Lithium-ion battery anode sei film and preparation method thereof
A lithium-ion battery and anode technology, applied in battery electrodes, electrolyte battery manufacturing, battery pack components, etc., can solve the problems of large irreversible capacity, first-time efficiency of cells, reversible capacity, and reduced energy density.
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Embodiment 1
[0036] Stir the artificial graphite with other ingredients to prepare the anode slurry and coat it on the copper foil, then wind or stack the prepared anode sheet, cathode sheet and separator to obtain the bare cell, and put the bare cell into the Bake in the packaging bag or packaging shell, then inject an appropriate amount of electrolyte, and let it stand until the electrolyte is fully soaked before use.
[0037] Use a chemical forming machine to carry out the first chemical formation of the above-mentioned battery cores. The formation temperature is 15°C, the formation current is 0.01C, and the formation cut-off potential is 3.0V; after that, the batteries are taken out, and the batteries are placed in the Bake it in a baking oven at 60°C for 30 minutes, take it out, and then use a chemical formation machine to carry out the second formation. The formation temperature is 35°C, the formation current is 0.04C, and the formation cut-off potential is 3.9V. The anode SEI film o...
Embodiment 2
[0039] Take natural graphite and other ingredients to make anode slurry and coat it on copper foil, then wind and assemble the prepared anode sheet, cathode sheet, and separator to obtain a bare cell, and put the bare cell into an aluminum-plastic film Top seal and side seal are carried out in the packaging bag, and then put into the oven to bake, and then inject an appropriate amount of electrolyte, and stand until the electrolyte is fully infiltrated before use.
[0040] Use a chemical forming machine to carry out the first chemical forming of the above-mentioned cells. The forming temperature is 45°C, the forming current is 0.02C, and the forming cut-off potential is 3.6V. After the forming process is completed, the AC impedance of the cell is scanned. The results are as follows figure 1 As shown; after that, take out the cell, apply a surface pressure of 1 MPa to the cell, put it in a baking oven at 85°C for 6 hours, take it out, and scan the AC impedance of the cell again,...
Embodiment 3
[0042] Stir the artificial graphite with other ingredients to prepare the anode slurry and coat it on the copper foil, then wind or stack the prepared anode sheet, cathode sheet and separator to obtain the bare cell, and put the bare cell into the Bake in the packaging bag or packaging shell, then inject an appropriate amount of electrolyte, and let it stand until the electrolyte is fully soaked before use.
[0043] Use a chemical forming machine to carry out the first chemical formation of the above-mentioned batteries, the chemical formation temperature is 115°C, the chemical formation current is 1C, and the chemical formation cut-off potential is 2.8V; after that, the battery is taken out, and the surface of the battery is placed at 115 under a pressure of 10MPa. ℃ baking oven for 20 hours and then take it out; then use a chemical forming machine to carry out the second chemical forming, the forming temperature is 65 ℃, the forming current is 0.2C, and the forming cut-off po...
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Abstract
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