Interlayer Engineering of MnO2 with High Charge Density Bi3+ for High Rate and Stable Aqueous Supercapacitor,Batteries & Supercaps

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Interlayer Engineering of MnO2 with High Charge Density Bi3+ for High Rate and Stable Aqueous Supercapacitor
Batteries & Supercaps ( IF 5.1 ) Pub Date : 2020-02-05 , DOI: 10.1002/batt.202000007
Ting Xiong _{1,

2} , Mingke Zhu ₁ , Yaoxin Zhang ₁ , Wee Siang Vincent Lee ₁ , Zhi Gen Yu ₃ , Junmin Xue ₁

Affiliation

Two‐dimensional δ‐MnO₂ has attracted considerable attention as supercapacitor electrode due to its ability to incorporate foreign ions into its interlayer spacing which suggests the possibility of capacitance enhancement through interlayer engineering. Incorporating high charge density cation such as Bi³⁺ into the MnO₂ interlayer becomes an attractive strategy that not only serves to stabilize the layer structure, it is also an important prelude towards the weakening of the chemical bonding between the O from MnO₂ and the intercalating electrolyte species. This in turn leads to higher reversibility while ensuring excellent structural stability that is portrayed in enhanced cyclic stability and rate performance. Herein, the Bi³⁺‐modified δ‐MnO₂ delivered a reversible specific capacity of 421 F g⁻¹ at 1 A g⁻¹, which is higher than that of the previously reported mono/divalent cation‐intercalant modified MnO₂ systems. Using the N‐doped carbon nanosheets as the negative electrode, the assembled asymmetric supercapacitor achieved a high capacitance of 77 F g⁻¹ at 1 Ag⁻¹. Furthermore, the high energy density of 20 Wh kg⁻¹ was recorded at a high‐power density of 39 kW kg⁻¹, while simultaneously demonstrating excellent cycle performance of 82 % capacitance retention after 40 000 cycles. This work has shown that interlayer engineering of layered MnO₂ could potentially provide new insight into the development of high‐performance supercapacitor electrode.

中文翻译：

高电荷密度稳定水超级电容器用高电荷密度Bi3 +的MnO2的层间工程

二维δ-的MnO ₂已引起相当大的关注作为超电容器电极，由于其掺入外来离子进入这表明电容增强通过层间工程的可能性其层间间隔的能力。掺入高电荷密度的阳离子，例如Bi ³⁺到的MnO ₂层间成为有吸引力的策略，不仅用于稳定层结构，它也是朝向-O之间的化学键合的减弱的重要从前奏的MnO ₂和嵌入电解质种类。这又导致更高的可逆性，同时确保了出色的结构稳定性，这表现为增强的循环稳定性和速率性能。在这里，毕³⁺改性δ-的MnO ₂提供的421 F G的可逆比容量^-1 1 A G ^-1，它比以前报道的单声道/二价阳离子插层改性的MnO更高₂系统。使用N掺杂的碳纳米片作为负极，组装后的不对称超级电容器在1 Ag ^-1处实现了77 F g ^-1的高电容。此外，在39 kW kg ^-1的高功率密度下记录到20 Wh kg ^-1的高能量密度，同时展示了4万次循环后82％电容保持率的出色循环性能。这项工作表明，层状MnO _2的层间工程可以为高性能超级电容器电极的开发提供新的见识。

更新日期：2020-02-05

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