公开(公告)号：US20180190973A1

公开(公告)日：2018-07-05

申请号：US15905017

申请日：2018-02-26

Applicant: Massachusetts Institute of Technology

Inventor： Xinwei Chen ,  Jiayan Luo ,  Yet-Ming Chiang

IPC: H01M4/1397 ,  H01M4/136 ,  H01M4/04 ,  H01M4/38 ,  H01M4/62 ,  H01M10/052

CPC classification number: H01M4/1397 ,  H01M4/0483 ,  H01M4/136 ,  H01M4/38 ,  H01M4/625 ,  H01M10/052 ,  H01M2300/0028 ,  H01M2300/0065 ,  H01M2300/0068

Abstract: Embodiments described herein relate generally to lithium sulfur batteries and methods of producing the same. As described herein, preventing coarsening of sulfur during the well-known melt-diffusion processing of cathodes allows a high areal capacity of 10.7 mAh/cm2 at current density of 3.4 mA/cm2 (C-rate of 1/5 h−1). The addition of a lithium salt, such as LiTFSI, prior to melt-diffusion can prevent coarsening of molten sulfur and allows creation of a sulfur electrode with a high concentration of triple-phase junctions for electrochemical reaction. In some embodiments, approximately 60-70% utilization of the theoretical capacity of sulfur is reached at a high loading (e.g., greater than 7.5 mg S/cm2). The electrodes are prepared in lean-electrolyte environment of 3 mlelectrolyte/gsulfur (˜70 vol % of electrolyte in the electrode) for high areal capacity in Li—S batteries.

公开(公告)号：US10319989B2

公开(公告)日：2019-06-11

申请号：US15905017

申请日：2018-02-26

Applicant: Massachusetts Institute of Technology

Inventor： Xinwei Chen ,  Jiayan Luo ,  Yet-Ming Chiang

IPC: H01M4/1397 ,  H01M4/136 ,  H01M4/04 ,  H01M4/38 ,  H01M4/62 ,  H01M10/052

Abstract: Embodiments described herein relate generally to lithium sulfur batteries and methods of producing the same. As described herein, preventing coarsening of sulfur during the well-known melt-diffusion processing of cathodes allows a high areal capacity of 10.7 mAh/cm2 at current density of 3.4 mA/cm2 (C-rate of 1/5 h−1). The addition of a lithium salt, such as LiTFSI, prior to melt-diffusion can prevent coarsening of molten sulfur and allows creation of a sulfur electrode with a high concentration of triple-phase junctions for electrochemical reaction. In some embodiments, approximately 60-70% utilization of the theoretical capacity of sulfur is reached at a high loading (e.g., greater than 7.5 mg S/cm2). The electrodes are prepared in lean-electrolyte environment of 3 mlelectrolyte/gsulfur (˜70 vol % of electrolyte in the electrode) for high areal capacity in Li—S batteries.