Fang Yao-Bing, Zheng Wen, Hu Tao, Li Li, Yuan Wen-Hui
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
Guangdong Engineering Technology Research Center of Advanced Insulating Coating, South China University of Technology-Zhuhai Institute of Modern Industrial Innovation, Zhuhai 519175, China.
ACS Omega. 2022 Feb 26;7(9):7616-7624. doi: 10.1021/acsomega.1c06134. eCollection 2022 Mar 8.
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 anode, with a high-concentration lithium salt electrolyte (4 M LiTFSI). The benefits from the typical sandwich-like layer structure of SnS are as follows: the highest discharge specific capacity of the battery could reach 130.0 mA h g at a current density of 100 mA g, and even under an ultra-high current density of 2000 mA g, the highest capacity of 66.3 mA h g 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 dual-ion battery system could provide a promising alternative for a future high-performance energy storage device.
能源问题已引起全球广泛关注。开发新能源一直是主要选择，而电化学储能装置的开发起着重要作用。在此，提出了一种高性能双离子电池系统，它由石墨阴极和SnS阳极组成，并使用高浓度锂盐电解质（4 M LiTFSI）。SnS典型的三明治状层结构带来的优势如下：在电流密度为100 mA g时，电池的最高放电比容量可达130.0 mA h/g，即使在2000 mA g的超高电流密度下，仍能实现66.3 mA h/g的最高容量，在1000次循环后具有超过100%的出色容量保持率。令人鼓舞的是，该系统具有1.19%/h的出色低自放电率，超过了大多数已报道的双离子电池。此外，还通过X射线衍射和拉曼光谱研究了其工作机制和结构稳定性，表明具有良好的可逆性。这些结果表明，这种石墨/SnS双离子电池系统可为未来高性能储能装置提供一个有前景的替代方案。
