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

Xingxing Gu*, Hui Li, Hongyu Wen, Yanjun Zhou, Han Kang, Hu Liao, Maohua Gao, Yueqin Wang, Lan Deng, Xinxin Yi, Xiaoteng Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1136–1147
JournalJournal of Materials Science
Volume55
Issue number3
Early online date11 Sep 2019
DOIs
Publication statusPublished - 1 Jan 2020

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