Biswas Sudipta, Mandal Debabrata, Singh Trilok, Chandra Amreesh
Department of Physics, Indian Institute of Technology Kharagpur Kharagpur-721302 India
School of Nano Science and Technology, Indian Institute of Technology Kharagpur Kharagpur-721302 India.
RSC Adv. 2021 Sep 8;11(48):30031-30039. doi: 10.1039/d1ra05474k. eCollection 2021 Sep 6.
Recent trends in sodium-ion-based energy storage devices have shown the potential use of hollow structures as an electrode material to improve the performance of these storage systems. It is shown that, in addition to the use of hierarchical structures, the choice of the complementary carbon electrode determines the final performance of Na-ion-based devices. Here, we present simple synthesis strategies to prepare different structured carbonaceous materials that can be upscaled to an industrial level. Individual carbon materials deliver specific capacitance ranges from 120 to 220 F g at a current density of 1 A g (with excellent capacity retention). These structures, when combined with hollow NaFePO microspheres to fabricate an aqueous supercapacitor, show as high as a 1.7 V working potential window and can deliver a maximum energy density of 25.29 W h kg capacity retention. These values are much higher than those reported by NaFePO solid particles and randomly chosen carbon structure-based supercapacitors.
基于钠离子的储能装置的最新趋势表明，空心结构作为电极材料具有提高这些储能系统性能的潜在用途。结果表明，除了使用分级结构外，互补碳电极的选择决定了基于钠离子的装置的最终性能。在此，我们提出了简单的合成策略来制备不同结构的碳质材料，这些材料可以扩大规模至工业水平。在1 A g的电流密度下，单个碳材料的比电容范围为120至220 F g（具有出色的容量保持率）。这些结构与空心NaFePO微球结合制备水系超级电容器时，显示出高达1.7 V的工作电位窗口，并且在容量保持率方面可以提供25.29 W h kg的最大能量密度。这些值远高于NaFePO固体颗粒和随机选择的基于碳结构的超级电容器所报告的值。
