Key Findings
Electrolyte-sensitive interfacial degradation is a critical dimension for the reliable prediction of lithium-ion battery lifetimes. The study found that varying the solvent ratio leads to distinct lifetime trajectories across comparable cells, a divergence associated with parasitic reactions, spatially heterogeneous surface degradation, and electrolyte-sensitive interphase growth.
Technical Details
Researchers utilized customized multi-layer pouch cells to examine degradation under accelerated conditions. The experimental framework varied the following parameters:
- Ethylene carbonate:dimethyl carbonate ratio
- Lithium hexafluorophosphate concentration
- Electrolyte amount
To analyze these effects, the team employed electrochemical diagnostics, gas analysis, and post-mortem interfacial characterization. These findings were then integrated into a physics-based degradation model incorporating electrolyte-dependent thermodynamic and transport properties.
The results indicated that a transport-only model implementation failed to reproduce the observed separation in capacity-retention trajectories. However, introducing a minimal electrolyte-sensitive refinement via an effective interphase transport parameter improved the agreement in cases rich in ethylene carbonate.
Background & Context
Current continuum degradation models typically represent the electrolyte through bulk transport. This approach fails to capture the specific role of the electrolyte in interfacial degradation, which remains a major obstacle to the sustainable deployment of lithium-ion batteries. This gap in modeling contributes to increased material demand, premature battery retirement, and uncertainty in lifecycle assessments.
Significance & Outlook
By identifying the necessity of electrolyte-dependent interfacial kinetics in modeling, this research provides a pathway toward more accurate lifetime predictions. Moving beyond bulk transport representations allows for a deeper understanding of how specific electrolyte formulations influence the physical and chemical kinetics at the interface, ultimately impacting the overall durability of the battery system.
Source: https://doi.org/10.1038/s41467-026-79025-3
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