3D hierarchical MnO2 microspheres: a prospective material for high performance supercapacitors and lithium-ion batteries,Sustainable Energy & Fuels

当前位置： X-MOL 学术 › Sustain. Energy Fuels › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

3D hierarchical MnO2 microspheres: a prospective material for high performance supercapacitors and lithium-ion batteries
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2017-08-21 00:00:00 , DOI: 10.1039/c7se00317j
Syed Khalid _{1,

2,

3,

4,

5} , Chuanbao Cao _{1,

2,

3,

4,

5} , Muhammad Naveed _{1,

2,

3,

4,

5} , Waqar Younas _{1,

2,

3,

4,

5}

Affiliation

3D hierarchical MnO₂ microspheres with an ultrathin nanosheet structure and high specific surface area (184.32 m² g⁻¹) are synthesized by a rapid microwave heating method in just 10 minutes. In this work, an ionic electrolyte (EMIMBF₄/DMF) based asymmetric supercapacitor device is successfully prepared by using 3D hierarchical MnO₂ microspheres as the cathode and activated carbon as the anode material. The (EMIMBF₄/DMF) electrolyte enables a significant enhancement in the potential windows of individual electrode materials and the asymmetric device which results in much improved electrochemical performance. The asymmetric device operates successfully within a potential window of 3.0 V and exhibits an outstanding energy density of 105 W h kg⁻¹ at a power density of 1494 W kg⁻¹ with good cycling life stability (20% loss after 6000 cycles) at a much higher current density of 6 A g⁻¹. Moreover, 3D hierarchical MnO₂ microspheres also exhibit an outstanding Li ion storage performance with a discharge capacity of 715 mA h g⁻¹ even after 200 cycles at a current density of 300 mA g⁻¹. The discharge capacity retention (78% @ the 2nd cycle) after 200 cycles at 300 mA g⁻¹ is the highest amongst those of all the reported anode materials based on MnO₂. High specific capacities and outstanding cyclability further indicate their strong potential as an anode material for lithium-ion batteries. The promising energy storage applications can be ascribed to the high specific surface area, mesoporous structure and ultrathin nanosheet building blocks of MnO₂ microspheres.

中文翻译：

3D分层MnO ₂微球：高性能超级电容器和锂离子电池的潜在材料

通过快速微波加热法在短短10分钟内合成具有超薄纳米片结构和高比表面积（184.32 m ² g ^-1）的3D分层MnO ₂微球。在这项工作中，通过使用3D分层MnO ₂微球作为阴极并使用活性炭作为阳极材料成功地制备了基于离子电解质（EMIMBF ₄ / DMF）的不对称超级电容器。（EMIMBF ₄/ DMF）电解质可以显着提高单个电极材料和非对称器件的电势窗口，从而大大改善电化学性能。该非对称器件在3.0 V的电势窗口内成功运行，并在功率密度为1494 W kg ^{-1的情况下}表现出出色的能量密度为105 W h kg ^-1，并且在室温下具有良好的循环寿命稳定性（6000次循环后损耗20％）。 6 A g ^-1更高的电流密度。此外，三维分层的MnO _2分的微球也与715毫安Hg的放电容量显示出杰出的Li离子储存性能^-1即使在300毫安g的电流密度200个循环^-1。在所有报告的基于MnO _2的负极材料中，放电循环后在300 mA g ^-1下200次循环后的放电容量保持率（第二循环中为78％）是最高的。高比容量和出色的可循环性进一步表明了它们作为锂离子电池负极材料的强大潜力。MnO ₂微球的高比表面积，中孔结构和超薄纳米片构造块可归因于有前途的储能应用。

更新日期：2017-09-06

点击分享查看原文

点击收藏

阅读更多本刊最新论文