Controlling
the Intercalation Chemistry to Design
High-Performance Dual-Salt Hybrid Rechargeable Batteries
- Publication date
- Publisher
Abstract
We
have conducted extensive theoretical and experimental investigations
to unravel the origin of the electrochemical properties of hybrid
Mg<sup>2+</sup>/Li<sup>+</sup> rechargeable batteries at the atomistic
and macroscopic levels. By revealing the thermodynamics of Mg<sup>2+</sup> and Li<sup>+</sup> co-insertion into the Mo<sub>6</sub>S<sub>8</sub> cathode host using density functional theory calculations,
we show that there is a threshold Li<sup>+</sup> activity for the
pristine Mo<sub>6</sub>S<sub>8</sub> cathode to prefer lithiation
instead of magnesiation. By precisely controlling the insertion chemistry
using a dual-salt electrolyte, we have enabled ultrafast discharge
of our battery by achieving 93.6% capacity retention at 20 C and 87.5%
at 30 C, respectively, at room temperature