A kind of water-based binder, its preparation method, and application
A water-based adhesive and modification technology, applied in the field of lithium ion batteries, can solve the problems of inability to meet the requirements of positive electrode sheets, poor alkali resistance, low adhesion, etc., to eliminate gelation, enhance adhesion, The effect of low manufacturing cost
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preparation Embodiment 1
[0062] In a 5L pressure-resistant reactor, add 500g of polyvinyl alcohol 1799 (polymerization degree 1700, degree of alcoholysis 99%) and 1.5kg of dimethylacetamide (DMAc) solvent, stir at a speed of 200 rpm and The temperature was raised to 80°C. Oxygen was evacuated by high-purity nitrogen, and after stirring for 1 hour, the polyvinyl alcohol was completely dissolved in the DMAc solvent. At the same time, 110 g of maleic anhydride was dissolved with 200 g of DMAc to obtain a solution of maleic anhydride. Then, the solution of maleic anhydride was gradually and continuously added dropwise to the polyvinyl alcohol solution, and the dropwise addition was completed within 4 hours. With the addition of maleic anhydride, the color in the reaction kettle gradually changed from transparent to light brown. After continuing the heat preservation reaction for 1 hour, the temperature was raised to 100°C for 2 hours, and the heating was stopped, and the reaction temperature was lowered ...
preparation Embodiment 2-15
[0065] In addition to changing the polyvinyl alcohol and the cyclic dianhydride reactant used (the molar ratio of the hydroxyl group in the polyvinyl alcohol to the anhydride reactant is 10:1) as in the following Table 1, the same method as in Preparation Example 1 Prepare modified binder solid powder.
[0066] Table 1
[0067]
[0068]
Embodiment 1
[0070] Embodiment 1: the preparation of lithium ion battery
[0071] 1) The modified binder solid prepared in Preparation Example 1 was dissolved in deionized water to prepare an aqueous binder with a mass solid content of 10%.
[0072] 2) 0.98 parts by weight of NCM811 (gram capacity 191mAh / g) active material, 0.008 parts by weight of conductive agent carbon black (SP) and 0.012 parts by weight of the water-based binder prepared above (parts by weight are based on solid content after drying (meter) and mix, gradually add deionized water to carry out high-speed grinding to synthesize the slurry, adjust the solid content to 50%, evenly spread on the aluminum foil, dry and compact to obtain the positive electrode sheet; its surface density is set to 330g / m 2 , compacted density 3.5g / cm 3 .
[0073] 3) 0.96 parts by weight of artificial graphite (gram capacity 350mAh / g) active material, 0.01 parts by weight of conductive agent (SP), 0.012 parts by weight of CMC and 0.018 parts ...
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