Battery pole piece and preparation method thereof, battery cell and battery

A battery pole piece and cell technology, which is applied in battery electrodes, electrode manufacturing, electrode collector coating, etc., can solve the negative impact of battery cycle and rate performance, reduce the compaction density of battery pole pieces, and increase the gas permeability of the separator. and other problems, to achieve good electrophilic performance, improve the ability to absorb electrolyte, and eliminate the effect of softening the cell

Active Publication Date: 2021-05-18
余姚市海泰贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, by setting the electrolyte diversion groove on the battery pole piece, the diffusion path of the electrolyte ions is increased, thereby improving the absorption uniformity and absorption capacity of the battery pole piece to the electrolyte, but the diversion groove on the battery pole piece will reduce the battery life. The compaction density of the pole piece, and when the pole piece passes through the rolling process, the shape of the diversion groove will change due to the pressure of the roller, and the diversion effect will be greatly reduced. Therefore, the benefit of this method is limited
There is also a water-based glue-coated diaphragm prepared by rotary spraying to improve the liquid absorption capacity of the diaphragm. Although this method can increase the electrolyte retention of the battery to a certain extent, the diaphragm coating will increase the air permeability of the diaphragm. To a certain extent, it will hinder the transmission of lithium ions and have a negative impact on the cycle and rate performance of the battery

Method used

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  • Battery pole piece and preparation method thereof, battery cell and battery
  • Battery pole piece and preparation method thereof, battery cell and battery
  • Battery pole piece and preparation method thereof, battery cell and battery

Examples

Experimental program
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preparation example Construction

[0049] Another embodiment of the present invention provides a method for preparing a battery pole piece, comprising the following steps:

[0050] A current collector is provided, and the surface of the current collector has a first coating area and a second coating area surrounding the first coating area; the first coating area is coated to form an active material coating, and the second coating area is coated Form a liquid-absorbent coating; wherein, the liquid-absorbent coating contains liquid-retaining additives, and the liquid-retaining additives are selected from the blend powder of nitrile and polyvinyl chloride, polypropylene micropowder, ultra-high molecular weight polyethylene powder and linear crystalline At least one of the polyvinylidene fluoride polymers.

[0051] In one embodiment, the raw materials of the paint forming the liquid-absorbing coating include 85-100.8 parts by weight of liquid-retaining additives, 65-89 parts by weight of ceramic microsphere powder,...

Embodiment 1

[0077] 1. Preparation of absorbent coating:

[0078] Boehmite microsphere powder, N-methylpyrrolidone, sodium carboxymethyl cellulose, linear crystalline polyvinylidene fluoride polymer and γ-methacryloxypropyltrimethoxysilane were mixed in a mass ratio of 7.7 : 5.8: 0.8: 9.3: 0.03 into the homogenizer mixer, the order of addition is to first add N-methylpyrrolidone, sodium carboxymethyl cellulose and linear crystalline polyvinylidene fluoride polymer into the mixer, with a revolution of 10r / Min, rotate at 150r / min and stir for 50min, then add boehmite microsphere powder and γ-methacryloxypropyltrimethoxysilane to the mixer, vacuumize to -90KPa, continue stirring at the same speed for 210min, After the uniformly dispersed high liquid absorption coating is obtained, the coating is placed in a transfer tank and stirred at a low speed of 15r / min for later use.

[0079] 2. Preparation of positive pole piece and negative pole piece

[0080] Apply the positive electrode active ma...

Embodiment 2

[0085]Example 2 is basically the same as Example 1, except that in the liquid-absorbing coating of Example 2, boehmite microsphere powder, N-methylpyrrolidone, sodium carboxymethylcellulose, and linear crystalline polyvinylidene fluoride The mass ratio of polymer to γ-methacryloxypropyltrimethoxysilane is 8.9:7.7:1.3:8.5:0.05.

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Abstract

The invention relates to a battery pole piece and a preparation method thereof, a battery cell and a battery. The battery pole piece includes a current collector and an active material coating and a liquid-absorbing coating arranged on the same surface of the current collector. A liquid coating is arranged around the active material coating; the liquid-absorbing coating contains a liquid-retaining additive selected from the blend powder of nitrile and polyvinyl chloride, polypropylene micropowder, ultra-high molecular weight At least one of polyethylene powder and linear crystalline polyvinylidene fluoride polymer. The battery pole piece of the present invention can improve the battery's ability to absorb electrolyte by providing a liquid-absorbing coating around the active material coating, and the cycle performance and rate performance of the battery are not affected.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery pole piece, a preparation method thereof, a battery cell and a battery. Background technique [0002] In recent years, with the rapid development of portable electronic products, electric vehicles, and energy storage power stations, lithium-ion batteries have become the preferred chemical power sources due to their high energy density, high operating voltage, small self-discharge, and long cycle life. With the upgrading of products, people have higher and higher requirements for the energy density of lithium-ion batteries, such as the improvement of battery capacity, the increase of battery cycle life and the improvement of battery safety performance. Soft-pack lithium-ion batteries are currently a major type of battery used in the field of electric vehicles. The electrolyte content in soft-pack lithium-ion batteries has a great impact on the cycle performance and rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/0525
CPCH01M4/0404H01M4/13H01M4/139H01M10/0525Y02E60/10
Inventor 李景夫易四勇林琳任超
Owner 余姚市海泰贸易有限公司
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