Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 27, Pages 17253-17259Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04355
Keywords
nitrogen-enriched carbon; low temperature; polysulfide immobilization; surface chemistry; Li-S cathodes
Funding
- National Natural Science Foundation of China [21503250]
- Chinese Academy of Sciences
- CAS Key Laboratory of Biobased Materials of Qingdao Institute of Bioenergy and Bioprocess Technology
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Despite the increased attention devoted to exploring cathode construction based on various nitrogen enriched carbon scaffolds at room temperature, the low temperature behaviors of Li-S cathodes have yet to be studied. Herein, we demonstrate the good low-temperature electrochemical performances of nitrogen-enriched carbon/sulfur composite cathodes. Electrochemical evaluation indicates that a reversible capacity of 368 mAh g(-1) (0.5 C) over 100 cycles is achieved at -20 degrees C. After returning to 25 degrees C, a capacity of 620 mAh g(-1) (0.5 C) is achieved over 350 cycles with a low-capacity attenuation rate (0.071% per cycle) and an initial capacity of 1151 mAh g(-1) (0.1C). This positive electrochemical property was speculated to result from the good surface chemistry of the various amine groups in the nitrogen-enriched carbon materials with enhanced polysulfide immobilization.
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