1 research outputs found
Solid Electrolyte Interphase Structure Regulated by Functional Electrolyte Additive for Enhancing Li Metal Anode Performance
Lithium
(Li) metal anodes have become an important component of
the next generation of high energy density batteries. However, the
Li metal anode still has problems such as Li dendrite growth and unstable
solid electrolyte interface layer. Herein, we present a functional
electrolyte additive (PANHF) successfully synthesized from acrylonitrile
and hexafluorobutyl methacrylate via a polymerization reaction. With
extensive analytical characterization, it is found that the PANHF
can improve the reversibility and Coulombic efficiency of the Li deposition/dissolution
reaction and prevent the growth of Li dendrites by forming a solid
electrolyte interphase rich in organic matter on the outer layer and
LiF on the inner layer. The results show that the cycling performance
of the Li/Li cell was greatly improved in the electrolyte containing
0.5 wt % PANHF. Specifically, the cycling stability of more than 700
cycles was achieved at a current density of 1.0 mA cm–2. Moreover, the Li/NCM811 cell with 0.5 wt % PANHF has a higher capacity
of 137.7 mA h g–1 at 1.0 C and a capacity retention
of 83.41% after 200 cycles. This work highlights the importance of
protecting the Li metal anode with functional bipolymer additives
for next-generation Li metal batteries