Lithium ion battery SEI film formation mechanism.marine battery for trolling motor

　　1. Under a certain negative electrode potential, lithium ion ions and electrolyte interfaces in the electrode/electrolyte interface, solvents molecules, lithium salt yin ions, additives, and even impurities molecules, irreversible reactions occur in the electrode/electrolyte interface.

　　2. The irreversible reaction mainly occurs during the first charging process of the battery.

　　3. After the electrode surface is completely covered by the SEI membrane, the irreversible reaction stops

　　4. Once a stable SEI film is formed, the charging and discharge process can be carried out multiple times

　　5. During the first charging of the battery, the carbon negative surface first establishes a complete, dense, and dense SEI film on the LI+plug -in

　　Dual -electronic reaction:

　　PC/EC+2E → acryline/ethylene+Co₃²¯

　　Co﹢+ Li l → li co₃ single electronic reaction to form alkyl carbonate:

　　PC/EC + E → PC﹣/EC﹣ Freedom Base

　　Lithium oxyxyxyl carbonate+H₂o → li₂co₃+Co₂+(ch₂oh) ₂ ₂

　　There are two assumptions about the guidance of the SEI membrane Li+:

　　1. LIT in the liquid phase reaches the SEI membrane interface, and the cation exchange transmission occurs with the help of the SEI membrane lithium salt component;

　　2. Migrate directly through the SEI membrane micropholic to the electrode body after the li+dehumidification in the liquid phase

　　The formation of SEI membrane is the result of the interaction between carbon negative and electrolyte. Its stability depends on the nature of the electrode and electrolyte

　　1. The effect of electrode interface nature on the stability of the SEI membrane

　　2. The effect of electrolyte composition on SEI membrane stability

　　3. Effect of impurities in electrolytes

　　4. The effect of temperature

　　5. Effect of current density

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