Conductive binder material and preparation method thereof, negative pole piece and lithium ion battery
A technology of conductive binder and raw materials, applied in non-aqueous electrolyte battery electrodes, batteries, negative electrodes, etc., can solve the problems of poor conductivity, bonding failure, and easy pulverization of silicon-based materials, and achieves alleviation of pulverization and mitigation. Bond failure, high bond strength
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[0051] Example 1
[0052] S1) Preparation of Binder Material A1:
[0053] Prepare 10ml of 5% polyvinyl alcohol aqueous solution, put the polyvinyl alcohol aqueous solution into a 50ml polytetrafluoroethylene-lined hydrothermal kettle, place the hydrothermal kettle in a 160°C oven, take it out after 6 hours, and place it in the air to cool naturally , that is, to obtain the binder material, denoted as A1.
[0054] S2) Production of pole piece N1:
[0055] Mix 1 mass part of A1 and 9 mass parts of active material nano-silicon with a mortar, add 0.2 ml of deionized water to obtain a negative electrode slurry, coat the negative electrode slurry on the copper foil, and the solid coating quality is 1mg / cm 2 , then dried in a vacuum drying oven at 100°C for 12 hours, cut into pieces, weighed, and the obtained pole pieces were recorded as N1.
[0056] S3) Preparation of Li-ion Half Cell C1:
[0057] The diaphragm is a 25μm polypropylene film;
[0058] The electrolyte consists of...
Example Embodiment
[0060] Example 2
[0061] S1) preparation of binder material A2:
[0062] Prepare 10ml 8% polyvinyl alcohol aqueous solution, put the polyvinyl alcohol aqueous solution into a 100ml polytetrafluoroethylene-lined hydrothermal kettle, place the hydrothermal kettle in a 200°C oven, take it out after 24 hours, and place it in the air to cool naturally , that is, the binder material is obtained, denoted as A2.
[0063] S2) Production of pole piece N2:
[0064] Mix 1 mass part of A2 and 9 mass parts of active material nano-silicon with a mortar, add 0.2 ml of deionized water to obtain a negative electrode slurry, and coat the negative electrode slurry on the copper foil, the solid coating quality is 1mg / cm 2 , and then dried in a vacuum drying oven at 100°C for 12 hours, cut into pieces, weighed, and the obtained pole pieces were recorded as N2.
[0065] S3) Preparation of Li-ion Half Cell C2:
[0066] The diaphragm is a 25μm polypropylene film;
[0067] The electrolyte consis...
Example Embodiment
[0069] Example 3
[0070] S1) preparation of binder material A3:
[0071] Prepare 50ml of 20% polyvinyl alcohol aqueous solution, put the polyvinyl alcohol aqueous solution into a 200ml polytetrafluoroethylene-lined hydrothermal kettle, place the hydrothermal kettle in a 250°C oven, take it out after 12 hours, and place it in the air for natural cooling , that is, the binder material is obtained, denoted as A3.
[0072] S2) Production of pole piece N3:
[0073] Mix 1 mass part of A3 and 9 mass parts of active material nano-silicon with a mortar, and add 0.2 ml of deionized water to obtain a negative electrode slurry. The negative electrode slurry is coated on the copper foil, and the solid coating quality is 1mg / cm 2 , and then dried in a vacuum drying oven at 100 °C for 12 hours, cut into pieces, weighed, and the obtained pole pieces were recorded as N3.
[0074] S3) Preparation of Li-ion Half Cell C3:
[0075] The diaphragm is a 25μm polypropylene film;
[0076] The el...
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