A method for direct recovery and reuse of lithium iron phosphate in lithium iron phosphate waste batteries
A lithium iron phosphate battery and lithium iron phosphate technology, which is applied in the field of direct recycling and reuse of lithium iron phosphate in waste lithium iron phosphate batteries, can solve the problem of losing price advantages, having no practical significance, and complicating the process of recycling and preparing lithium iron phosphate, etc. Problems, to achieve ideal recycling and regeneration effects, convenient battery assembly, and less reagents
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Embodiment 1
[0051] 1) Firstly, after the recycled lithium iron phosphate waste battery is fully discharged to 1V, the battery is disassembled, and the positive pole piece (content of lithium iron phosphate: 85.0wt%) is obtained by separation;
[0052] 2) Wash the waste positive electrode sheet three times with dimethyl carbonate DMC, remove the residual electrolyte on the positive electrode sheet, and then dry it in a vacuum oven at 80°C;
[0053] 3) Die-cutting of the positive electrode sheet;
[0054] 4) Preparation of functional lithium-replenishing separator by double-layer co-extrusion extrusion process:
[0055] In S1, 40 parts of Li with an average particle size of 200nm 5 FeO 4 , 45 parts of polypropylene with a melting point of 3.1g / 10min, 15 parts of toughening agent EVA in a high-speed mixer at a speed of 600r / min, and stirred for 40min to pre-mix until uniform;
[0056] S2 Add the mixture obtained in step S1) and polypropylene with a melt index of 3.1g / 10min to the extruder...
Embodiment 2
[0063] The rest are the same as in Example 1, except that the cold drawing ratio is 1.5, and the stretching rate is 0.05m / min, step 4) the hot drawing ratio is 2.2, and the stretching speed is 0.25m / min, and the finally obtained lithium supplement The layer thickness was 10 μm, and the base film layer thickness was 15 μm.
Embodiment 3
[0065] The rest are the same as in Example 1, except that the cold drawing ratio of step S3 is 1.2, and the stretching rate is 0.05m / min, and the hot drawing ratio of step S4 is 1.8, and the stretching speed is 0.20m / min, and the finally obtained complementary The thickness of the lithium layer is 15 μm, and the thickness of the base film layer is 10 μm.
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