Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 138, Issue 51, Pages 16576-16579Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08685
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Funding
- Australian Research Council (ARC) [LP120200432, DP140104062]
- Commonwealth of Australia through the Automotive Australia 2020 Cooperative Research Centre (Auto CRC)
- ARC [LE0882813, LE0237478]
- National Natural Science Foundation (NSF) of China [21210004]
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Despite the high theoretical capacity of the sodium-sulfur battery, its application is seriously restrained by the challenges due to its low sulfur electroactivity and accelerated shuttle effect, which lead to low accessible capacity and fast decay. Herein, an elaborate carbon framework, interconnected mesoporous hollow carbon nanospheres, is reported as an effective sulfur host to achieve excellent electrochemical performance. Based on in situ synchrotron X-ray diffraction, the mechanism of the room temperature Na/S battery is proposed to be reversible reactions between S-8 and Na2S4, corresponding to a theoretical capacity of 418 mAh g(-1). The cell is capable of achieving high capacity retention of similar to 88.8% over 200 cycles, and superior rate capability with reversible capacity of similar to 390 and 127 mAh g(-1) at 0.1 and 5 A g(-1), respectively.
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