Microcapsule, preparation method thereof, and lithium ion battery
A technology of lithium-ion batteries and microcapsules, which is applied in battery electrodes, secondary batteries, secondary battery repair/maintenance, etc. It can solve the adverse effects of increasing the internal resistance of the isolation film, battery rate performance and low-temperature performance, and affecting lithium ion transmission. And other issues
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[0039] The application also provides a method for preparing microcapsules, comprising the following steps:
[0040] A) mixing a polymer material, a flame retardant and an organic solvent to obtain an emulsion;
[0041] B) performing centrifugal spray drying on the emulsion in a centrifugal spray dryer to obtain microcapsules;
[0042] The flame retardant is selected from one or more of organic flame retardants and inorganic flame retardants;
[0043] The centrifugal spray dryer includes a centrifugal disc, a porous fence and a powder collector. The porous fence is arranged between the centrifugal disc and the powder collector. hole.
[0044] In the process of preparing microcapsules, the polymer material, flame retardant and organic solvent are first mixed to form an emulsion; in this process, the organic solvent is selected from acetone, ethanol, dimethyl carbonate, tetrahydrofuran and tetralin one or more. The solid content of the emulsion is 20wt%-75wt%, and in a specif...
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[0066] Example 1
[0067] 1) Preparation of microcapsules: Add ammonium polyphosphate or hexaphenoxycyclotriphosphazene powder particles into ethylene-vinyl acetate copolymer emulsion at a mass ratio of 4:6, and stir evenly in a disperser to obtain a solid content of 60 % to 65% of the emulsion, and finally the above-mentioned emulsion is centrifugally spray-dried to make ammonium polyphosphate and hexaphenoxycyclotriphosphazene as the capsule core and ethylene-vinyl acetate copolymer as the capsule shell with dual-core microcapsules (such as signal figure 1 as shown, figure 1 1 is the capsule shell part, 2 is the capsule core part, such as Figure 12 as shown, Figure 12 Electron micrograph of the microcapsule prepared for this embodiment);
[0068] 2) Preparation of safety paint: the microcapsules containing inorganic flame retardants and organic flame retardants prepared in the above steps are mixed with ceramic powder, acrylic emulsion, binder, surfactant and solvent a...
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[0072] Example 2
[0073] The difference from Example 1 is that the weight ratios of microcapsules, boehmite, acrylic emulsion, binder and surfactant in the safety coating are 55%, 42.1%, 1%, 1%, and 0.9%.
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