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Preparation method of lithium iron phosphate positive electrode slurry of lithium ion battery
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A lithium-ion battery, lithium iron phosphate technology, applied in battery electrodes, positive electrodes, secondary batteries, etc.
Inactive Publication Date: 2021-08-24
江西安驰新能源科技有限公司
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[0013] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a lithium iron phosphate positive electrode slurry preparation method for lithium ion batteries, reduce the problem of excessive stirring resistance of the equipment due to uneven distribution of the initial solvent in the slurry mixing process, and avoid equipment loss , and at the same time improve the efficiency of solvent penetration in the powder, improve the efficiency of slurry mixing, thereby improving production efficiency
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[0041] S1. Add 95 parts of lithium iron phosphate, 3 parts of carbon black, and 2 parts of PVDF into a 100L powder tank, stir in the forward direction, set the speed at 30RPM, set the dispersion at 300RPM, and run for 30 minutes;
[0042] S2. Add solvent NMP of 24% of the total weight of the dry powder, stir and rotate in reverse, set the speed at 25RPM, set the dispersion at 100RPM, and run for 15min;
[0043] S3. Add solvent NMP of 15% of the total weight of the mixture after the stirring and dispersion in step S2 is completed, stir in the forward direction, set the speed at 20RPM, set the dispersion at 150RPM, and run for 45min;
[0044] S4. Add 13% solvent NMP of the total weight of the mixture after the stirring and dispersion in step S3 is completed, stir in the forward direction, set the speed at 25RPM, set the dispersion at 1000RPM,...
Embodiment 2
[0047] A preparation method of lithium iron phosphate positive electrode slurry for lithium ion battery, comprising the following steps:
[0048] S1. Add 95 parts of lithium iron phosphate, 3 parts of carbon black, and 2 parts of PVDF into a 100L powder tank, stir in the forward direction, set the speed at 30RPM, set the dispersion at 300RPM, and run for 30 minutes;
[0049] S2. Add solvent NMP of 12% of the total weight of the dry powder, stir and rotate in reverse, set the speed at 25RPM, set the dispersion at 100RPM, and run for 15min;
[0050] S3. Add solvent NMP of 12% of the total weight of the dry powder, stir and rotate in reverse, set the speed at 25RPM, set the dispersion at 100RPM, and run for 15min;
[0051] S4. Add 15% solvent NMP of the total weight of the mixture after the stirring and dispersion in step S3 is completed, stir in the forward direction, set the speed at 20RPM, set the dispersion at 50RPM, and run for 30min;
[0052] S5. Add 13% solvent NMP of the...
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Abstract
The invention belongs to the technical field of lithiumion batteries, and particularly relates to a preparation method of lithiumion battery lithiumiron phosphate positive electrodeslurry, which comprises the following steps: adjusting a solvent required to be added for primary kneading into clusters to be added in two or more times, wherein stirring modes are different after the solvent is added for the first time, and reversing to turn over powder and scatter the clustered powder, so that the stirring resistance is reduced, and the rapid diffusion of the solvent in the powder is improved; and further subdividing the addition amount of the first solvent and the second solvent into multiple times, so that diffusion of the solvents in the powder is better facilitated, the small bulk powder is added twice or more step by step, the number of bulk particles is gradually reduced along with increase of the number of the added solvents, a large bulk mixture is formed, the kneading effect is better, and the resistance and the loss borne by the equipment are smaller.
Description
technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for preparing lithium iron phosphatecathodeslurry for lithium ion batteries. Background technique [0002] The preparation methods of lithium iron phosphatecathodeslurry for lithium ion batteries are usually divided into dry slurry mixing and wet slurry mixing. Among them, the dry pulping process usually uses the powder to be put into the premix at one time, and the solvent is added in two or three times. The solvent is added for the first time to wet the powder into a dough shape, and the mixing equipment is used to knead and extrude it to achieve broken particles. A preliminary dispersion state is formed, and this process is usually called the kneading process; after the second and third solvent additions, the fluidity of the powder after kneading is improved, and the final mixed and uniform slurry form is obtained by stirring and high-spe...
Claims
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Application Information
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