Aqueous cathode slurry of lithium iron phosphate battery and preparation method thereof

A lithium iron phosphate battery and positive electrode slurry technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problem of large specific surface area of ​​water-based composite graphene conductive paste, affecting the health of production workshop staff, and toxicity at the production site Large and other problems, to achieve the effect of improving high-power start-up performance, reducing ohmic internal resistance and polarization internal resistance, and good dispersion

Inactive Publication Date: 2021-03-05
SHENZHEN TOPBAND NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NMP is volatile, flammable, explosive, and highly toxic, which can easily cause serious environmental pollution, make the production site highly toxic, and seriously affect the health of the production workshop staff.
However, the water-based composite graphene conductive paste has a large specific surface area, which is prone to agglomeration and is not easy to disperse evenly in the solvent.

Method used

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  • Aqueous cathode slurry of lithium iron phosphate battery and preparation method thereof
  • Aqueous cathode slurry of lithium iron phosphate battery and preparation method thereof
  • Aqueous cathode slurry of lithium iron phosphate battery and preparation method thereof

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preparation example Construction

[0031] The preparation method of the aqueous cathode slurry of the lithium iron phosphate battery of the present invention may comprise the following steps:

[0032] S1. Mix the composite graphene conductive paste, water-based binder and deionized water, stir and glue, to obtain a mixed paste.

[0033] Among them, the water-based binder is made of water-based glue made of acrylonitrile multi-polymer, in which the acrylonitrile multi-polymer is used as a solute, and its content accounts for 16% by weight of the total amount of the water-based glue. The conductivity of the added deionized water is less than or equal to 1 μs / cm, and the amount of the added deionized water is such that the solid content of the obtained mixed slurry is 45-65 wt%.

[0034] The revolution of stirring and beating is 20~30rmp, and the speed of dispersion is 2500~4000rmp. Stirring time 60 ~ 120min.

[0035] S2. Kneading and stirring the lithium iron phosphate and the conductive agent to obtain a mixed...

Embodiment 1

[0043] (1), 1041.6g water-based adhesive ADY-701A (solid content is 16wt%), 485g water as solvent, 1587g composite graphene conductive paste (solid content is 6.3wt%) are mixed, put into Guangzhou Senhong mixer to Revolution speed 25rpm / min, dispersion speed 2500rpm / min and stir for 100min; measured viscosity was 3500mPa·s.

[0044] (2) Add 3000g of lithium iron phosphate active material and 66.6g of conductive agent SP into the Guangzhou Senhong mixer and stir for 180min at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min.

[0045](3), then add (1) the well-stirred glue into (2) the kneaded powder for two stages of adding and stirring: first add (1) 20% of the weight of the glue, a total of 622.9g, Stir the slurry at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min for 30min to achieve a pre-dispersed mud-like effect, then add (1) 80% of the weight of the glue solution, a total of 2491.5g, at a revolution speed of 50rpm / min, dispersio...

Embodiment 2

[0049] (1), mix 815.2g ADY-701A (solid content is 16wt%), 385.3g water as solvent, 1294g composite graphene conductive paste (solid content is 6.3wt%), put into Guangzhou Senhong mixer to revolution The speed is 25rpm / min, the dispersion speed is 2500rpm / min and stirred for 100min; the measured viscosity is 3400mPa·s.

[0050] (2) Add 3000g of lithium iron phosphate active material and 48.9g of conductive agent SP into the Morihiro mixer and stir for 180min at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min.

[0051] (3), add (1) the well-stirred glue into the above-mentioned (2) kneaded powder and carry out two-stage addition and stirring: first add (1): 20% of the weight of the glue is a total of 499g, Stir the slurry at a revolution speed of 15rpm / min and a dispersion speed of 1500rpm / min for 30min to achieve a pre-dispersed mud-like effect, then add (1) 80% of the weight of the glue 1995.6g at a revolution speed of 50rpm / min and a dispersion speed of ...

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Abstract

The invention discloses water-based positive electrode slurry of a lithium iron phosphate battery and a preparation method of the water-based positive electrode slurry. The water-based positive electrode slurry comprises the following raw materials in parts by weight: 90-93 parts of lithium iron phosphate, 2-3 parts of composite graphene conductive slurry, 3-5 parts of a water-based binder, 1-2 parts of a conductive agent and deionized water, wherein the viscosity of the aqueous positive electrode slurry is 3,000 mPa.s to 6,000 mPa.s. According to the water-based positive electrode slurry of the lithium iron phosphate battery, deionized water is used as a dispersion medium, so that the dispersity of the water-based positive electrode slurry is improved, environmental pollution caused by using an organic solvent is avoided, and the water-based positive electrode slurry is more environment-friendly and safer; in the components of the water-based positive electrode slurry, the contents ofthe conductive agent and the water-based binder are optimized, and meanwhile, the water-based graphene composite conductive slurry is used as the conductive agent, so that the ohmic internal resistance and polarization internal resistance of the battery can be reduced, and the high-power starting performance of the lithium battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an aqueous cathode slurry for a lithium iron phosphate battery and a preparation method thereof. Background technique [0002] Because lithium iron phosphate material has many advantages such as abundant raw material sources, environmental protection and non-toxicity, high working voltage, and good thermal stability, it is considered to be an ideal cathode material for a new generation of lithium-ion batteries. Lithium iron phosphate battery refers to a lithium ion battery using lithium iron phosphate as the positive electrode material. In addition to the positive electrode material, the positive electrode slurry of the lithium ion battery contains active materials, conductive agents, binders and solvents. Lithium iron phosphate lithium-ion battery has a wide range of application prospects in the field of power technology due to its high power density, long cycle li...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M4/04H01M10/0525
CPCH01M4/04H01M4/5825H01M4/622H01M4/625H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner SHENZHEN TOPBAND NEW ENERGY CO LTD
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