1 research outputs found
Manipulating the Redox Kinetics of Li–S Chemistry by Tellurium Doping for Improved Li–S Batteries
Fundamentally
altering the essential properties of a material itself
is always of great interest but challenging as well. Herein, we demonstrate
a simple tellurium doping method to intrinsically reshape the electronic
properties of the sulfur and manipulate the kinetics of Li–S
chemistry for improving the performance of Li–S batteries.
DFT calculation indicates that Te doping can effectively facilitate
the lithiation/delithiation reactions and lower the lithium ion diffusion
energy barrier in Li<sub>2</sub>S. Additionally, electrochemical studies
prove that the reaction kinetics of Li–S chemistry and cycling
performance of Li–S batteries have been significantly improved
with Te dopants. An exceptional specific capacity of ∼656 mA
h g<sup>–1</sup> and a high Coulombic efficiency of ∼99%
have been achieved at 5 A g<sup>–1</sup> even after 1000 cycles.
More importantly, the capability to manipulate the intrinsic properties
of materials and explore the synergistic effects between conventional
strategies and element doping provides new avenues for Li–S
batteries and beyond