Journal
ENERGY STORAGE MATERIALS
Volume 18, Issue -, Pages 246-252Publisher
ELSEVIER
DOI: 10.1016/j.ensm.2018.09.006
Keywords
Single atom catalysis; Lithium sulfur battery; Conversion cathode; Energy barrier; Lithium ion kinetics
Funding
- National Key R&D Program of China [2016YFB0100100]
- National Natural Science Foundation of China [21433013, 21773294, 51402345]
- CAS-Queensland Collaborative Science Fund [121E32KYSB20160032]
- CAS-DOE Joint Research Program [121E32KYSB20150004]
- BSRF
- SSRF
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High energy barrier originated from the sluggish ion kinetics is considered to be a major obstacle for achieving high discharge rates in advanced battery systems, especially for electric vehicle applications. Herein, for the first time we show that the single atom catalyst can play a compelling role in boosting the electrochemical conversion kinetics and achieving previously-unreachable ultra-high-rate performance. Both experimental and theoretical results prove that atomically-dispersed single iron atoms promote the delithiation of relatively-inert Li2S cathode and accelerate the reversible electrochemical conversion reactions during its long-term cycling. The work demonstrates the effectiveness of single atom catalysis in improving the performance of Li2S/Li batteries (588 mAh g(-1) at 12 C and capacity fading rate of 0.06% per cycle for 1000 cycles at 5 C) and opens a new route to breaking the rate limit for other future conversion-based high energy batteries.
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