Effect of Tributyl Borate on Electrochemical Performance at an Elevated Temperature of High-Voltage LiNiMnO Cathode.

Author(s) Huang, T.; Zheng, X.; Pan, Y.; Li, Q.; Wu, M.
Journal ACS Appl Mater Interfaces
Date Published 2019 Jul 31
Abstract

Tributyl borate (TBB) is studied as a protective additive that enhances the interfacial stability of a LiNiMnO cathode/electrolyte at 5 V and 55 °C. Upon addition of 0.5 vol % TBB to the electrolyte (1.0 M LiPF/EC:EMC:DMC, 1:1:1 wt %), the LiNiMnO/Li cell maintains a discharge capacity of 99.4 mAh g at the 50th cycle at 55 °C, compared to that of the electrolyte without an additive, i.e., 36.6 mAh g. Furthermore, the TBB-enhanced Li/LiNiMnO cell exhibits a higher discharge capacity of 96 mAh g at 3C, whereas the cell without TBB delivers only 84 mAh g. Theoretical calculations and differential capacity (d/d) versus voltage () analysis show that TBB improves the electrochemical performance at 5 V and 55 °C by preferentially oxidizing on the LiNiMnO surface. The results obtained from electrochemical impedance spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and inductively coupled plasma-mass spectroscopy measurements reveal that TBB generates a thin, less resistive film on the surface of LiNiMnO. This TBB-derived film inhibits the decomposition of the carbonate solvent, while suppressing the dissolution of Ni and Mn ions from LiNiMnO.

DOI 10.1021/acsami.9b07126
ISSN 1944-8252
Citation Huang T, Zheng X, Pan Y, Li Q, Wu M. Effect of Tributyl Borate on Electrochemical Performance at an Elevated Temperature of High-Voltage LiNiMnO Cathode. ACS Appl Mater Interfaces. 2019;11(30):26872-26879.

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