材料科学
碳纳米管
阴极
结晶度
化学工程
电化学
无定形固体
集电器
电极
纳米技术
水溶液
复合材料
有机化学
复合数
电气工程
工程类
物理化学
化学
电解质
作者
Songshan Bi,Yizeng Wu,Anyuan Cao,Jin‐Lei Tian,Shoumin Zhang,Zhiqiang Niu
标识
DOI:10.1016/j.mtener.2020.100548
摘要
Rechargeable aqueous zinc-ion batteries (ZIBs) have gained particular attention in recent years because of their low cost and high safety. However, most of their performances are limited by unsatisfied architecture of cathodes. In addition, the degree of crystallinity of active materials also plays an important role in their electrochemical performance. Herein, we fabricated free-standing composite films with amorphous MnO2 (a-MnO2) and carbon nanotubes (CNTs) by an in situ deposition method. The free-standing a-MnO2@CNTs composite films can directly serve as the cathodes of ZIBs without binder and current collector. The resultant cathode exhibits highly electrical conductivity and fast ion-diffusion because of the corporation of interconnected three-dimensional CNTs architectures and ultra-thin a-MnO2 nanosheets. As a result, the resultant ZIB displays high energy and power density, as well as stable cycling performance. Moreover, based on composite films, flexible ZIBs were constructed, and they could remain stable electrochemical performance under different bending states, which have great potential for the application in flexible and wearable electronics.
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