Affiliation:
1. School of Materials Science and Engineering Southeast University Nanjing Jiangsu 211189 P. R. China
2. Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei Anhui 230026 P. R. China
3. Department of Chemistry University College London London WC1H 0AJ UK
Abstract
AbstractConversion/alloying‐type anodes are drawing attention due to their high theoretical capacities, but inferior reversibility, especially under low current densities, has hampered potential applications. Conventional strategies mainly focus on conversion/alloying processes, whereas the intercalation process is rarely analyzed. Herein, the intercalation process is correlated with conversion/alloying processes by ion dispersion states. BiOCl/Ti3C2Tx MXene van der Waals heterostructure is selected as a proof‐of‐concept system. Multifunctional MXenes not only contribute to atomic dispersion and boosted ion diffusion at the first cycle by constructing a novel heterostructure but serve as supporting frameworks to sustain long‐term structural stability. Consequently, a cell with BiOCl/MXene anode delivers an ultralong cycle‐life of running over ten months, maintaining a high capacity of 225 mAh g−1 over 1300 cycles at 100 mA g−1 and a retention of 81.3%. These findings verify that enhanced initial intercalation can facilitate higher reversibility and shed light on developing high‐performance conversion/alloying‐type anodes.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Natural Science Foundation of Jiangsu Province
China Scholarship Council
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
3 articles.
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