Carbon ( IF 10.5 ) Pub Date : 2022-02-21 , DOI: 10.1016/j.carbon.2022.02.022
Junjie Chen 1, 2 , Ting Wang 1 , Chen Chen 1 , Qiuyu Zhang 1, 2 , Baoliang Zhang 1, 3
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Hollow structure and heteroatom doping strategies are effective approaches to prepare high-performance energy storage materials. Herein, hollow precursors are obtained in a solvothermal reaction based on Ostwald-ripening process, time-tracking and variable-control methods are adopted to explore the formation mechanism and influencing factors of hollow precursors. Selenium-doped V2O3/carbon composites (VOSe) are prepared via the high-temperature selenization process. VOSe manifests abundant internal space and plentiful defects, which provides more adsorption sites for Na+/K+/Li+ and facilitates immersion of the electrolyte. Therefore, VOSe exhibits a higher capacity and excellent cycle stability for sodium storage (201.5 mA h/g after 2700 cycles at 3.0 A/g), potassium storage (162.3 mA h/g after 500 cycles at 0.5 A/g) and lithium storage (305 mA h/g at 5.0 A/g over 1000 cycles), Compared to V2O3/carbon composites (VO), kinetic analysis and DFT calculation indicate that VOSe possesses more rapid Na + diffusion kinetics and lower diffusion barrier. The reversible chemical transformation of Na++V2O3 α-NaVO3 and performance evolution are characterized via ex-situ analyses. Finally, full-cells assembled with Na3V2(PO4)3 cathode exhibits superior cycle stability (170.8 mA h/g after 150 cycles at 0.5 A/g).
中文翻译:
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杂原子掺杂空心氧化钒/碳复合材料作为高效碱金属离子存储的通用负极材料
空心结构和杂原子掺杂策略是制备高性能储能材料的有效途径。在此,基于Ostwald熟化工艺的溶剂热反应获得中空前驱体,采用时间跟踪和变量控制的方法探索中空前驱体的形成机理和影响因素。通过高温硒化工艺制备了硒掺杂的V 2 O 3 /碳复合材料(VO Se )。VO Se内部空间充裕,缺陷多,为Na + /K + /Li +提供了更多的吸附位点,有利于电解液的浸入。因此,VO Se对于钠存储(在 3.0 A/g 下 2700 次循环后为 201.5 mA h/g)、钾存储(在 0.5 A/g 下 500 次循环后为 162.3 mA h/g)和锂存储(305 mA)表现出更高的容量和出色的循环稳定性h/g at 5.0 A/g over 1000 cycles),与V 2 O 3 /碳复合材料(VO)相比,动力学分析和DFT计算表明VO Se具有更快的Na + 扩散动力学和更低的扩散势垒。Na + +V 2 O 3的可逆化学转变 通过异位分析表征α-NaVO 3和性能演变。最后,用 Na 3 V 2 (PO 4 ) 3正极组装的全电池表现出优异的循环稳定性(以 0.5 A/g 循环 150 次后为 170.8 mA h/g)。