Fluorine‐Free Lithium‐Ion Capacitor with Enhanced Sustainability and Safety Based on Bio‐Based ƴ‐Valerolactone and Lithium Bis(Oxalato)Borate Electrolyte

• DOI: 10.1002/adma.202310056
• Publication Date: 2024-01-22T20:08:49Z
• Authors: Khai Shin Teoh; Massimo Melchiorre; Sandesh Darlami M...; Marius Hermesdorf; Desirée Leistensc...; Martin Oschatz; Francesco Ruffo; Juan Luis Gómez U...; Andrea Balducci
• Keywords: Fluorine; Thermal Stability

Abstract In this work, the properties of a novel electrolyte based on combination bio‐based ƴ‐valerolactone (GVL) solvent with lithium bis (oxalato)borate (LiBOB) salt and its use for lithium‐ion capacitors (LICs) are presented. It is shown that 1 m LiBOB in GVL displays good transport properties, high thermal stability, ability to prevent anodic dissolution. Its impact performance both battery‐type capacitive‐type electrodes evaluated. regard, special attention paid filming associated decomposition at electrode surfaces. To best authors’ knowledge, full‐cell devices assembled study first example fluorine‐free LIC. These exhibit favorable energy‐to‐power ratio, delivering 80 Wh kg −1 AM 10 000 W along excellent cycling retaining 80% initial capacitance after 25 cycles. Furthermore, post‐mortem analysis LIC conducted gain deeper insights into degradation mechanisms within device.