Lithium battery positive pole slurry containing Ketjen superconducting carbon black, as well as preparation method and application thereof

Abstract

The invention discloses lithium battery positive pole slurry containing Ketjen superconducting carbon black, as well as a preparation method and application thereof. The lithium battery positive pole slurry comprises the following components in parts by weight: 80 parts of lithium iron phosphate positive pole active material, 1-10 parts of Ketjen superconducting carbon black, 5-20 parts of polyvinylidene fluoride, and 500-1100 parts of N-methyl-2-pyrrolidone. The preparation method comprises the following steps of: mixing and dispersing the Ketjen superconducting carbon black and polyvinylidene fluoride bonder bonder, then adding the lithium iron phosphate positive pole active material, mixing and dispersing, pouring the slurry into a sand mill to be milled, and obtaining the lithium battery positive pole slurry containing the Ketjen superconducting carbon black. According to the invention, the problem that a pole piece is dropped off because the lithium battery positive pole slurry uses the Ketjen superconducting carbon black is solved, the dosage of conductive additive is small, the dried positive pole material is not easy to drop off, and the specific capacity of the lithium battery material is improved.

Description

technical field [0001] The invention relates to a lithium battery cathode slurry containing Ketjen superconducting carbon black, a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the characteristics of high energy, long life, low pollution, light weight, long life, and no memory effect, and are currently widely used as power sources for portable electronic devices. [0003] An important step in preparing the positive electrode of lithium-ion batteries is the preparation of positive electrode slurry, which is a complex system containing positive active materials, conductive agents, binders and solvents. The complex system of positive electrode slurry is in a metastable state, and abnormal phenomena such as flocculation, segregation, and precipitation are prone to occur. [0004] Most of the conductive agents used in the currently disclosed lithium ion positive electrode slurry use acetylene black or graphite, etc. Ketjen s...

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Problems solved by technology

[0005] However, if the traditional stirring method is adopted, that is, the powders such as conductive agent and active material are premixed, and then the binder solution is added to stir, so that the dried positive electrode sheet containing Ketjen superconducting carbon black is easy to fall off, so it is rarely used. Ketjen superconducting carbon black as conductive agent