Improving the Performance at Elevated Temperature of High Voltage Graphite/LiNi_0.5Mn_1.5O₄ Cells with Added Lithium Catechol Dimethyl Borate

Authors

Yingnan Dong
Julien Demeaux
Yuzi Zhang
Mengqing Xu
Liu Zhou
Alex D. MacIntosh
Brett L. Lucht, University of Rhode IslandFollow

Document Type

Article

Date of Original Version

2017

Department

Chemistry

Abstract

Performance of LiNi_0.5Mn_1.5O₄/graphite cells cycled to 4.8 V at 55°C with the 1.2 M LiPF₆ in EC/EMC (3/7, STD electrolyte) with and without added lithium catechol dimethyl borate (LiCDMB) has been investigated. The incorporation of 0.5 wt% LiCDMB to the STD electrolyte results in an improved capacity retention and coulombic efficiency upon cycling at 55°C. Ex-situ analysis of the electrode surfaces via a combination of SEM, TEM, and XPS reveals that oxidation of LiCDMB at high potential results in the deposition of a passivation layer on the electrode surface, preventing transition metal ion dissolution from the cathode and subsequent deposition on the anode. NMR investigations of the bulk electrolyte stored at 85°C reveals that added LiCDMB prevents the thermal decomposition of LiPF₆.

Citation/Publisher Attribution

Dong, Y., Demeaux, J., Zhang, Y., Xu, M., Zhou, L., MacIntosh, A. D., & Lucht, B. L. (2017). Improving the Performance at Elevated Temperature of High Voltage Graphite/LiNi_0.5Mn_1.5O₄ Cells with Added Lithium Catechol Dimethyl Borate. J. Eletrochem. Soc., 164(2), A128-A136. doi: 10.1149/2.0331702jes

Available at: http://dx.doi.org/10.1149/2.0331702jes

Creative Commons License

This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.