Towards Sustainable Dual-Ion Batteries: Azacyclic Anchor-Polymeric Binder for Cohesive Graphite Cathode
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Advanced energy storages are indispensable for expanding electric mobility applications. While anion intercalation-type redox chemistry in graphite cathodes has opened the path to fast-charging and high-energy-density batteries, a significant challenge remains: the large-volume-change of graphite upon anion intercalation. Here, we present a novel binder and cohesive graphite cathode design for dual-ion batteries, which exhibit remarkable stability under high voltage conditions (>5 V). Our binder integrates an acrylate segment for self-healing properties, and an azide segment for forming azacyclic covalent bonds with graphite and interchain crosslinking. A one-hour UV treatment is sufficient for binder fixation within the electrode, leading to the covalent bond formation with graphite and the creation of a robust 3D network. This modification facilitates deeper and more reversible anion intercalation, leading to improved capacity, extended lifespan, and sustainable anion storage.