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In order to prevent the thin film from becoming too limited, additives were mixed in the electrolyte consumed during the formation of the SEI layer. It is difficult or even impossible to trace their existence during detection and evaluation. This makes proprietary additives, both in terms of their composition and usage, trade secrets.

A famous additive is ethylene carbonate (VC). This chemical substance can improve the cycling life of lithium ions, especially at higher temperatures, and maintain a low internal resistance with use and aging. VC can also maintain a stable SEI film on the anode, and electrolyte oxidation has no adverse side effects on the cathode (Aurbach et al.). It is said that the academic and research communities lag behind battery manufacturers in their understanding and selection of additives, so they have great secrets.

For most commercial lithium-ion batteries, the SEI layer decomposes at battery temperatures of 75-90 ° C (167-194 ° F). The type and state of charge (SoC) of the battery can affect its breakdown at high temperatures. If not properly cooled, self heating behavior may occur, leading to thermal runaway. Laboratory tests conducted on 18650 batteries indicate that this thermal event may take two days to form.

The flammability of lithium-ion electrolytes is a further concern, and experiments have been conducted to produce non combustible or reduced flammability electrolytes through additives or the development of non organic ionic liquids. Research has also been conducted on operating lithium-ion batteries at low temperatures.

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