Abstract
Energy issues have attracted great concern worldwide. Developing new energy has been the main choice, and the exploitation of the electrochemical energy storage devices plays an important role. Herein, a high-performance dual-ion battery system is proposed, which consists of a graphite cathode and SnS(2) anode, with a high-concentration lithium salt electrolyte (4 M LiTFSI). The benefits from the typical sandwich-like layer structure of SnS(2) are as follows: the highest discharge specific capacity of the battery could reach 130.0 mA h g(-1) at a current density of 100 mA g(-1), and even under an ultra-high current density of 2000 mA g(-1), the highest capacity of 66.3 mA h g(-1) is still achieved, with an outstanding capacity retention over 100% after 1000 cycles. Inspiringly, this system delivers an excellent low self-discharge of 1.19%/h, surpassing most of the reported dual-ion batteries. In addition, the working mechanism and structural stability are also investigated by X-ray diffraction and Raman spectra, indicating a good reversibility. These results reveal that this graphite/SnS(2) dual-ion battery system could provide a promising alternative for a future high-performance energy storage device.