限制在介孔碳微球中的纳米结构 MnO2 作为高性能超级电容器和锂离子电容器的双功能电极,Industrial & Engineering Chemistry Research

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限制在介孔碳微球中的纳米结构 MnO2 作为高性能超级电容器和锂离子电容器的双功能电极
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-01-19 , DOI: 10.1021/acs.iecr.1c04475
Qizhi Liu ₁ , Cheng Ma ₁ , Wenming Qiao _{1,

2} , Licheng Ling _{1,

2} , Jitong Wang _{1,

2}

Affiliation

二氧化锰（MnO ₂）是获得高赝电容和比容量的优秀电极材料，但充放电过程中的结构粉化和导电性差是不可避免的问题。将纳米级MnO ₂限制在介孔碳球的稳定孔道中，可以有效抑制其粉化，获得优良的导电网络。在此，通过精心设计的简单策略，包括喷雾干燥和随后的氧化还原反应，制备了纳米结构的 MnO ₂ /介孔碳微球 (MCM) 作为超级电容器和锂离子电容器 (LIC) 的双功能电极。MnO ₂ /MCMs 电极提供 188 F g 的重量电容^–1和 347 F cm ^{–3的体积电容，在 1 A g}^–1下 1000 次循环后具有出色的循环性能，即 90% 的电容保持率，是超级电容器的理想选择。此外，组装的 MnO ₂ /MCMs//活性炭 (AC) 锂离子电容器具有 1300 次的长循环寿命，在 1 A g ^-1时容量损失为 7.7% ，能量密度高达 147 Wh kg ^-1，以及 4952 W kg ^–1的功率密度，证明了其在 LIC 阳极上的可行性。优异的电化学性能归因于 MnO _{2之间的协同作用}和介孔碳微球，提高了两个系统的电化学容量和循环稳定性。这项工作为将双功能MnO ₂ /MCMs用作高效混合系统的电极材料提供了可能性。

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Nanoarchitectured MnO2 Confined to Mesoporous Carbon Microspheres as Bifunctional Electrodes for High-Performance Supercapacitors and Lithium-Ion Capacitors

Manganese dioxide (MnO₂) is an outstanding electrode material to obtain high pseudocapacitance and specific capacity, but the structure pulverization and poor conductivity during the charge/discharge process are the inevitable problems. Restricting nanoscaled MnO₂ in stable pore channels of mesoporous carbon spheres can effectively inhibit its pulverization and obtain an excellent conductive network. Herein, nanoarchitectured MnO₂/mesoporous carbon microspheres (MCMs) as bifunctional electrodes for supercapacitors and lithium-ion capacitors (LICs) were prepared through a charily designed facile stratagem containing spray drying and the subsequent redox reaction. The MnO₂/MCMs electrode delivers a gravimetric capacitance of 188 F g^–1 and a volumetric capacitance of 347 F cm^–3 with an outstanding cyclic performance of 90% capacitance retention after 1000 cycles at 1 A g^–1, which is ideal for supercapacitors. Moreover, the assembled MnO₂/MCMs//activated carbon (AC) lithium-ion capacitors exhibit a long cyclic life of 1300 times with 7.7% capacity loss at 1 A g^–1 and a superior energy density of 147 Wh kg^–1, as well as a power density of 4952 W kg^–1, demonstrating its feasibility on LIC anodes. The excellent electrochemical performance is ascribed to the synergistic effect between MnO₂ and mesoporous carbon microspheres, which improves the electrochemical capacities and cyclic stability of both systems. This work provides the possibility for applying bifunctional MnO₂/MCMs as electrode materials for high-efficiency hybrid systems.

更新日期：2022-02-02

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