Lithium plating occurs when metallic lithium deposits on the negative electrode surface instead of intercalating into it. This degradation mechanism reduces available lithium, increases resistance, and in severe cases forms dendrites that pose safety risks. Understanding the conditions that cause plating is crucial for fast-charging applications.Documentation Index
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What Is Lithium Plating?
Lithium plating occurs when metallic lithium deposits on the surface of the negative electrode instead of intercalating into it. Unlike lithium ions stored within the electrode structure, plated lithium forms a separate layer that can significantly impact battery performance and safety.Conditions That Favor Lithium Plating
Low Temperatures
At cold temperatures, lithium-ion diffusion slows down, making it harder for
lithium ions to intercalate into the electrode. If charging continues at
high rates, lithium can accumulate as a metallic layer.
High Charging Currents
Fast charging pushes lithium ions into the anode rapidly. If the electrode
cannot accommodate them quickly enough, plating occurs.
High State of Charge
When the negative electrode is nearly full, there are fewer available sites
for lithium-ion storage, increasing the likelihood of plating.
Why Lithium Plating Is Problematic
Lithium plating contributes to battery degradation in multiple ways:| Effect | Consequence |
|---|---|
| Reduced lithium inventory | Less lithium available for charge storage |
| Increased internal resistance | Higher energy losses, more heat |
| Dendrite formation | Potential safety hazard |
Modeling Lithium Plating
Lithium plating is typically modeled alongside other electrochemical processes, much like SEI growth. A plating reaction term is added to the electrochemical equations to describe how much lithium deposits on the electrode surface, and an additional equation tracks how this affects electrode porosity.Modeling Approaches
| Model Type | Description |
|---|---|
| Irreversible plating | Plated lithium is permanently lost, reducing the battery’s lithium inventory over time |
| Reversible plating | Under certain conditions, plated lithium can dissolve back into the electrolyte during discharge, partially mitigating its effects |
| Partially reversible plating | A combination of both behaviors—some lithium is lost while some can re-enter the electrochemical cycle |
These models assume lithium plating forms a uniform layer. To model dendritic
growth, more complex 2D/3D modeling is required to fully capture their
formation and impact on battery safety.
Related Topics
- Degradation Overview—how lithium plating contributes to LLI
- SEI Growth—a closely related anode degradation mechanism
- Mechanical Degradation—structural damage from repeated cycling
- Thermal Modelling—how low temperatures promote plating
- Battery Management Systems—how the BMS prevents plating conditions