A nonpolar buffer layer on MoS2 surface to improve stability in lithium ion battery

• Published in: Materials letters 2021-03, Vol.287, p.129228, Article 129228
• Main Authors: Jin, Yanshuo, Lin, Zhipeng, Chen, Hongzhan, Liang, Wanli, Xu, Jinchang, Wu, Yinlong, Huang, Guoju, Wang, Nan, Huang, Qizhang, Zhang, Hao, Chen, Jian, Xie, Fangyan, Shi, Jifu, Meng, Hui
• Format: Article
• Language: English
• Subjects: Buffer layers; Current density; Discharge; Electrodes; Functional; Interfaces; Ions; Lithium; Lithium ion battery; Lithium-ion batteries; Materials science; Molybdenum disulfide; Rechargeable batteries; Stability; Surface stability; Surfaces
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2020.129228

This work reports a very facile but effective way to improve the cycling stability of MoS2, which is realized by imprinting a nonpolar buffer layer on the surface of MoS2 to stabilize the SEI layer. [Display omitted] •This work reports an effective way to improve the cycling stability of MoS2 in lithium ion battery.•The SEI layer is stabilized by a nonpolar buffer layer on the surface of MoS2.•Imprinting is an effective way to change the surface property of material. Octodecane was imprinted onto MoS2 to form a nonpolar buffer layer, which can get much better cyclic and rate performance in lithium ion battery. The discharge capacity retention of pristine MoS2 electrode is less than 20% after continuous operation for only 175 h at a current density of 200 mA g−1. While after continuous operation for over 400 h at a current density of 200 mA g−1, the octodecane-MoS2 electrode can still embrace a discharge capacity retention of 50%. The buffer layer can reduce the effect of volume change and prevent SEI from rupturing, thereby forming the uniform and stable SEI. This is a new exploration of the imprint technology on the lithium ion electrode, and provides a new idea for solving the life of the lithium ion battery.