Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 15, Pages 17396-17405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b21982
Keywords
Cu2S; anode; electrolytes; lithium ion battery; synchrotron X-ray; X-ray absorption spectroscopy
Funding
- National Natural Science Foundation of China [21621091, 21875195]
- National Key Research and Development Program of China [2017YFB0102000]
- National Science Foundation [DMR-1332208]
- CHESS under NSF award
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Cu2S is considered as one of the potential anode paradigms for advanced rechargeable batteries because of its high theoretical capacity (similar to 335 mAh.g(-1)), high and flat charge/discharge voltage plateaus (similar to 1.7 V vs Li+/Li), stable cycling performance, and its elemental abundance. However, many studies have shown that Cu2S exhibits a dramatic capacity fade in carbonate-based electrolytes, which has precluded its commercialization when paired with high voltage cathodes in state-of-the-art lithium ion batteries. Here, we report on a fundamental mechanistic study of the electrochemical processes of Cu2S in both ether- and carbonate-based electrolytes employing operando synchrotron X-ray methods. Based on our findings, we developed a Cu2S/C composite material that suppresses its failure mechanism in carbonate-based electrolytes and further demonstrated its feasibility in lithium ion full cells for the first time. Our experiment provides the basis for the utilization of Cu2S in industrial-scale applications for large-scale electrical energy storage.
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