Boosting Sodium Compensation Efficiency via a CNT/MnO2 Catalyst toward High-Performance Na-Ion Batteries

• DOI: 10.1021/acsami.4c02268
• Publication Date: 2024-04-05T15:41:06Z
• Authors: Wei-Huan He; Yu-Jie Guo; En-Hui Wang; Liang Ding; Xin Chang; Yu-Xin Chang; Zhou-Quan Lei; Sen Xin; Hui Li; Bo Wang; Qian-Yu Zhang; Li Xu; Ya-Xia Yin; Yu-Guo Guo
• Keywords: Boosting

The formation of a solid electrolyte interphase on carbon anodes causes irreversible loss Na+ ions, significantly compromising the energy density Na-ion full cells. Sodium compensation additives can effectively address sodium but suffer from high decomposition voltage induced by low electrochemical activity. Herein, we propose universal electrocatalytic strategy introducing nanotube (CNT)/MnO2 catalyst to realize utilization at much-reduced voltage. well-organized CNT/MnO2 composite with catalytic activity, good electronic conductivity, and abundant reaction sites enables decompose reduced voltages (from 4.40 3.90 V vs Na+/Na for oxalate, 3.88 carbonate, even 3.80 citrate). As result, oxalate as optimal additive achieves specific capacity 394 mAh g–1, almost reaching its theoretical in first charge, increasing cell 111 158 Wh kg–1 improved cycle stability rate capability. This work offers valuable approach enhance efficiency, promising high-performance storage devices future.