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Electrode plate as well as preparation method and application thereof

A technology of electrode pole piece and electrode active material, which is applied in the direction of electrode manufacturing, battery electrode, electrolyte storage battery manufacturing, etc., and can solve the problems of high rolling efficiency and low efficiency, easy generation of air bubbles, large fluctuations in coating surface density, etc.

Pending Publication Date: 2022-04-08
SINOCHEM INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the double-layer coating method of the above-mentioned prior art electrode sheet, the structure is very complicated, the density of the coating surface fluctuates greatly, and air bubbles are likely to be generated during the coating process, which requires high coating equipment. Since it needs to be coated twice, the coating The efficiency and efficiency are low, and it needs to be rolled twice at the same time, and the efficiency and efficiency of rolling are low

Method used

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  • Electrode plate as well as preparation method and application thereof
  • Electrode plate as well as preparation method and application thereof
  • Electrode plate as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] 1. Preparation of positive electrode sheet

[0092] (1) Firstly, 30g of PVDF, 40g of conductive carbon black SP and 500g of lithium iron phosphate cathode material are completely dissolved in 850g of NMP, and stirred in vacuum until the slurry is uniform; then the slurry is evenly coated on both surfaces of the aluminum foil;

[0093] (2) Vacuum-dry the coated electrode sheet at 120°C for 1 hour, and roll the dried positive electrode sheet at a pressure of 40 MPa to obtain a compacted density of 2.4 g / cm 3 positive pole piece.

[0094] 2. Preparation of negative electrode sheet

[0095] (1) 10g CMC, 15g SBR, 25g conductive carbon black SP and 500g tap density are 1.0g / cm 3 The graphite negative active material of graphite is completely dissolved in 800g high-purity water (moisture is removed, and active material content is 90.9%), and vacuum stirring is until the slurry is even, obtains the first material region slurry; 10g CMC, 15g SBR, 25g conductive carbon black SP...

Embodiment 2

[0101] The positive pole piece, the negative pole piece and the battery were prepared by the same process as in Example 1, with the difference that the coating width of the second material area of ​​the negative pole was 500 mm on one side. The compacted densities of the first and second material regions of the negative electrode are the same as those of the corresponding material regions in Example 1.

Embodiment 3

[0103] The positive electrode sheet, the negative electrode sheet and the battery were prepared by the same procedure as in Example 1, with the difference that the coating width of the second material area of ​​the negative electrode was 1000 mm on one side. The compacted densities of the first and second material regions of the negative electrode are the same as those of the corresponding material regions in Example 1.

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Abstract

The invention discloses an electrode pole piece which comprises a conductive current collector and an active material layer which is arranged on at least one surface of the conductive current collector and contains an electrode active substance, the active material layer comprises a first material region extending along the length direction of the conductive current collector and a second material region arranged on at least one side of the first material region, and the density of the second material region is greater than that of the first material region. According to the electrode plate, the electrolyte infiltration efficiency and the cycle performance of the battery cell can be improved.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to an electrode pole piece, a preparation method and application thereof. Background technique [0002] As the energy density requirements of lithium-ion batteries are getting higher and higher, the coating weight of electrode sheets is getting thicker and thicker, but as the cycle progresses, the expansion of negative electrode sheets is increasing, and the pressure between the electrodes makes the electrolyte infiltration gradually Deterioration, resulting in deterioration of battery cycle life. [0003] CN 111430658 A has developed a pole piece with a double-layer structure, specifically as follows: an electrode pole piece, including a conductive current collector, a first material layer and a second material layer, and the first material layer is arranged on the surface of the conductive current collector , the second material layer is arranged on the surface of the...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/058H01M4/04
CPCY02P70/50
Inventor 田中华
Owner SINOCHEM INT CORP