材料科学
异质结
化学工程
阳极
碳纤维
相(物质)
双金属
兴奋剂
纳米技术
复合数
电极
复合材料
光电子学
化学
物理化学
有机化学
工程类
作者
Yi Qu,Feng Wu,Zhengqing Ye,Yaozong Zhou,Yan Chen,Yixin Zhang,Zekai Lv,Li Li,Man Xie,Renjie Chen
标识
DOI:10.1016/j.cej.2022.138430
摘要
Two-phase or multiphase engineering is contributed to realizing rapid electron/ion transfer kinetics for transition metal tellurides in sodium-ion batteries (SIBs). However, the large volume variation and fundamental storage mechanism of these materials remain unsolved. Herein, petal-like N-doped carbon-confined CoTe2-ZnTe heterostructures (CoZn-Te/NC) are fabricated as anodes in SIBs via a facile bimetal-organic framework-derived strategy. Benefiting from the abundant phase interfaces and dual-defective sites, CoZn-Te/NC composites have fast electrons/ions diffusion and superior pseudocapacitive property. Particularly, introducing a petal-like nitrogen-doped carbon inhibits the particle agglomeration and alleviates volume expansion, thus improving structural stability during cycling. The CoZn-Te/NC exhibits a superior rate capacity of 106 mAh/g at 10 A g−1 and a high reversible capacity of 150 mAh/g at 1.0 A g−1 over 600 long-term cycles. The unique conversion and alloying/de-alloying reaction mechanisms of CoZn-Te/NC are revealed by the in-situ and ex-situ techniques. This work gives promising insights for designing high-performance electrode materials by phase interface, doping, and confining strategy.
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