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An innovative lithium ion battery system based on a Cu2S anode material.

Cu2S is considered as one of the potential anode paradigms for advanced rechargeable batteries because of its high theoretical capacity (~335mAh·g-1), high and flat charge/discharge voltage plateaus (~1.7 V vs Li+/Li), stable cycling performance as well as its elemental abundance. However, many researches 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 (LIBs). Here, we provide a fundamental understanding of the electrochemical processes of Cu2S in both ether- and carbonate-based electrolytes by 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 demonstrate its feasibility in lithium ion full cell batteries for the first time. Our experiment provides the basis for the utilization of Cu2S in industrial-scale applications for large-scale electrical energy storage.