi, V and Tang, Y and Fuchs, S and Stein, HS and Dasari, B and Zhao-Karger, Z and Behara, S and Hu, Y and Trivedi, S and Anji Reddy, M and Barpanda, P and Fichtner, M (2024) Greener, Safer and Better Performing Aqueous Binder for Positive Electrode Manufacturing of Sodium Ion Batteries. In: ChemSusChem .

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Abstract

P2-type cobalt-free MnNi-based layered oxides are promising cathode materials for sodium-ion batteries (SIBs) due to their high reversible capacity and well chemical stability. However, the phase transformations during repeated (dis)charge steps lead to rapid capacity decay and deteriorated Na+ diffusion kinetics. Moreover, the electrode manufacturing based on polyvinylidene difluoride (PVDF) binder system has been reported with severely defluorination issue as well as the energy intensive and expensive process due to the use of toxic and volatile N-methyl-2-pyrrolidone (NMP) solvent. It calls for designing a sustainable, better performing, and cost-effective binder for positive electrode manufacturing. In this work, we investigated inorganic sodium metasilicate (SMS) as a viable binder in conjunction with P2-Na0.67Mn0.55Ni0.25Fe0.1Ti0.1O2 (NMNFT) cathode material for SIBs. The NMNFT-SMS electrode delivered a superior electrochemical performance compared to carboxy methylcellulose (CMC) and PVDF based electrodes with a reversible capacity of ~161 mAh/g and retaining ~83 after 200 cycles. Lower cell impedance and faster Na+ diffusion was also observed in this binder system. Meanwhile, with the assistance of TEM technique, SMS is suggested to form a uniform and stable nanoscale layer over the cathode particle surface, protecting the particle from exfoliation/cracking due to electrolyte attack. It effectively maintained the electrode connectivity and suppressed early phase transitions during cycling as confirmed by operando XRD study. With these findings, SMS binder can be proposed as a powerful multifunctional binder to enable positive electrode manufacturing of SIBs and to overall reduce battery manufacturing costs. © 2024 The Authors. ChemSusChem published by Wiley-VCH GmbH.

Item Type:	Journal Article
Publication:	ChemSusChem
Publisher:	John Wiley and Sons Inc
Additional Information:	The copyright for this article belongs to John Wiley and Sons Inc.
Keywords:	Cathodes; Chemical stability; Cobalt compounds; Cost effectiveness; Electrochemical electrodes; Electrolytes; Ionic liquids; Metal ions; Sodium compounds; Titanium compounds, Aqueous binder; Binder systems; Cathodes material; Cobalt free; In-situ coating; Layered oxide cathodes; Polyvinylidene difluoride; Positive electrodes; Sodium ion batteries; Sodium metasilicate, Sodium-ion batteries
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	01 Mar 2024 08:36
Last Modified:	01 Mar 2024 08:36
URI:	https://eprints.iisc.ac.in/id/eprint/83968

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