Safe lithium ion battery with good cyclic performance
A technology for ion batteries and safe lithium, which is applied in the direction of secondary batteries, battery electrodes, battery pack components, etc., can solve the problems of contact short circuit, scratches or punctures of positive and negative electrodes, and achieve the purpose of suppressing pulverization and improving retention Electrode stabilization and improvement of cycle performance
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[0021] The present invention will be described in detail below by way of examples.
[0022] Mix 10 parts of polymer polyvinylidene fluoride and 20 parts of solvent N-methylpyrrolidone and stir the solution at 60°C, add 8 parts of aluminum oxide with an average diameter of 2 μm and 5 parts of volatile additive n-butanol , high-speed stirring to disperse the flame retardant and volatile additives evenly. The coating solution was coated on the upper and lower surfaces of the positive electrode and the negative electrode by coating, and the coating thickness was 8 μm. The pole piece was baked in a vacuum oven at 95° C. for 2 hours to remove the N-methylpyrrolidone solvent and volatile additives to obtain a polymer carrier coating with a thickness of 5 μm. The weight ratio of aluminum oxide in the polymer washcoat is 45%. The polyethylene separator, the positive electrode sheet and the negative electrode sheet are stacked or wound into a battery core in the order of the separator...
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