Insight
into the Mechanism of Improved Interfacial
Properties between Electrodes and Electrolyte in the Graphite/LiNi0.6Mn0.2Co0.2O2 Cell via Incorporation
of 4‑Propyl-[1,3,2]dioxathiolane-2,2-dioxide (PDTD)
posted on 2018-03-22, 00:00authored byYilong Lin, Mengqing Xu, Suping Wu, Yuanyuan Tian, Zhiguang Cao, Lidan Xing, Weishan Li
4-Propyl-[1,3,2]dioxathiolane-2,2-dioxide (PDTD) has
been investigated
as an electrolyte additive for the graphite/LiNi0.6Mn0.2Co0.2O2 pouch cell. A significant
improvement on the initial Coulombic efficiency and cycling stability
has been achieved by incorporating 1.0 wt % PDTD additive. Specifically,
initial Coulombic efficiency increased from 83.7% (baseline) to 87.8%
(w/w, 1.0 wt % PDTD), and from 75.7% to 83.7% for capacity retention
after 500 cycles upon cycling at room temperature. Improvements in
the interfacial properties between cathode and electrolyte as well
as between anode and electrolyte through incorporation of 1.0 wt %
PDTD are believed to account for the observed enhanced cell performance.
Insight into the mechanism of improved interfacial properties between
electrodes and electrolyte in the graphite/LiNi0.6Mn0.2Co0.2O2 system has been addressed
with a combination of theoretical computation and experimental techniques,
including electrochemical methods and spectroscopic characterization.