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A preparation process, lithium battery technology, applied in secondary batteries, sustainable manufacturing/processing, secondary battery repair/maintenance, etc. Safety factor and energy density, saving space and cost, improving safety performance
Pending Publication Date: 2021-03-02
湖南省斯盛新能源有限责任公司
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The most prominent problems of polymer electrolytes are: most of the system is in a crystalline state at room temperature, and the conductivity is very low, which cannot meet the actual needs; it has poor compatibility with metal lithium electrodes, and it is easy to form a passivation film at the electrode / electrolyte interface. In the process of lithium deposition and dissolution, the current distribution is uneven, dendrites are formed, the capacitance of the electrode is reduced, and the cycle performance and electrical performance of the battery are affected; the preparation process is very complicated, and the solvents used are generally high-toxic and high-risk solvents, which cause environmental pollution. big, expensive
This method can increase the mechanical strength of the battery, and has a certain inhibitory effect on the expansion of the battery due to the internal adhesion effect, but the disadvantage is obvious: it cannot further meet the current growing lithium batteries, especially power batteries and consumer batteries. Density development requirements; it is still a conventional liquid free electrolyte, and the safety performance is still not guaranteed
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Embodiment 1
[0046] An embodiment of the present invention provides a preparation process for a gel lithium battery, comprising the following steps:
[0047] S100: By weight percentage, take 84.5% hexafluoropropylene-polyvinylidene fluoride copolymer, 5% cyclophosphazene derivative Add 10% aluminum oxide with a particle size of 10nm and 0.5% polyvinylpyrrolidone into a mixed solvent composed of 85% N-methylpyrrolidone, 10% acetone and 5% isopropanol, stir evenly at 45°C, and Disperse for 6 hrs to obtain a slurry. The solid component of the slurry accounts for 15%, and the solvent accounts for 85%.
[0048] S200: The pole rolls of the positive pole piece and the pole roll of the negative pole piece are respectively unwound at 6m / min, immersed in the slurry at 60°, and the surface of the other pole piece is coated with slurry coating, and then removed at 60°, and the coating is controlled. The thickness of the layer is 10 μm, and it is dried by gradient heating and blowing at 40°C, 50°C, 6...
Embodiment 2
[0052] An embodiment of the present invention provides a preparation process for a gel lithium battery, comprising the following steps:
[0053] S100: By weight percentage, take 84% hexafluoropropylene-polyvinylidene fluoride copolymer, 5% cyclophosphazene derivative Add 10% aluminum oxide with a particle size of 50nm and 1% polyvinylpyrrolidone to a mixed solvent composed of 85% N-methylpyrrolidone, 10% acetone and 5% isopropanol, stir evenly at 45°C, and Disperse for 6 hrs to obtain a slurry. The solid component of the slurry accounts for 1%, and the solvent accounts for 99%.
[0054] S200: The pole rolls of the positive pole piece and the pole roll of the negative pole piece are respectively unwound at 1m / min, immersed in the slurry at 10°, and the surface of the other pole piece is coated with slurry coating, and then removed at 10°, and the coating is controlled. The thickness of the layer is 2 μm, and it is dried by gradient heating and blowing at 10°C, 20°C, 30°C, 40°...
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Abstract
The invention is applicable to the technical field of lithium battery preparation, and provides a preparation process of a gel lithium battery, which comprises the following steps: forming slurry coatings on the surfaces of a positive pole piece and a negative pole piece in a manner of dip-coating the positive pole piece and the negative pole piece in a mixed solution containing a gel material, nano ceramic powder, a dispersing agent, a solvent and a flame-retardant additive; and enabling the coating to be subjected to vacuum baking to form a gel film to replace a lithium battery diaphragm inthe prior art, so that the energy density of the battery can be improved. After the composite positive pole piece and the composite negative pole piece are wound into a battery cell and electrolyte isinjected into the battery cell, multidimensional pores are formed, channels of lithium ions in a gel thin film are guaranteed, the electrolyte containing the flame-retardant additive is prepared, andthe safety performance of the battery can be improved by means of self-dissolution and extraction of the flame-retardant additive in the electrolyte. The gel films on the surfaces of the composite positive pole piece and the composite negative pole piece are formed into self-crosslinking at high temperature and high pressure to form a good reaction interface, so that the ionic conductivity of lithium ions in the gel films is ensured.
Description
technical field [0001] The invention belongs to the technical field of lithium battery preparation, and in particular relates to a preparation process of a gel lithium battery. Background technique [0002] At present, solid-state batteries in the lithium battery industry are divided into all-solid-state polymer batteries and semi-solid-state polymer batteries. The research on solid-state polymer electrolytes is the core technology for realizing plasticized thin-film lithium-ion batteries. [0003] All-solid-state polymer batteries generally use lithium salts, solvents, and doped, modified or copolymerized resin plastics to prepare solid-state electrolyte separators by extraction or phase inversion methods, and then place them between lithium battery electrodes as gel-state electrolytes. Thin films are then produced through conventional battery procedures. Gel electrolyte separators can also be formed by adding plasticizers or fillers. All-solid polymer electrolytes are us...
Claims
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Application Information
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