High-capacity Ni-rich LiNi
x
Co
y
Mn1–x–y
O2 (NCM) has been investigated
as a promising
cathode active material for improving the energy density of lithium-ion
batteries (LIBs); however, its practical application is limited by
its structural instability and low thermal stability. In this study,
we synthesized tetrakis(methacryloyloxyethyl)pyrophosphate (TMAEPPi)
as a cathode electrolyte interphase (CEI) additive to enhance the
cycling characteristics and thermal stability of the LiNi0.8Co0.1Mn0.1O2 (NCM811) material.
TMAEPPi was oxidized to form a uniform Li+-ion-conductive
CEI on the cathode surface during initial cycles. A lithium-ion cell
(graphite/NCM811) employing a liquid electrolyte containing 0.5 wt
% TMAEPPi exhibited superior capacity retention (82.2% after 300 cycles
at a 1.0 C rate) and enhanced high-rate performance compared with
the cell using a baseline liquid electrolyte. The TMAEPPi-derived
CEI layer on NCM811 suppressed electrolyte decomposition and reduced
the microcracking of the NCM811 particles. Our results reveal that
TMAEPPi is a promising additive for forming stable CEIs and thereby
improving the cycling performance and thermal stability of LIBs employing
high-capacity NCM cathode materials.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.