The reaction between the negative electrode and the electrolyte in a lithium-ion battery
1. The reaction that disrupts the structure of the carbon anode will cause changes in the structure of the carbon material.
2. Protect the surface of the carbon material, that is, form a passivation film or SEI film (solid electrolyte interface) on the surface of the carbon anode.
Three different reaction changes of electrolyte to negative electrode carbon
The reaction between the negative electrode and the electrolyte in a lithium-ion battery
Destruction and protection of reduction reactions
Solventized lithium ions cross the electrode/electrolyte interface and directly enter the interlayer of the carbon material. The intercalated solvent molecules decompose at a lower potential to generate lithium salts that precipitate between the graphite layers. Simultaneously, a large amount of gas is generated, causing delamination of the carbon material structure. Solventized lithium ions also gain electrons on the carbon anode surface and undergo a reduction decomposition reaction. This process also generates lithium salts and gas, but the generated lithium salt dielectric deposits on the carbon anode surface to form a passivation film, preventing solvent intercalation and reduction.
