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Integrating anti-aggregation Ta-Se motifs into copper selenide for fast and robust sodium-ion storage
Yiran Hao1,2, Zhuoran Lv3, Wujie Dong3
1State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, P. R. China. qinpeng@mail.sic.ac.cn.
Abstract:
We report a novel bimetallic selenide Cu3TaSe4 anode for sodium-ion batteries synthesized via a one-step solid-state method. The integration of Ta-Se motifs into copper selenide forms a cubic grid structure that prevents copper atom aggregation and mitigates electrode failure. Cu3TaSe4 exhibits a high specific capacity of 305 mAh g-1 at 1 C, excellent rate performance of 286 mAh g-1 at 50 C, and superior cycling stability with 272 mAh g-1 after 3500 cycles at 20 C. This work demonstrates the potential of bimetallic selenides in enhancing sodium-ion battery performance.
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