Production method of positive pole piece, production method of battery, positive pole piece and battery
A positive electrode sheet and positive electrode technology, which is applied in the field of secondary lithium-ion batteries, can solve the problems such as the increase of internal resistance is no longer obvious, and achieve the effects of good sustainability, easy expansion of production, and increased ion conductivity
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[0037] A method for preparing a positive pole piece, comprising the steps of:
[0038] Step 1, heating and dissolving the positive electrode binder in the NMP solvent at a ratio of 5% to 10%, at a heating temperature of 50°C to 80°C, to prepare the positive electrode glue;
[0039]Step 2: Add a conductive agent in the proportion of 2% to 15% to the positive gel, and stir for more than 2 hours; then add an ion conductive agent in a proportion of 2% to 15%, and stir for more than 2 hours, and the stirring temperature is 25°C to 60°C. Preparation of conductive agent and ion conductive agent slurry;
[0040] Step 3: Add positive electrode material to the above slurry at a ratio of 70% to 95%, and stir for more than 12 hours at a stirring temperature of 25°C to 60°C to prepare positive electrode slurry;
[0041] Step 4: Use coating equipment to coat the positive electrode according to a certain coating amount, the coating speed is 3m / min-10m / min, and the drying temperature is 85°C...
Embodiment 1
[0056] Prepare positive electrode glue: add 1kg of positive electrode binder PVDF to 19kg of NMP solvent, heat and dissolve at 50-80°C, stir for more than 2 hours, and prepare 5% positive electrode glue;
[0057] Slurry homogenization: Take 20kg of positive electrode glue, add 1kg of conductive carbon black Super P Li, 1kg of vapor-phase grown carbon fiber VGCF, stir for more than 2 hours; finally add the positive electrode material LiCoO 2 45kg, stirred at room temperature for more than 10h to obtain positive electrode slurry;
[0058] Coating: use coating equipment to coat the positive electrode according to a certain coating amount, the coating speed is 8m / min, and the drying temperature is 120°C to prepare the positive electrode sheet.
[0059] Battery assembly: roll the dried positive pole piece and cut it to prepare the positive pole piece; use the same method to prepare the negative pole piece; use a separator of certain thickness and material to cover the positive pol...
Embodiment 2
[0061] Prepare positive electrode glue: add 1kg of positive electrode binder PVDF to 19kg of NMP solvent, heat and dissolve at 50-80°C, stir for more than 2 hours, and prepare 5% positive electrode glue;
[0062] Slurry homogenization: Take 20kg of positive gel, add 1kg of conductive carbon black Super P Li, 1kg of vapor-phase grown carbon fiber VGCF, stir for more than 2 hours; then add 2kg of solid electrolyte Li 7 La 3 Zr 2 o 12 (LLZO), stirred for more than 2h, and finally added the positive electrode material LiCoO 2 45kg, stirred at room temperature for more than 10h to obtain positive electrode slurry;
[0063] Coating: use coating equipment to coat the positive electrode according to a certain coating amount, the coating speed is 8m / min, and the drying temperature is 120°C to prepare the positive electrode sheet.
[0064] Battery assembly: roll the dried positive pole piece and cut it to prepare the positive pole piece; use the same method to prepare the negative ...
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