煤沥青基多孔炭在超级电容器中的应用进展

Progress in application of coal pitch-based porous carbon in supercapacitors

  • 摘要: 煤沥青作为煤热转化的衍生物不仅含碳量高、成本低且产量大,为煤沥青基多孔炭电极的研发提供了广阔前景,有望破解目前超级电容器投资成本高、大规模生产难的困境。综述了煤沥青基多孔炭电极材料的制备方法和性能提升策略及其在超级电容器领域中的应用,为利用煤沥青开发低成本且性能优异的超级电容器电极材料提供参考。首先介绍了超级电容器的能量储存机制,并列举了影响超级电容器多孔炭材料电化学性能的结构因素及规律,总结了评价超级电容器电化学性能的关键性能指标,为后续的煤沥青基多孔炭电极材料的设计和性能优化提供理论基础,并进一步说明了煤沥青基多孔炭在超级电容器领域应用的优势。随后详尽讨论了基于活化法、模板法及熔盐法等方法制备煤沥青基多孔炭的特点与进展;在此基础上,进一步全面梳理了孔隙结构调整、形貌设计、表面化学性质调控、过渡金属化合物复合等策略在提升煤沥青基多孔炭电极材料电化学性能方面的重要作用,重点突出了组分分离和氧化修饰策略对煤沥青多孔炭孔隙调控的优势,并基于多维碳材料工程的新理念和煤沥青基多孔炭与过渡金属化合物复合材料的耦合机制,讨论了目前煤沥青基多孔炭面临的前驱体分子复杂、可控度低、合成过程有待优化的问题。最后,聚焦于煤沥青多孔炭在超级电容器规模化应用中亟待解决的瓶颈问题,结合不同改性策略对其未来发展前景进行了展望。

     

    Abstract: Coal pitch as a derivative of coal thermal conversion not only contains high carbon content, low cost and large production, which provides a broad prospect for the research and development of coal pitch-based porous carbon electrodes, and is expected to crack the current dilemma of the high investment cost and difficulty of large-scale production of supercapacitors. The preparation methods and performance enhancement strategies of coal pitch-based porous carbon electrode materials and their applications in the field of supercapacitors are summarized to provide a reference for the development of low-cost and high-performance supercapacitor electrode materials using coal pitch. Firstly, the energy storage mechanism of supercapacitors is introduced and the structural factors and laws affecting the electrochemical performance of supercapacitor porous carbon materials are listed, and the key performance indexes for evaluating the electrochemical performance of supercapacitors are summarized, which provide a theoretical basis for the subsequent design and performance optimization of coal pitch-based porous carbon electrode materials, and further illustrate the advantages of the application of coal pitch-based porous carbon in the field of supercapacitors. Subsequently, the characteristics and progress of the preparation of coal pitch-based porous carbon based on the activation method, template method and molten salt method are discussed in detail; on this basis, the important roles of the strategies of pore structure adjustment, morphology design, modulation of surface chemistry, and complexation of transition metal compounds in enhancing the electrochemical performance of coal pitch-based porous carbon electrode materials are further comprehensively sorted out, and the effects of the strategies of component separation and oxidative modification on the pore space of coal pitch-based porous carbon electrode materials are highlighted. The advantages of component separation and oxidative modification strategies on the pore regulation of coal pitch porous carbon are highlighted, and based on the new concept of multidimensional carbon materials engineering and the coupling mechanism of coal pitch porous carbon and transition metal compound composites, the problems faced by coal pitch porous carbon at present, such as the complexity of the precursor molecules, the low controllability, and the synthesis process to be optimized, are discussed. Finally, focusing on the bottlenecks that need to be solved in the large-scale application of coal pitch-based porous carbon in supercapacitors, the future development prospects of coal pitch-based porous carbon are discussed in the light of different modification strategies.

     

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