Battery anode slurry, anode using same and battery manufacture method
A positive electrode slurry and positive electrode material technology, which is applied in electrode manufacturing, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of poor high-temperature storage performance and high-temperature cycle performance of batteries
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[0031] The preparation method of the negative electrode can adopt a conventional preparation method. For example, the negative electrode material can be mixed with a solvent, coated and / or filled on the conductive substrate, dried, rolled or not rolled to obtain the negative electrode. Wherein, the solvent can be selected from N-methylpyrrolidone (NMP), dimethylformamide (DMF), diethylformamide (DEF), dimethylsulfoxide (DMSO), tetrahydrofuran (THF) and One or more of water and alcohol. The amount of the solvent can make the paste have viscosity and fluidity, and it can be coated on the conductive substrate. Generally speaking, based on the weight of the negative electrode active material, the content of the solvent is 50-150% by weight, preferably 70-120% by weight. Among them, the methods and conditions of drying and calendering are well known to those skilled in the art. For example, the drying temperature is generally 100-150°C.
[0032] The non-aqueous electrolyte is a mixed s...
Embodiment 1
[0036] This embodiment illustrates the positive electrode slurry provided by the present invention and a method for preparing a positive electrode and a lithium ion battery from the positive electrode slurry.
[0037] (1) Preparation of positive electrode
[0038] 100 parts by weight of positive active material LiCoO 2 (D 50 Is 8 microns) and 4 parts by weight of conductive agent acetylene black are added to 50 parts by weight of non-polar solvent n-hexane and mixed uniformly to obtain the first mixture, and 4 parts by weight of binder polyvinylidene fluoride (PVDF) are added to 30 parts by weight of the polar solvent N-methylpyrrolidone (NMP) are uniformly mixed to obtain the second mixture, and then the first mixture and the second mixture are mixed and stirred in a vacuum mixer to form a uniform positive electrode slurry.
[0039] The slurry was evenly coated on an aluminum foil with a width of 400 mm and a thickness of 20 microns, and then dried at 135°C and rolled on a slitti...
Embodiment 2
[0046] This embodiment illustrates the positive electrode slurry provided by the present invention and a method for preparing a positive electrode and a lithium ion battery from the positive electrode slurry.
[0047] The positive electrode slurry, battery positive electrode and battery were prepared according to the same method as in Example 1, except that the non-polar solvent used in the preparation of the positive electrode slurry was a mixture of 60 parts by weight of n-hexane and 20 parts by weight of toluene. The polar solvent used for preparing the positive electrode slurry was 16 parts by weight of N-methylpyrrolidone (NMP), and the lithium ion secondary battery A2 was prepared.
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