Abstract
LiNi0.5Mn1.5O4 (LNMO) is a potential cathode material for lithium-ion batteries with outstanding energy density and high voltage plateau (>4.7 V). However, the interfacial side reaction between LNMO and the liquid electrolyte seriously causes capacity fading during cycling at the high voltage. Here, p-toluenesulfonyl isocyanate (PTSI) is used as the electrolyte additive to overcome the above problem of LNMO. The results show that the specific capacity of LNMO/Li cell with 0.5 wt.% PTSI at the first cycle is effectively enhanced by 36.0 mAh/g and has better cycling performance than that without PTSI at 4.98 V. Also, a stable solid electrolyte interface (SEI) film derived from PTSI is generated on the electrode surface, which could alleviate the strike of hydrofluoric acid (HF) caused by electrolyte decomposition. These results are explained by the molecular structure of PTSI, which contains SO3. The S=O groups can delocalize the nitrogen nucleus to block the reactivity of PF5.
Highlights
Over the past few years, the high energy and power density capability of lithium-ion batteries (LIBs) have been interested extremely, due to potential applications in electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs) (Taracson and Armand, 2001; Armand and Tarascon, 2008; Ji et al, 2011; Kim et al, 2012)
A stable solid electrolyte interface (SEI) film derived from p-toluenesulfonyl isocyanate (PTSI) is generated on the electrode surface, which could alleviate the strike of hydrofluoric acid (HF) caused by electrolyte decomposition
What’s more, the specific capacity of LNMO/Li cell with 0.5 wt.% PTSI added after 40 cycles was much higher than that of LNMO/Li cell without additive
Summary
Over the past few years, the high energy and power density capability of lithium-ion batteries (LIBs) have been interested extremely, due to potential applications in electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (PHEVs) (Taracson and Armand, 2001; Armand and Tarascon, 2008; Ji et al, 2011; Kim et al, 2012). A stable solid electrolyte interface (SEI) film derived from PTSI is generated on the electrode surface, which could alleviate the strike of hydrofluoric acid (HF) caused by electrolyte decomposition.
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