Nonlinear current stimulation unlocks high-performance Zn-Mn batteries via reversible phase transformation.

Area of Science:

• Electrochemistry
• Materials Science
• Nonlinear Dynamics

Background:

• Zinc-manganese (Zn-Mn) batteries face challenges due to complex reaction mechanisms, limiting their practical application.
• Precise control over zinc dissolution and deposition is crucial for enhancing battery performance.

Purpose of the Study:

• To investigate the impact of nonlinear electrical signals on Zn-Mn battery electrode reactions.
• To establish a correlation between waveform nonlinearity and electrochemical modulation for improved battery kinetics.

Main Methods:

• Stepwise evolution of current signals from constant current to chaotic regimes.
• Systematic investigation of nonlinear electrical signals and electrode reaction coupling.
• In situ visualization, SEM imaging, thermodynamic, and dynamic analyses.

Main Results:

• Chaotic currents significantly enhance the reversible transformation between Zn4SO4(OH)6·nH2O (ZSH) and ZnxMnO(OH)2 (ZMO) phases.
• Accumulation of inactive ZSH/ZMO phases identified as the primary cause of kinetic decay.
• Chaotic activation improved battery capacity, rate performance, and cycling stability, with flexible cells retaining 76.37% capacity after 1550 cycles.
• Nonlinear current stimulation reconstructed fractal mass transport pathways, optimizing ion pathways and structural stability.

Conclusions:

• Nonlinear electrical stimulation offers a promising strategy for developing high-performance aqueous Zn-Mn batteries.
• Understanding the interplay between nonlinear circuit dynamics and electrochemistry is key to advancing battery technology.
• Optimized ion transport and structural stability through fractal pathway reconstruction enhance overall battery longevity and efficiency.