Insights from Ab Initio Molecular Dynamics on the Interface Reaction between Electrolyte and Li₂MnO₃ Cathode during...

Area of Science:

• Materials Science
• Electrochemistry
• Computational Chemistry

Background:

• Interface reactions significantly impact Li2MnO3 cathode material performance in batteries.
• Understanding these reactions is crucial for developing advanced energy storage solutions.

Purpose of the Study:

• To systematically investigate interface reactions between Li2MnO3 surfaces and liquid electrolytes during charging.
• To elucidate the mechanisms and products of these critical interface processes using computational methods.

Main Methods:

• Utilized ab initio molecular dynamics (AIMD) simulations.
• Employed first-principles calculations to analyze interface phenomena.
• Focused on typical surfaces of Li2MnO3 during the charging process.

Main Results:

• Identified formation of hydroxide radicals, oxygen, carbon dioxide, and carbonate radicals.
• Observed layered- and spinel-like phase transitions on Li2MnO3 surfaces.
• Attributed phase transitions to decreased Mn-O bond strength and increased Li/O ion vacancies.

Conclusions:

• Interface reactions involve conversion of O2- to reactive oxygen ions via electron loss.
• Simulated results align with experimental observations of reaction products and phase transitions.
• Provides theoretical insights into lithium-rich cathode-electrolyte interactions for battery optimization.