Licari Adrián, Benítez Almudena, Gómez-Cámer Juan Luis, Trócoli Rafael, Caballero Álvaro
Departamento de Química Inorgánica e Ingeniería Química, Instituto Químico para la Energía y el Medioambiente (IQUEMA), Facultad de Ciencias, Universidad de Córdoba, 14071 Córdoba, Spain.
Nanomaterials (Basel). 2024 Mar 8;14(6):489. doi: 10.3390/nano14060489.
Lithium-sulphur (Li-S) batteries offer high energy density compared to lithium-ion batteries, emerging as a promising technology for the next generation of energy storage systems. The ongoing challenge is to improve their electrochemical performance, extend their useful life and mitigate some problems that persist in this technology, by the investigation in materials with diverse properties. This work seeks to elucidate the importance and repercussions associated with functionalisation of graphene-based materials through nitrogen incorporation (more than 9 wt.% N), employing different chemical agents such as ethylenediamine and ammonia. Herein, differences in both the textural properties and the chemical environment of nitrogen within the carbonaceous network are identified, resulting in distinct electrochemical behaviours. The electrochemical performance of electrodes prepared from ammonia-functionalised samples surpasses that of ethylenediamine-functionalised samples in terms of both efficiency and rate performance. Conversely, the ethylenediamine-functionalised samples excel in stability, showing exceptional values in capacity retention per cycle. The outcomes exceeded expectations in energy performance, allowing the Li-S cells to be subjected to ultra-high rate cycling while maintaining appropriate capacity values.
与锂离子电池相比，锂硫（Li-S）电池具有更高的能量密度，正成为下一代储能系统的一项有前景的技术。当前的挑战是通过对具有不同性质的材料进行研究，来改善其电化学性能、延长其使用寿命并缓解该技术中仍然存在的一些问题。这项工作旨在阐明通过引入氮（氮含量超过9 wt.%）对基于石墨烯的材料进行功能化处理的重要性和影响，采用了乙二胺和氨等不同的化学试剂。在此，确定了碳质网络内结构性质和氮的化学环境的差异，从而导致不同的电化学行为。就效率和倍率性能而言，由氨功能化样品制备的电极的电化学性能超过了乙二胺功能化样品。相反，乙二胺功能化样品在稳定性方面表现出色，在每个循环的容量保持率方面显示出优异的值。能量性能方面的结果超出了预期，使锂硫电池能够在保持适当容量值的同时进行超高速率循环。
