Method for testing specific capacity of pre-lithiated lithium powder and application thereof
A technology of pre-lithiation and lithium powder, applied in the direction of measuring devices, electrochemical variables of materials, electrochemical generators, etc., can solve the problems of reducing the working efficiency of the pre-lithiation process, so as to improve utilization rate, reduce cost, and reduce consumption Effect
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Embodiment 1
[0081] 1. Preparation of button cell
[0082] (1) Preparation of pre-lithiated working electrode pole piece
[0083] Dissolve 2.0 g of the binder PVDF in 38.0 g of NMP solution according to the mass ratio of 5 wt % to make a glue solution for 4 hours. Mix 6g of inert lithium powder and 2g of conductive agent acetylene black for 10 minutes. Slowly add the mixture of inert lithium powder and conductive acetylene black to the glue and mix evenly to obtain lithium powder slurry. Lithium powder, binder and conductive agent are mixed according to 60:20:20 to obtain lithium powder slurry, which takes 25 minutes . Then coated on the surface of current collector copper foil with a thickness of 30 μm, wherein the coating quality of the slurry is 2 mg / cm 2 (Based on the solid component mass not including the solvent), the calculated lithium powder loading capacity per unit area is 1.2mg / cm 2 , with a time of 10 minutes. Dry in a vacuum oven at 100°C for 2 hours, and ventilate with 9...
Embodiment 2
[0097] 1. Preparation of button cell
[0098] (1) Preparation of pre-lithiated working electrode pole pieces
[0099] Dissolve 1.5g of the binder PVDF in 48.5g of NMP solution according to the mass ratio of 3wt% to make a glue solution for 3 hours. Mix 6g of inert lithium powder and 2.5g of conductive agent acetylene black for 15 minutes. Slowly add the mixture of inert lithium powder and conductive acetylene black to the glue and mix evenly to obtain lithium powder slurry. Lithium powder, binder and conductive agent are mixed according to 60:15:25 to obtain lithium powder slurry, which takes 45 minutes . It is then coated on the surface of the current collector copper foil with a thickness of 30 μm, wherein the coating quality of the slurry is 1.5 mg / cm 2 (Based on the solid component mass not including the solvent), the calculated lithium powder loading capacity per unit area is 0.9mg / cm 2 , with a time of 20 minutes. Dry in a vacuum oven at 100°C for 1.5 h, and ventila...
Embodiment 3
[0114] 1. Preparation of button cell
[0115] (1) Preparation of pre-lithiated working electrode pole piece
[0116] Dissolve 2.5g of the binder PVDF in 47.5g of NMP solution according to the mass ratio of 5wt%, to make a glue solution, and it takes 4 hours. Mix 5g of inert lithium powder and 2.5g of conductive agent acetylene black for 15 minutes. Slowly add the mixture of inert lithium powder and conductive acetylene black to the glue and mix evenly to obtain lithium powder slurry. Lithium powder, binder and conductive agent are mixed according to 50:25:25 to obtain lithium powder slurry, which takes 45 minutes . Then coated on the surface of the current collector copper foil with a thickness of 30 μm, wherein the coating quality of the slurry is 3 mg / cm 2 (Based on the solid component mass not including the solvent), the calculated lithium powder loading capacity per unit area is 1.5mg / cm 2 , with a time of 20 minutes. Dry in a vacuum oven at 100°C for 2 hours, and ven...
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