Nanostructured BiS encapsulated within three-dimensional N-doped graphene as active and flexible anodes for sodium-ion batteries

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Nano Research, ISSN: 1998-0000, Vol: 11, Issue: 9, Page: 4614-4626

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Lu, Chen; Li, Zhenzhu; Yu, Lianghao; Zhang, Li; Xia, Zhou; Jiang, Tao; Yin, Wanjian; Dou, Shi Xue; Liu, Zhongfan; Sun, Jingyu
Springer Nature America, Inc
Materials Science; Engineering; Physical Sciences and Mathematics
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Sodium-ion batteries (SIBs) have been increasingly attracting attention as a sustainable alternative to lithium-ion batteries for scalable energy storage. The key to advanced SIBs relies heavily upon the development of reliable anodes. In this respect, BiS has been extensively investigated because of its high capacity, tailorable morphology, and low cost. However, the common practices of incorporating carbon species to enhance the electrical conductivity and accommodate the volume change of BiS anodes so as to boost their durability for Na storage have met with limited success. Herein, we report a simple method to realize the encapsulation of BiS nanorods within three-dimensional, nitrogen-doped graphene (3DNG) frameworks, targeting flexible and active composite anodes for SIBs. The BiS/3DNG composites displayed outstanding Na storage behavior with a high reversible capacity (649 mAh·g at 62.5 mA·g) and favorable durability (307 and 200 mAh·g after 100 cycles at 125 and 312.5 mA·g, respectively). In-depth characterization by in situ X-ray diffraction revealed that the intriguing Na storage process of BiS was based upon a reversible reaction. Furthermore, a full, flexible SIB cell with NaMnO cathode and as-prepared composite anode was successfully assembled, and holds a great promise for next-generation, wearable energy storage applications. [Figure not available: see fulltext.].