Construction of Ti ₃ C ₂ T _x MXene with Hopping Migration Mechanism via Deep Eutectic Supramolecular Polymers Anode for Sodium Ion Batteries

Abstract The potential applications of high‐power sodium‐ion batteries are numerous, including use in distributed energy storage power plants and electric vehicles. In order to develop anode materials with fast sodium‐ion reaction kinetics and high reversibility, the use of deep eutectic supramolecular polymers to electrode materials is pioneered. The LA‐DESP is in situ polymerized on the Ti ₃ C ₂ T _x MXene surface, resulting in electrode materials that exhibit rapid reaction kinetics and high‐capacity retention. The supramolecular polymer network constructs channels for high‐speed transport of ions and electrons, and also provides more Na ⁺ pseudocapacitance storage sites. In addition, the superior mechanical properties of the polymer network help protect MXene structure from damage during cycling, resulting in ultrastable Na ⁺ storage. The hopping migration mechanism of Na ⁺ through the polymer‐constructed ion transport channels is proposed. As the anode of SIBs half‐cells, it exhibits remarkable cycling performance of 114.4 mAh g ⁻¹ and a capacity loss of only 5.1% at 1000 mA g ⁻¹ after 1500 cycles. This study opens a new way to rationally design the structure of MXene polymers and promotes the application of deep eutectic supramolecular polymers in electrodes.