4.7 Article

Multifunctional transitional metal-based phosphide nanoparticles towards improved polysulfide confinement and redox kinetics for highly stable lithium-sulfur batteries

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 450, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.138310

Keywords

Lithium-sulfur batteries; Modified separator; Phosphide; Redox kinetics; Chemical adsorption

Funding

  1. National Natural Science Foundation of China [52072256]
  2. Central Guidance on Local Science and Technology Development Fund of Shanxi Province [YDZJSX2021B005]
  3. Natural Science Foundation of Shanxi Province [20210302124096]
  4. Laboratory Directed Research and Development (LDRD)
  5. Argonne National Laboratory

Ask authors/readers for more resources

The researchers developed a Ni2P@NPG electrocatalyst to address the issues of shuttle effect and sluggish redox kinetics in lithium-sulfur batteries. The electrocatalyst reduces the accumulation of lithium polysulfides in the electrolyte and provides abundant conversion interfaces, resulting in improved cycling performance and rate capability of the batteries.
The shuttle effect and the sluggish redox kinetics of lithium polysulfides (LiPSs) are the major issues impeding the practical applications of lithium-sulfur batteries (LSBs). Herein, a highly-efficient Ni2P electrocatalyst supported on N, P co-doped graphene (Ni2P@NPG) is developed via a simple recrystallization-self-assembly method to address the above issues. The ultrafine Ni2P nanoparticles ensure abundant adsorption-diffusion-conversion interfaces for accelerating LiPSs transformation and Li2S deposition, which extremely decreases the accumulation of LiPSs in the electrolyte and therefore prevents the migration of LiPSs. Their superior catalytic performance is demonstrated by reduced Gibbs free energy changes of rate-limiting step based on the systematic theoretical calculations and the reduced shuttle effect is tested by the three-dimensional reconstructions of Raman depth profiles. Benefiting from these synergistic effects, the LSBs with Ni2P@NPG modified separators present a superior cycling performance with an average capacity decay rate of 0.048 % per cycle at 1C around the 400 cycles and a high-rate capacity of 731 mAh/g at 2C. Even with a high-sulfur loading of 3.53 mg cm(-2), the cell can still contain a reversible capacity of 809 mAh/g at 0.2C with a remarkable columbic efficiency of 98.4 %.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available