From agaric hydrogel to nitrogen-doped 3D porous carbon for high-performance Li–S batteries

Gu, Xingxing, Li, Hui, Wen, Hongyu, Zhou, Yanjun, Kang, Han, Liao, Hu, Gao, Maohua, Wang, Yueqin, Deng, Lan, Yi, Xinxin and Liu, Xiaoteng (2020) From agaric hydrogel to nitrogen-doped 3D porous carbon for high-performance Li–S batteries. Journal of Materials Science, 55 (3). pp. 1136-1147. ISSN 0022-2461

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Reproducible massive biochar with low cost has attracted great attentions due to their potential applications in the future environment and energy. In this work, a nitrogen-doped 3D porous agaric carbon (N-AC) with high specific surface area (1568.2 m2 g−1) was fabricated without adding any activator by using the agaric hydrogel as a precursor. And when employed as a sulfur host, the resulted N-AC–sulfur composite electrode with 60 wt% sulfur content illustrates a high reversible capacity of 875 mAh g−1 at 0.2 C (1 C = 1675 mA g−1) over 100 cycles as well as an excellent rate capability of 620 mAh g−1 at 2 C. Such excellent electrochemical performances could attribute to (1) the conductive carbon skeleton of N-AC that provides rapid electron/ion transfer; (2) abundant pores range from micropores to macropores in N-AC that are beneficial to accommodating the active sulfur and polysulfides and (3) the nitrogen dopants that provide polarized sites in chemical binding of polysulfides. In a word, this work provides a compelling avenue to the design of multifunctional sulfur host for advanced Li–S batteries.

Item Type: Article
Subjects: F200 Materials Science
H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Elena Carlaw
Date Deposited: 31 Oct 2019 14:36
Last Modified: 31 Oct 2019 14:36

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