Journal article
In Situ Acoustic Diagnostics of Particle-Binder Interactions in Battery Electrodes
Joule, v 2(5), pp 988-1003
16 May 2018
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The high phase-transformation strain developed upon intercalation in the host particles of a composite battery electrode affects the polymeric binder network mechanically, deteriorating the electrode cycling performance. Here, electrochemical quartz crystal microbalance with dissipation monitoring (EQCM-D) is used to demonstrate a new strain-accommodation mechanism, in high-strain NaFePO4/PVdF electrodes, via relaxation of the binder network surrounding the intercalation particles. Complete mechanical degradation of the polymer network occurs during long-term cycling of NaFePO4 electrodes in aqueous solutions (hard and tough behavior). In contrast, in aprotic solutions, a softened binder easily accommodates the high transformation strain, ensuring excellent electrode cycling performance (soft and tough behavior). Quantification of the high-frequency viscoelastic properties of an operating composite electrode linked to the binder's fracture toughness ensures fast and facile screening of the optimal polymeric binder/electrolyte solution combinations. This methodology should be extremely important for optimization of cycling performance of Li-Si anodes undergoing huge volume changes during cycling.
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•New mechanism of strain accommodation in composite battery electrodes•Very quick screening of optimal binder-electrolyte solution combinations•Stiff binder exhibits small fracture toughness in high-strain composite electrodes•Soft binder with large fracture toughness mitigates high transformation strains
Almost all practical composite battery electrodes experience volume changes during cycling, deteriorating their cycling performance. A new key element that the EQCM-D methodology introduces into the energy storage field is a general platform for quantification of high-frequency viscoelastic characteristics of high-strain composite electrodes correlated with their low-frequency resilience and toughness moduli. Fast relaxation ensures effective high-strain accommodation by softened binder in aprotic solution. In contrast, with excessively stiff binder in aqueous solution, the strong electrode/binder interactions tracked dynamically reflect the initial and advanced stages of the mechanical degradation of the polymeric binder up to its complete destruction. The discovered correlation between the fracture toughness of the binder and its high-frequency viscoelastic behavior will serve for a rational design of extremely strained composite alloy-type electrodes such as the Li-Si anode.
Tough and brittle characters of the binder in composite battery electrodes stabilize/deteriorate their long-term cycling performance, respectively. Instead of performing conventional long-time cycling tests of battery electrodes followed by their postmortem analysis, the proposed accelerated EQCM-D diagnostic easily distinguishes between the stable and failed cycling modes of strained electrodes by characteristic coupled shifts in the recorded resonance frequency and resonance bandwidth changes on multiple harmonics (EQCM-D signatures).
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Details
- Title
- In Situ Acoustic Diagnostics of Particle-Binder Interactions in Battery Electrodes
- Creators
- Netanel Shpigel - Department of Chemistry and BINA – BIU Center for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, IsraelSergey Sigalov - Department of Chemistry and BINA – BIU Center for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, IsraelMikhael D Levi - Department of Chemistry and BINA – BIU Center for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, IsraelTyler Mathis - Department of Materials Science and Engineering, A.J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA 19104, USALeonid Daikhin - School of Chemistry, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Ramat Aviv 6997801, IsraelAlar Janes - Institute of Chemistry, University of Tartu, Ravila 14A, 50411 Tartu, EstoniaEnn Lust - Institute of Chemistry, University of Tartu, Ravila 14A, 50411 Tartu, EstoniaYury Gogotsi - Department of Materials Science and Engineering, A.J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA 19104, USADoron Aurbach - Department of Chemistry and BINA – BIU Center for Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat-Gan 5290002, Israel
- Publication Details
- Joule, v 2(5), pp 988-1003
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000435093800022
- Scopus ID
- 2-s2.0-85045914234
- Other Identifier
- 991014969851204721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Energy & Fuels
- Materials Science, Multidisciplinary