Sang Zhiyuan, Yan Xiao, Su Dong, Ji Huiming, Wang Sihui, Dou Shi Xue, Liang Ji
Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education, School of Materials Science and Engineering, Tianjin University, Tianjin, 300350, China.
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, China.
Small. 2020 Jun;16(25):e2001265. doi: 10.1002/smll.202001265. Epub 2020 May 20.
The design and construction of flexible electrodes that can function at high rates and high areal capacities are essential regarding the practical application of flexible sodium-ion batteries (SIBs) and other energy storage devices, which remains significantly challenging by far. Herein, a flexible and 3D porous graphene nanosheet/SnS (3D-GNS/SnS ) film is reported as a high-performance SIB electrode. In this hybrid film, the GNS/SnS microblocks serve as pillars to assemble into a 3D porous and interconnected framework, enabling fast electron/ion transport; while the GNS bridges the GNS/SnS microblocks into a flexible framework to provide satisfactorily mechanical strength and long-range conductivity. Moreover, the SnS nanocrystals, which chemically bond with GNS, provide sufficient active sites for Na storage and ensure the cycling stability. Consequently, this flexible 3D-GNS/SnS film exhibits excellent Na-storage performances, especially in terms of high areal capacity (2.45 mAh cm ) and high rates with superior stability (385 mAh g at 1.0 A g over 1000 cycles with ≈100% retention). A flexible SIB full cell using this anode exhibits high and stable performance under various bending situations. Thus, this work provide a feasible route to prepare flexible electrodes with high practical viability for not only SIBs but also other energy storage devices.
对于柔性钠离子电池（SIBs）和其他储能设备的实际应用而言，能够在高倍率和高面积容量下工作的柔性电极的设计与构建至关重要，而到目前为止这仍然具有巨大的挑战性。在此，报道了一种柔性三维多孔石墨烯纳米片/SnS（3D-GNS/SnS）薄膜作为高性能SIB电极。在这种复合薄膜中，GNS/SnS微块作为支柱组装成三维多孔且相互连接的框架，实现快速的电子/离子传输；而GNS将GNS/SnS微块连接成一个柔性框架，以提供令人满意的机械强度和长程导电性。此外，与GNS化学键合的SnS纳米晶体为钠存储提供了足够的活性位点，并确保了循环稳定性。因此，这种柔性3D-GNS/SnS薄膜表现出优异的钠存储性能，特别是在高面积容量（2.45 mAh cm）和高倍率下具有卓越的稳定性（在1.0 A g下循环1000次，容量为385 mAh g，保留率约为100%）。使用这种阳极的柔性SIB全电池在各种弯曲情况下都表现出高且稳定的性能。因此，这项工作为制备不仅对SIBs而且对其他储能设备具有高实际可行性的柔性电极提供了一条可行的途径。
