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A kind of lithium ion battery thick electrode coating method

A lithium-ion battery and electrode technology, applied in battery electrodes, electrode current collector coatings, secondary batteries, etc., can solve the problem of inability to solve the difficulty of electrolyte penetration, inability to achieve complete infiltration of thick electrodes, and low coating production efficiency. problem, to reduce the risk of lithium precipitation, shorten the soaking time, and reduce the effect of electrochemical impedance

Active Publication Date: 2022-07-29
TIANJIN ENERGIES
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in these coating methods, the slurry is coated at normal temperature. For equipment with a limited length of pole piece drying oven, drying will be difficult, and even cracks in the positive electrode coating will occur. The high drying temperature of the pole piece will easily cause binder Floating, poor pole piece peeling force, and low coating production efficiency
Thick electrode coating adopts the method of continuous coating, and the electrode structure constructed is not conducive to the infiltration of thick electrodes, and cannot solve the problem of electrolyte penetration from the diaphragm to the coating layer and then to the current collector, and cannot achieve complete infiltration of thick electrodes. Thereby reducing the battery capacity, and even bring safety risks due to lithium precipitation at the negative electrode

Method used

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  • A kind of lithium ion battery thick electrode coating method
  • A kind of lithium ion battery thick electrode coating method
  • A kind of lithium ion battery thick electrode coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: The circulating water in the high-temperature circulating water interlayer 8 on the outer wall of the stirring tank 7 (the spacing of the interlayer is 4 mm, and the height is consistent with the stirring tank height) is automatically heated using a water heater, and the temperature of the circulating water is automatically controlled by the temperature control system (The temperature is 50°C), if the circulating water temperature is lower than the set temperature, the water heater will automatically heat up, and if the circulating water temperature is higher than the set temperature, the water heater will automatically power off, so as to obtain high-temperature pretreated slurry and reduce the coating temperature. Reduces energy consumption, improves production efficiency, reduces the requirement for the length of the coating machine oven, and reduces the risk of high temperature coating adhesive floating up, resulting in low pole piece peeling force, and ...

Embodiment 2

[0048] Embodiment 2: the circulating water in the high temperature circulating water interlayer 8 (the spacing of the interlayer is 4mm, the height is consistent with the stirring tank height) of the outer wall of the stirring tank 7 is automatically heated using a water heater, and the temperature of the circulating water is automatically controlled by the temperature control system (The temperature is 40°C), if the circulating water temperature is lower than the set temperature, the water heater will automatically heat up. If the circulating water temperature is higher than the set temperature, the water heater will automatically power off, so as to obtain high-temperature pretreated slurry and reduce the coating temperature. Reduces energy consumption, improves production efficiency, reduces the requirement for the length of the coating machine oven, and reduces the risk of high temperature coating adhesive floating up, resulting in low pole piece peeling force, and improves ...

Embodiment 3

[0052] Embodiment three: with the circulating water in the high temperature circulating water interlayer 8 (the interlayer spacing is 4mm, the height is consistent with the stirring tank height) of the outer wall of the stirring tank 7, use the water heater to automatically heat, and the temperature of the circulating water is automatically controlled by the temperature control system (The temperature is 40°C), if the circulating water temperature is lower than the set temperature, the water heater will automatically heat up. If the circulating water temperature is higher than the set temperature, the water heater will automatically power off, so as to obtain high-temperature pretreated slurry and reduce the coating temperature. Reduces energy consumption, improves production efficiency, reduces the requirement for the length of the coating machine oven, and reduces the risk of high temperature coating adhesive floating up, resulting in low pole piece peeling force, and improves...

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Abstract

The invention provides a method for coating a thick electrode of a lithium ion battery. The slurry is extruded from the slit of the lip of a coating machine to form a coated pole roll, and the coated pole roll is firstly cut at the bottom of the pole piece. , to obtain the length of the required pole piece; then cut along the direction perpendicular to the coating to obtain the width of the pole piece, and there is no blank interval in the longitudinal middle part of each pole piece. The distance of the channel interval is 2mm more than the width of the pole piece itself, which is used to construct the electrolyte permeation channel. The lithium ion battery thick electrode coating method of the present invention shortens the infiltration time of the electrolyte, thereby reducing the EIS electrochemical impedance, improving the capacity of the battery, and reducing the risk of lithium precipitation on the surface of the negative electrode during high-rate charge and discharge.

Description

technical field [0001] The invention belongs to the technical field of lithium ion power battery production, in particular to a method for coating thick electrodes of lithium ion batteries. Background technique [0002] With the gradual development of lithium-ion battery technology and the continuous advancement of the country's new energy industry, the automotive industry has repeatedly increased the requirements for high energy density and lightweight lithium-ion batteries in recent years. At present, the method to improve the energy density of the battery is to reduce the proportion of the electrode inactive material components from the design point of view to improve the energy storage of the active material in the electrode. Reducing the content of binder and conductive agent is a commonly used solution. Another method is to increase the ratio of the active material to the current collector (copper, aluminum foil), that is, to increase the coating amount of the electro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B05C9/14B05C11/10B05C11/11H01M4/04H01M4/139H01M10/0525
CPCB05C9/14B05C11/1042B05C11/10B05C11/11H01M4/139H01M4/0404H01M10/0525Y02E60/10
Inventor 陈素娜马华
Owner TIANJIN ENERGIES