Journal
JOURNAL OF MATERIALS SCIENCE
Volume 55, Issue 3, Pages 1136-1147Publisher
SPRINGER
DOI: 10.1007/s10853-019-03999-3
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Funding
- National Natural Science Foundation of China [51902036, 51808080]
- Natural Science Foundation of Chongqing Science & Technology Commission [cstc2019jcyj-msxm1407]
- Venture & Innovation Support Program for Chongqing Overseas Returnees [CX2018129]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201800808]
- Start-up Foundation of High-level Talents in Chongqing Technology and Business University [1856008]
- Open Research Fund of Chongqing Key Laboratory of Catalysis and New Environmental Materials [KFJJ2018082]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/S032886/1]
- EPSRC [EP/S032886/1] Funding Source: UKRI
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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 m(2) 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.
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