Improved Performance of High Voltage Graphite/LiNi_0.5Mn_1.5O₄ Batteries with Added Lithium Tetramethyl Borate

Authors

Mengqing Xu, University of Rhode Island
Liu Zhou, University of Rhode Island
Yingnan Dong, University of Rhode Island
Usha Tottempudi, University of Rhode Island
Julien Demeaux, University of Rhode Island
Arnd Garsuch
Brett L. Lucht, University of Rhode IslandFollow

Document Type

Article

Date of Original Version

2015

Department

Chemistry

Abstract

Lithium tetramethyl borate (LTMB, LiB(OCH₃)₄) has been prepared and investigated as a novel cathode film forming additive to improve the performance of LiNi_0.5Mn_1.5O₄ cathodes cycled to high potential (4.25-4.8 V). Addition of LTMB to 1.2 M LiPF₆ in EC/EMC (3/7, v/v) improves the capacity retention of graphite/LiNi_0.5Mn_1.5O₄ cells cycled at 55°C. The added LTMB is sacrificially oxidized on the surface of the cathode during the first charging cycle. Ex-situ surface analysis of the LiNi_0.5Mn_1.5O₄ by X-ray photoelectron spectroscopy (XPS) reveals the presence of a borate based passivating layer which appears to inhibit electrolyte oxidation on the cathode surface.

Citation/Publisher Attribution

Xu, M., Zhou, L., Dong, Y., Tottempudi, U., Demeaux, J., Garsuch, A., & Lucht, B. L. (2015). Improved Performance of High Voltage Graphite/LiNi_0.5Mn_1.5O₄ Batteries with Added Lithium Tetramethyl Borate. ECS Electrochem. Lett. 4(8), A83-A86. doi: 10.1149/2.0021508eel

Available at: http://dx.doi.org/10.1149/2.0021508eel

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