Meaning
Electrochemical side reactions deposit metallic lithium onto the negative electrode surface when the charging rate exceeds the intercalation capability of the host material. Cold temperatures or high current densities often trigger anode lithium plating by increasing the diffusion resistance within the graphite layers. This surface layer consumes active lithium and reduces the overall energy density of the cell over time.
Kinetic Limitation
Sluggish movement of ions at low temperatures defines the Kinetic Limitation of anode lithium plating. Electrolyte viscosity increases and the charge transfer resistance at the solid electrolyte interface becomes the dominant factor in the voltage drop. Designers mitigate this by implementing heating cycles before fast charging begins to ensure the anode remains above the plating potential.
Capacity Decay
Accumulating metallic deposits leads to the Capacity Decay of anode lithium plating as reversible ions transition into an inactive state. Dendrites formed during this process may also lead to internal short circuits if they penetrate the separator. Long term cycling data shows a non linear drop in power as these surface layers grow and block electrode pores.
Safety Hazard
Monitoring the terminal voltage for a characteristic plateau during the rest period identifies the Safety Hazard of anode lithium plating. Precise charging algorithms adjust the current limit to keep the potential above the threshold where metallic lithium forms. Avoiding these deposits is essential for preventing thermal runaway in high energy density battery packs.
