| Autor: |
Liu, Dejian, Zhong, Jiarui, Cai, Zhiyi, Zhan, Zijian, Zheng, Cheng, Huang, Shaoming |
| Zdroj: |
ACS Applied Materials & Interfaces; October 2024, Vol. 16 Issue: 42 p57180-57189, 10p |
| Abstrakt: |
SnSe2has attracted great attention due to its unique 2D-layered structure, which makes it capable of sodium ion storage and higher theoretical capacities compared to traditional anode materials like hard carbon for sodium ion batteries (SIBs). However, SnSe2-based materials will cause structural damage due to volume expansion during ion storage, leading to poor cycle stability and rate capacity. In this work, Co-doped SnSe2(Co-SnSe2) with preferred crystal orientation was fabricated by a one-step solvothermal method. It has been found that after doping Co, the lower (001) crystal plane located at 14.4° replaced the higher (101) plane at 30.7° as the dominant crystal plane in Co-SnSe2, which significantly promoted ion diffusion and enhanced the pseudocapacitance behavior. Therefore, this Co-SnSe2anode achieves a high capacity of 504 mAh g–1at 1 A g–1, and a high-rate cycle stability, delivering a reversible capacity of 302 mAh g–1at 5 A g–1after 1800 cycles with a retained capacity rate of 94%. Moreover, the Na3V2(PO4)3||Co-SnSe2full cell exhibits a stable cycle performance of over 300 cycles at 1 A g–1, demonstrating great promise for practical applications. This work provides an effective reference for the exploration of high-performance sodium storage anode materials. |
| Databáze: |
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