氮掺杂空心碳球锌离子混合电容器正极材料的制备及其性能

Preparation and properties of nitrogen-doped hollow carbon spheres cathode material for zinc-ion hybrid capacitor

以溶胶-凝胶法合成的二氧化硅球为模板,酚醛树脂为前驱体,采用模板法制备了氮掺杂空心碳球,并将其用作锌离子混合电容器正极材料。该空心碳球具有空腔结构的微观形貌和介孔主导的分级孔道,且碳壁相互连接,有效促进了离子传输扩散和提高了材料的电子导电性。研究表明:在电化学性能方面,原位氮掺杂极大地改善了电极材料的电解液浸润性和电子导电性,并提供更多的赝电容容量,从而全面提升了电极材料的性能。在0.2 A·g^(-1)电流密度下,其比容量可以达到147.8 mAh·g^(-1),经过20000次循环后容量保持率为82%,展现出良好的倍率性能和循环稳定性。因此,氮掺杂空心碳球有望成为下一代高性能锌离子混合电容器正极材料。

Nitrogen-doped hollow carbon spheres(NIHCSs)materials were prepared using a template method with phenolic resin as the precursor and sol-gel derived silica spheres as the template,and they were used as the cathode materials for zincion hybrid capacitors.The resulting hollow carbon spheres exhibited an unique nano-cavity structure,a carbon wall interconnection structure,and mesoporous dominated hierarchical channels which can effectively facilitate the ion diffusion and improve the electronic conductivity.The results show that the boosted electrolyte wettability,electronic conductivity,and pseudocapacitance of the electrode materials can be achieved by in-situ nitrogen doping.The capacity of zinc-ion hybrid capacitor with NIHCSs reaches 147.8 mAh·g^(-1) at 0.2 A·g^(-1),and the capacity retention ratio exceeds 82%after 20000 cycles.The excellent rate capacity and high cycle stability results indicate that NIHCSs can be utilized as the promising cathode materials for high-performance zinc-ion hybrid capacitors.