Wang Weiwei, Zhang Chi, Chen Zhengfan, Huang Rui, Nie Yanmei, Liu Penggao, Liu Kaiyu, Yan Jun
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, P. R. China.
Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Changsha 410083, Hunan, P. R. China.
Dalton Trans. 2022 Jun 21;51(24):9477-9485. doi: 10.1039/d2dt00989g.
Aqueous Zn-ion batteries (ZIBs) show great potential in energy storage systems because of their high theoretical capacities, high safety, low cost, and environmental friendliness. The lack of suitable cathode materials for sustaining the Zn intercalation/deintercalation severely restricts their further application. Herein, calcium-intercalated birnessite MnO anchored on carbon nanotubes (CNTs) was designed as a cathode for ZIBs. The cathode material can be facilely produced by a simple one-pot reaction process. The external calcium-intercalated MnO with large layer spacing affords a fast ionic migration rate and the internal CNTs serving as a structural framework endow the electrode with better electrical conductivity. Benefiting from the larger interlayer spacing and the enhanced electrical conductivity, the CNT-CaMO cathode shows a high specific capacity of 351.8 mA h g at 200 mA g and a long cycle life over 6000 cycles. Besides, the H and Zn co-intercalation storage mechanism was confirmed by XRD, SEM, and XPS analyses. This work opens up a new way to develop aqueous ZIB cathode materials with a high reversible capacity and long cycle life.
水系锌离子电池（ZIBs）因其高理论容量、高安全性、低成本和环境友好性，在储能系统中显示出巨大潜力。缺乏合适的阴极材料来维持锌离子的嵌入/脱嵌严重限制了它们的进一步应用。在此，锚定在碳纳米管（CNTs）上的钙插层水钠锰矿MnO被设计为ZIBs的阴极。该阴极材料可通过简单的一锅法反应过程轻松制备。具有大层间距的外部钙插层MnO提供了快速的离子迁移速率，而作为结构框架的内部CNTs赋予电极更好的导电性。受益于更大的层间距和增强的导电性，CNT-CaMO阴极在200 mA g下显示出351.8 mA h g的高比容量和超过6000次循环的长循环寿命。此外，通过XRD、SEM和XPS分析证实了H和Zn共嵌入存储机制。这项工作为开发具有高可逆容量和长循环寿命的水系ZIB阴极材料开辟了一条新途径。
