Quantifying Localized Lithium Plating Onset via Differential Voltage Tracking
Differential voltage tracking identifies localized lithium plating onset by detecting subtle slope shifts during charge and characteristic dV/dt relaxation plateaus.
Post Mortem Anode Inspection
Meaning
Physical and chemical analysis of a disassembled battery anode after cycling identifies the specific degradation mechanisms that occurred. A post mortem anode inspection involves opening the cell in an inert atmosphere, extracting the negative electrode and analyzing it using scanning electron microscopy or x-ray diffraction. This analysis reveals the presence of lithium plating, binder degradation or structural cracking, helping researchers optimize formulation parameters for subsequent material iterations.
Analytical Step
Disassembly must be performed carefully to avoid altering the state of the active materials. During post mortem anode inspection, researchers wash the electrode with a solvent to remove residual electrolyte salts. This cleaning enables clear observation of the solid electrolyte interphase and plated lithium.
Degradation Tracking
Structural changes in the graphite or silicon active material are documented to improve cell design. Utilizing post mortem anode inspection helps verify whether capacity loss was caused by active material isolation or continuous passivation growth. This feedback guides the development of more stable electrode formulations.
Safety Validation
Forensic investigation of failed cells helps identify the root cause of short circuits or thermal runaway. A thorough post mortem anode inspection can locate localized defects or dendrite penetration sites. This information is vital for improving cell safety and manufacturing quality.