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Positive electrode slurry, positive electrode plate and lithium ion battery

A technology of positive electrode slurry and positive electrode sheet, applied in the direction of positive electrode, battery electrode, secondary battery, etc., can solve the problems of abnormal production, brittle electrode sheet, and electrode sheet winding, etc., and achieve the reduction of burr probability and flexibility The effect of increasing the softening temperature and reducing the embrittlement temperature

Inactive Publication Date: 2021-07-27
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing positive electrode slurry generally contains positive electrode active materials, binders and conductive agents. After this type of positive electrode slurry is coated, if the compaction density is too large, the electrode sheet may become brittle, and the electrode sheet will be wound and processed. The broken belt is serious and cannot be produced normally

Method used

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  • Positive electrode slurry, positive electrode plate and lithium ion battery
  • Positive electrode slurry, positive electrode plate and lithium ion battery
  • Positive electrode slurry, positive electrode plate and lithium ion battery

Examples

Experimental program
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Embodiment 1

[0050] This embodiment provides a positive electrode slurry, which includes 0.1 kg of PVDF, 0.026 kg of carbon nanotubes, 0.03 kg of conductive carbon black, 5 kg of ternary nickel-cobalt-manganese positive electrode materials, and 0.03 kg of lithium bistrifluoromethanesulfonimide.

[0051] The preparation steps of the positive electrode slurry of the present embodiment include:

[0052] Step S1: dissolving 0.1kg PVDF in the organic solvent N-methylpyrrolidone in a mechanical stirring device to obtain a glue solution, the solid content of the glue solution is 4.35wt%.

[0053] Step S2: Add the dispersion containing 0.026kg of carbon nanotubes and 0.03kg of conductive carbon black to the glue solution in step S1, and stir under a vacuum of -0.095MPa to obtain a uniformly dispersed conductive paste. Among them, the rotation speed of stirring was 4500 rpm, and the revolution speed was 25 rpm.

[0054] Step S3: Add 5 kg of ternary nickel-cobalt-manganese cathode material to the c...

Embodiment 2～ Embodiment 6

[0059] Embodiments 2 to 6 provide a positive electrode slurry and a preparation method thereof. Compared with Example 1, the only difference is that the positive electrode slurry of Examples 2 to 6 has a ternary nickel-cobalt-manganese positive electrode material and a double The amount of lithium trifluoromethanesulfonyl imide is different from Example 1, and its amount is recorded in Table 1.

[0060] Embodiments 2 to 6 also provide a positive electrode sheet and a preparation method thereof. Compared with embodiment 1, the only difference is that the compacted density of the positive electrode sheet in embodiments 2 to 6 is different from that of embodiment 1. , and their compacted densities are recorded in Table 1.

Embodiment 7

[0062] Example 7 provides a positive electrode slurry and a preparation method thereof. Compared with Example 1, the only difference is that lithium bistrifluoromethanesulfonimide is replaced by lithium difluorooxalate borate. In this example, The amount of lithium difluorooxalate borate is the same as the amount of lithium bistrifluoromethanesulfonimide in Example 1.

[0063] Example 7 also provides a positive electrode sheet and a preparation method thereof. Compared with Example 1, the only difference is that this example uses the positive electrode slurry of Example 7 for coating.

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Abstract

The invention discloses positive electrode slurry, a positive plate and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The positive electrode slurry comprises a positive electrode active material, an adhesive and a conductive agent. The positive electrode slurry also comprises an auxiliary agent, the auxiliary agent is a lithium salt, and the lithium salt meets the following condition: the ratio of the crystallinity of an adhesive film formed by the lithium salt and the adhesive to the crystallinity of the adhesive film formed by the adhesive is less than 0.8. The positive plate comprises a thin film layer formed by positive slurry. The flexibility of the positive plate can be improved, and the pole plate is not easy to embrittle under the condition of relatively high compaction density.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, in particular, to a positive electrode slurry, a positive electrode sheet and a lithium ion battery. Background technique [0002] After the slurry is coated on the lithium-ion battery pole piece, it needs to be rolled. The main purpose of the roll pressure is as follows: 1) Ensure the surface of the pole piece is smooth and flat, and prevent the particles and burrs on the coating surface from piercing the diaphragm and causing short circuit ; 2) Rolling and compacting the pole piece coating material reduces the volume of the pole piece and increases the energy density per unit volume of the battery; 3) Makes the active material and conductive agent particles contact more closely and improves the electronic conductivity; 4) Strengthens the coating The combination strength of the material and the current collector reduces the occurrence of loose powder falling during the cu...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M4/131H01M10/0525
CPCH01M4/62H01M4/621H01M4/13H01M4/131H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张博张国军刘永飞梁世硕
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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