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

A technology for battery pole pieces and positive pole pieces, which is applied in the direction of electrode manufacturing, battery electrodes, electrode collector coatings, etc., can solve problems such as battery failure, unfavorable battery cycle and rate performance, and achieve improved safety performance, suitable for The effect of large-scale promotion and prevention of thermal runaway

Active Publication Date: 2019-08-20
SOUNDON NEW ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, by adding anti-overcharge additives and film-forming agents to the electrolyte, multiple protective films are formed on the surface of the battery electrodes to reduce the risk of battery overcharge and thermal runaway. Although this method can achieve the purpose of preventing overcharge, the protection The formation of the film increases the internal resistance of the battery during normal operation, which is not conducive to the cycle and rate performance of the battery; the modified polyolefin diaphragm is used inside the battery, and when the thermal runaway occurs inside the battery, the pores of the modified polyolefin diaphragm will thermally expand and close. Cut off the chemical reaction at the thermal runaway, so that the thermal runaway will no longer occur. Although this method can control the thermal runaway to a certain extent, when the thermal runaway occurs, the diaphragm will form closed pores, which means that the battery will fail, even if the internal temperature of the battery returns to normal. unable to continue working

Method used

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

Examples

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preparation example Construction

[0044] Another embodiment of the present invention provides a method for preparing a battery pole piece, comprising the following steps:

[0045] 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 thermal expansion coating; wherein, the thermal expansion coating contains a thermoplastic polymer, and the thermal expansion coefficient of the thermoplastic polymer is 5.5×10 -5 / K~20×10-5 / K.

[0046] In one embodiment, the raw materials of the coating forming the thermal expansion coating include thermoplastic polymer, solvent and binder, and the mass ratio of thermoplastic polymer, solvent and binder is (6.5~8.9):(5.8~7.7) : (0.5~1.3).

[0047] Specifically, transfer coating or extrusion coating can be used to uniformly coat the active material slurry on th...

Embodiment 1

[0066] 1. Preparation of thermal expansion coating:

[0067] Add ethylene-ethyl acrylate, N-methylpyrrolidone and sodium alginate to the closed mixer successively according to the mass ratio of 7.8:6.1:0.5. 15r / min, rotate at 100r / min and stir for 150min, then add heat-expandable polymer into the mixer and heat to 140-150°C, continue stirring at the same speed for 180min to obtain evenly dispersed molten heat-expandable coating, put the coating in the transfer tank , keep warm and stir at a low speed of 10r / min.

[0068] 2. Preparation of positive pole piece and negative pole piece

[0069] The positive active material slurry is evenly coated on the middle position of the opposite surfaces of the aluminum foil by extrusion coating method, and the above-mentioned thermal expansion coating is evenly coated around the active material coating on the aluminum foil, and dried to obtain the following: figure 1 Positive pole piece shown with intumescent coating and positive active m...

Embodiment 2

[0074] Example 2 is basically the same as Example 1, except that the mass ratio of ethylene-ethyl acrylate, N-methylpyrrolidone and sodium alginate in the thermal expansion coating of Example 2 is 6.5:7.7:0.5.

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Abstract

The invention relates to a battery pole piece, a preparation method thereof, a battery cell and a battery. The battery pole piece comprises a current collector, and an active material coating and a thermal expansion coating which are arranged on the same surface of the current collector. The thermal expansion coating is arranged around the active material coating. The thermal expansion coating contains a thermoplastic polymer, and the thermal expansion coefficient of the thermoplastic polymer is 5.5 * 10<-5> / K to 20 * 10<-5> / K. According to the invention, the thermal expansion coating is arranged around the active material coating, so that the overcharge and short circuit prevention performance of the battery can be improved, the electrochemical performance of the battery is not influenced, and the battery pole piece can be used for a second time.

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 source 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, but the safety performance has not been upgraded simultaneously. During the process of charging and short-circuiting, a large amount of heat will be generated sharply inside the battery and cannot be released, which will cause the battery to catch fire or even explode, seriously affecting the life and property safety of users. For power batteries wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/0585H01M10/0587H01M10/0525
CPCH01M4/13H01M4/139H01M4/0404H01M10/0585H01M10/0587H01M10/0525Y02E60/10Y02P70/50
Inventor 李景夫易四勇林琳林洋任超
Owner SOUNDON NEW ENERGY TECH CO LTD
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