S-Doped N-Rich Carbon Nanosheets with Expanded Interlayer Distance as Anode Materials for Sodium-Ion Batteries.

Yang, Jiqian; Zhou, Xianlong; Wu, Dihua; Zhao, Xudong; Zhou, Zhen · Adv Mater · 2017

basic_science · Level V

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Abstract

2D composites with S doping into N-rich carbon nanosheets are fabricated, whose interlayer distance becomes large enough for Na<sup>+</sup> insertion and diffusion. The large surface area and stable structure also provide more sites for Na<sup>+</sup> adsorption, leading to high Na-storage capacity and excellent rate performance. Moreover, Faradaic reactions between Na<sup>+</sup> and tightly bound S is beneficial for further improvement of Na-storage capacity.