Preparation method of aqueous slurry for lithium ion battery

A lithium-ion battery, water-based slurry technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor conductivity of lithium iron phosphate, poor slurry stability, difficult slurry screening, etc., to reduce coating cost, material cost savings, the effect of reducing the solvent recovery process

Pending Publication Date: 2022-04-08
深圳市首通新能源科技有限公司
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Problems solved by technology

[0003] The existing lithium iron phosphate has poor conductivity, and graphene is added to the slurry, focusing on solving the dispersion of graphene and lithium iron phosphate
The slurry water-based binder is a non-Newtonian fluid, and the stability of the slurry is poor. After the slurry stops stirring, it quickly flocculates and becomes "jelly-like", with poor fluidity, and it is difficult to sieve the slurry.

Method used

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  • Preparation method of aqueous slurry for lithium ion battery
  • Preparation method of aqueous slurry for lithium ion battery
  • Preparation method of aqueous slurry for lithium ion battery

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preparation example Construction

[0024] The present invention provides a kind of preparation method of lithium-ion battery aqueous slurry, comprising the following steps:

[0025] Step 1, mix the binder and deionized water according to a given ratio and add it to the container, stir and mix for the first time and disperse for the first time to prepare a mixed slurry; the binder is an acrylic shell binder glue liquid. Wherein, the binder and deionized water can be mixed in a given weight ratio.

[0026] Step 2, adding a conductive agent to the mixed slurry in a given proportion and mixing, and then performing a second stirring and mixing and a second dispersion to prepare a conductive slurry; wherein, the conductive agent can be added to the mixed slurry in a weight ratio Mixing in the mixed slurry, for example, adding the conductive agent into the mixed slurry in proportion by weight (0.3-3%) and mixing.

[0027] Step 3, adding lithium-ion battery positive electrode materials to the conductive paste to form...

Embodiment 1

[0037] Example 1 as image 3 , Figure 4 As shown, according to production requirements, the prepared acrylic shell adhesive glue is added to a cleaned mixing tank, and the mixing equipment is a double planetary mixing equipment. Add an appropriate amount of deionized water, rotate at 20-30r / min, rotate at 2500-4000r / min, stir for 30-90min to prepare the glue with a solid content of 3-9%, add graphene conductive agent (conductive agent includes: graphene, CNTs slurry Material, SP, phosphorus flake graphite (such as KS-6), single-walled carbon tube slurry, and one or more of them are compounded, and then 20-30r / min revolution, 2500-5000r / min high-speed dispersion for 60-120min; Prepare conductive paste;

[0038]The active substance lithium iron phosphate is added, and the high-rate lithium cobalt oxide slurry formula is as follows: lithium iron phosphate: graphene: acrylic glue: chitosan: PVP: H2O = 95.2:1:1.8:1.0:46. Revolution 25~45r / min, rotation 3000~7000r / min, control t...

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Abstract

The invention discloses a lithium ion battery aqueous slurry preparation method, which comprises: 1, mixing a binder and deionized water according to a given ratio, stirring for the first time, and dispersing for the first time to prepare a mixed slurry; step 2, adding a conductive agent into the mixed slurry according to a given proportion, mixing, and carrying out second stirring and second dispersion to prepare conductive slurry; and 3, adding a lithium ion battery positive electrode material into the conductive slurry to form a mixture, carrying out third stirring and third dispersion on the mixture, controlling the solid content and viscosity of the conductive slurry, and adding a modifier and an additive to obtain the lithium ion battery aqueous slurry. The environment pollution risk of an organic solvent is eliminated, the solvent recovery process is reduced, the slurry preparation and post-process coating cost can be greatly reduced, and the NMP material cost, the solvent recovery equipment and the manufacturing cost are saved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery manufacturing, and in particular relates to a preparation method of lithium ion battery aqueous slurry. Background technique [0002] At present, N-methylpyrrolidone organic solvent is mainly used in the preparation of lithium-ion battery positive electrode slurry, but it has a pungent smell and certain toxicity. It will burn and corrode the skin when it comes into contact with the skin, and it will cause certain damage when inhaled. The organic solvent of the slurry needs to be recovered by professional equipment. If the recovery is improper, it will flow into the water body or soil, causing serious environmental pollution problems. Replacing organic solvents with deionized water is an environmentally friendly and clean solution, and the preparation of lithium-ion battery slurry is the future development direction of technology. With the rapid development of the electric vehicle indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62
Inventor 蒋俊宏邓文云
Owner 深圳市首通新能源科技有限公司
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