Interfacial Self-assembly of Organics/MXene Hybrid Cathodes Toward High-Rate-Performance Sodium Ion Batteries

作者：Yijun Gao, Ping Xue, Lijun Ji, Xin Pan, Lining Chen, Wei Guo, Mi Tang, Chengliang Wang, Zhengbang Wang · 发表于：ACS Applied Materials & Interfaces · 年份：2022 · DOI：10.1021/acsami.1c23840 · 被引用次数：40 · 研究领域：Advancements in Battery Materials、MXene and MAX Phase Materials、Advanced Battery Materials and Technologies

Conjugated quinones are promising cathode materials for sodium-ion batteries. However, the contemporary primary conjugated quinones cathodes still hold to limited capacity, poor rate performance and low cyclability, due to the poor electronic and ionic conductivity. Herein, a series of high-performance [email protected] hybrid cathodes is constructed by an in situ polymerization-assembly strategy based on the hydrogen bond and S–Ti interaction. The [email protected] 3 C 2 T x MXene hybrid, as a typical example, exhibits sandwiched structure with intimate [email protected] contact, resulting in efficient interfacial mass transfer. The assembled MXene is able to build interconnected conductive channels in the hybrid cathodes for continuous and fast electrons/ions transport, which is verified by both the experimental results and density functional theory (DFT) calculations. As a result, the optimal [email protected] hybrid electrode delivers excellent electrochemical performances with high capacity (∼242 mA h g –1 at 100 mA g –1 ), superior fast-charge/discharge ability (∼148 and 121 mA h g –1 at 5 and 10 A g –1, respectively), and ultralong cycle life (capacity as high as 57 mA h g –1 after 9000 cycles at 5 A g –1 ), which are more superior to that of the pure PAQS electrodes. Besides, the analogous [email protected] 3 C 2 T x MXene hybrid cathode also shows better performances compared to the pure materials.