Boron‐Based Functional Additives Enable Solid Electrolyte Interphase Engineering in Calcium Metal Battery. Issue 1 (8th November 2022)

• Record Type: Journal Article
• Authors: Bodin, Charlotte; Forero Saboya, Juan; Jankowski, Piotr; Radan, Kristian; Foix, Dominique; Courrèges, Cécile; Yousef, Ibraheem; Dedryvère, Rémi; Davoisne, Carine; Lozinšek, Matic; Ponrouch, Alexandre
• Is Part Of: Batteries & supercaps. Volume 6:Issue 1(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-11-08
• Subjects: boron-based adducts -- calcium batteries -- electrolyte additive -- solid electrolyte interphase; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202200433
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Calcium‐metal batteries have received growing attention recently after several studies reporting successful metal plating and stripping with organic electrolytes. Given the low redox potential of metallic calcium, its surface is commonly covered by a passivation layer grown by the accumulation of electrolyte decomposition products. The presence of borate species in this layer has been shown to be a key parameter allowing for Ca 2+ migration and favoring Ca electrodeposition. Here, boron‐based additives are evaluated in order to tune the SEI composition, morphology, and properties. The decomposition of a BF3 ‐based additive is studied at different potentiostatic steps and the resulting SEI layer was thoroughly characterized. SEI growth mechanism is proposed based on both experimental data and DFT calculations pointing at the formation of boron‐crosslinked polymeric matrices. Several boron‐based adducts are explored as SEI‐forming additives for calcium‐metal batteries paving the way to very rich chemistry leading to Ca 2+ conducting SEI. Abstract : Engineering of Ca‐based SEI using boron‐based additives is investigated and their morphology, composition, and properties are thoroughly characterized. The presence of boron‐crosslinked polymeric matrices in the passivation layer plays a major role allowing for Ca plating. Growth mechanism for such Ca 2+ conducting SEI and experimental conditions favoring its formation are presented.