Xiaoqian He, Ruiqi Cheng, Xinyu Sun, Fengzhan Sun, Yang Fu, Yitong Li, Peng Li, Zhao Li, Hao Xu, Richard M. Laine, Jianxin Zou
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引用次数: 0
摘要
可充电镁离子电池(MIBs)在安全高效地大规模储能方面前景广阔,但高性能阴极的缺乏阻碍了其在实际应用中的发展。在这项研究中,我们通过溶解热合成了一系列由在 450 °C 下退火的π-共轭过烯-3,4,9,10-四羧酸二酐和硫化铜(CuSP)组成的纳米复合材料,以探索它们作为 MIB 中 Mg2+ 储存宿主的效用。混合材料中的羰基有机物改变了主要的 CuS 相,通过改变内部电场扩大了层间间距并丰富了硫空位。这种协同作用增强了镁的储存性能并加快了反应动力学。使用无氯 Mg[B(hfip)4]2/DME 电解质,含有适当有机成分的 CuSP91 阴极在 50 mA g-1 的条件下显示出 285 mAh g-1 的显著高可逆容量,在 100 mA g-1 的条件下显示出 220 mAh g-1 的稳定容量,在更短的活化时间方面超过了纯 CuS 阴极。CuSP91 阴极在 500 mA g-1 的条件下,经过 1000 次循环后仍能保持 55 mAh g-1 的放电容量。通过原位/离位调查和分析,揭示了一种共氧化还原机制。总之,这项研究为在下一代储能系统中开发先进的有机-无机混合阴极材料提供了宝贵的见解。
Organic Heterophase Composites Induced Sulfur Vacancies and Internal Electric Field Enhancement for Advanced Magnesium Storage of Copper Sulfide Cathodes
Rechargeable magnesium-ion batteries (MIBs) hold significant promise for safe and efficient large-scale energy storage, but the lack of high-performance cathodes hinders their development for practical applications. In this work, a series of nanocomposites consisting of π-conjugated perylene-3,4,9,10-tetracarboxylic dianhydride annealed at 450 °C and copper sulfide (CuSP) are synthesized solvothermally to explore their utility as a host for Mg2+ storage in MIBs. The carbonyl organics in the hybrid materials modify the predominant CuS phase, expanding interlayer spacing and enriching sulfur vacancies through modifications of the internal electric field. This synergistic interaction enhances magnesium storage performance and accelerates reaction kinetics. Using chlorine-free Mg[B(hfip)4]2/DME electrolytes, the CuSP91 cathode containing an appropriate organic content displays a remarkably high reversible capacity of 285 mAh g−1 at 50 mA g−1, and demonstrates a stable capacity of 220 mAh g−1 at 100 mA g−1, surpassing pure CuS cathode in terms of shorter activation time. The CuSP91 cathode maintains a discharge capacity of 55 mAh g−1 over 1000 cycles at 500 mA g−1. A co-redox mechanism is revealed through in/ex situ investigations and analyses. Overall, this research contributes valuable insights targeting the development of advanced organic–inorganic hybrid composite cathode materials in next-generation energy storage systems.
期刊介绍:
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