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In the absence of effective electrolyte additives, PET can #depolymerize into its monomer dimethyl terephthalate, which is an unwanted #redox shuttle that induces substantial self-discharge in a lithium-ion cell. This study presents a chemical screening experiment to probe the PET decomposition mechanism involving in situ generated methanol and lithium methoxide from dimethyl carbonate, one of the most common #electrolyte #solvents in lithium-ion cells.