Wafer-biscuits-like few-graphene-layers carbon with N, P, S triple-doping for efficient and stable sodium-ion storage. (10th February 2023)

• Record Type: Journal Article
• Authors: Shi, Yongzheng; Li, Hong-Ji; Yuan, Xue; Bai, Wen-hui; Lyu, Xue-Feng; Zhu, Li-Jun; Jiang, Fei; Chen, Yi-Qian; Chen, Zhe
• Is Part Of: Electrochimica acta. Volume 441(2023)
• Publication Date: 2023-02-10
• Subjects: Sodium-ion batteries -- Triple-heteroatom doping -- Few-graphene-layers carbon -- Expanded interlayer spacing -- Anti-agglomeration; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2022.141813
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: N, P, S doped few-graphene-layers carbon is fabricated via a template approach. The triple-doped carbon has a wafer-biscuit-like structure to prevent agglomeration. Wafer-biscuit-like carbon anode exhibits improved electrochemical performances. Sodium storage mechanism of the wafer-biscuit-like carbon anode has been explored. Abstract: Carbon-based materials are one of the most attractive anodes for sodium-ion batteries because of their wide availability, facile synthesis, and low cost. However, rational designing carbon-based architecture towards upgrading the electrochemical performance of anodes for sodium storage has been a great challenge. Herein, we prepared N, P, S triple-doped few-graphene-layers carbon with expanded interlayer spacing via a scalable template approach. The few-graphene-layers carbon negatively replicates the structure of the layered template to generate a wafer-biscuit-like architecture, which prevents the restack of carbon nanosheets. The interlayer spacing and heteroatom contents of wafer-biscuit-like carbon architecture can be modulated by varying carbonization temperatures. Consequently, the optimum carbon anode delivers a high reversible capacity of 329 mAh g − 1, good rate capability, and long-term stability of 300 cycles at 1 A g − 1 . Furthermore, the sodium storage mechanism of wafer-biscuit-like carbon anodes has been systematically explored. Graphical abstract: Wafer-biscuits-like few-graphene-layers carbon with N, P, S triple-doping and expanded interlayer spacing has been fabricated via a hard template approach using a polymer as the precursor and a layered silicate as the hard template. The unique carbon anode exhibits upgraded electrochemical performances and fast kinetic processes of sodium storage compared to many non-templated carbon anodes. Image, graphical abstract