Composite cathode pole piece of lithium ion battery and lithium ion battery thereof

A technology for lithium-ion batteries and negative pole pieces, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing battery capacity, reducing rate performance, and loss of lithium in positive pole piece materials, so as to improve the transmission rate and avoid Mutual interference, improve the effect of high temperature shelving

Inactive Publication Date: 2017-07-28
JIANGSU LENENG BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the first charging process of a lithium-ion battery, due to the formation of a solid electrolyte film (SEI film) on the surface of the negative electrode, part of the lithium migrated from the positive electrode is consumed, resulting in the loss of lithium in the positive electrode material, which not only reduces the battery capacity, but also It will cause the reduction of the battery's initial efficiency and its safety performance; at the same time, the reduction of the number of lithium ions will reduce the number of lithium ions transmitted during the fast charge and fast discharge of the lithium ion battery, thereby reducing its rate performance
In order to solve this problem, the positive electrode sheet can be improved from the following two aspects, and the negative electrode sheet can be coated to provide lithium ions for the negative electrode sheet to form SEI during charge and discharge, and improve its cycle and rate performance, such as Patent (CN 106099041 A) A lithium titanate composite negative pole piece and a lithium titanate battery, which improve the safety of lithium-ion batteries by coating the surface of the negative pole piece with a functional layer, an active material layer and a lithium metaaluminate composite layer However, although the lithium ions contained in the metaaluminate layer can increase the transmission rate of lithium ions, its composition has no effect on the improvement of the SEI film, and it will cause the surface of the pole piece to be in contact with the SEI during the charge and discharge process. Potential difference and interfacial resistance are formed between them, resulting in deviation of cycle performance

Method used

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  • Composite cathode pole piece of lithium ion battery and lithium ion battery thereof
  • Composite cathode pole piece of lithium ion battery and lithium ion battery thereof
  • Composite cathode pole piece of lithium ion battery and lithium ion battery thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation method of composite negative electrode sheet:

[0021] 1. Configuration of spraying liquid: Weigh 70g of polyvinylidene fluoride, 15g of carboxymethyl cellulose, and 15g of LA133 binder, add them to 500ml of N-methylpyrrolidone and disperse evenly to obtain a composite binder; weigh the above 30% weight of composite binder, and add 70g of lithium acetate, and disperse uniformly through a high-speed disperser to obtain an organic lithium spraying liquid; simultaneously weigh the above-mentioned 30% by weight of composite binder, and add 70g of lithium nitride, and disperse through a high-speed machine to disperse evenly to obtain inorganic lithium spraying liquid;

[0022] 2. Production of composite pole piece: Weigh 90g artificial graphite, 5gsp conductive agent and 5gLA133 binder, add it to 200g deionized water and disperse evenly to prepare negative electrode slurry, and prepare negative pole piece by coating. Spray the organic lithium spraying liquid on ...

Embodiment 2

[0024] 1. Configuration of spraying liquid: Weigh 60g of polyvinylidene fluoride, 20g of carboxymethyl cellulose, and 20g of LA133 binder, add them to 500ml of N-N-dimethylformamide and disperse evenly to obtain a composite binder; after that Weigh the above-mentioned 20% weight composite binder, and add 70g ethoxylithium, and disperse evenly through a high-speed disperser to obtain an organic lithium spraying liquid; simultaneously weigh the above-mentioned 20% weight composite binder, and add 70g Lithium amide, and uniformly dispersed by a high-speed disperser to obtain an inorganic lithium spraying liquid;

[0025] 2. Preparation of the composite pole piece: the preparation of the negative pole piece is the same as in Example 1.

[0026] Spray the organic lithium spraying liquid on one side of the negative electrode sheet by spraying technology, and after drying, obtain the electrode sheet A (dry thickness is 1 μm), and then spray the inorganic lithium spraying liquid on th...

Embodiment 3

[0028] 1. Configuration of spraying liquid: weigh 80g of polyvinylidene fluoride, 10g of carboxymethyl cellulose, and 10g of LA133 binder, add them to 500ml of tetrahydrofuran and disperse evenly to obtain a composite binder; then weigh the above 40% by weight Composite binder, and add 80g of alkyl dilithium carbonate, and disperse uniformly through a high-speed disperser to obtain an organic lithium spraying liquid; simultaneously weigh the above-mentioned 40% by weight of the composite binder, and add 80g of lithium amide, and disperse through a high-speed dispersion machine to disperse evenly to obtain inorganic lithium spraying liquid;

[0029] 2. Preparation of the composite pole piece: The preparation of the negative pole piece is the same as that in Example 1.

[0030] Spray the organic lithium spraying liquid on one side of the negative electrode sheet by spraying technology, and after drying, obtain the electrode sheet A (dry thickness is 5 μm), and then spray the ino...

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PUM

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Abstract

The invention belongs to the field of lithium ion battery preparation, and particularly discloses a composite cathode pole piece of a lithium ion battery and the lithium ion battery thereof. The composite cathode pole piece is composed of a cathode pole piece, an organic lithium compound and inorganic lithium compound which are coated at both sides of the cathode pole piece. The inorganic lithium compound is a nitrogen-containing lithium compound, such as lithium nitride and lithium amide; the electronic conductivity and structural stability of the inorganic lithium compound are improved by using the nitrogen atom, and the lithium ion transmission rate during the charging and discharging processes is improved by using the lithium ion therein; the organic lithium compound, such as lithium acetate, lithium alkoxy, alkyl bislithium carbonate, can improve the compatibility between the material surface thereof and electrolyte, and the high-temperature stabilization performance; for the surface of the prepared composite cathode pole piece contains sufficient lithium ion, the cathode pole piece can avoid the formation of lithium dendrites of the lithium ion battery during the charging and discharging processes, and the improve the safety performance thereof; the prepared composite cathode pole piece is applied to the lithium ion battery, and the rate capability and safety performance of the lithium ion battery can be improved.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion batteries, in particular to a lithium ion battery composite negative pole piece and the lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles and other fields due to their high voltage, high energy density, long cycle life, and environmental friendliness. However, with the development of miniaturization and long standby time of portable electronic devices, and the use of high-power and high-energy devices such as electric vehicles and energy storage components, higher and higher requirements are placed on the performance of lithium-ion batteries, especially lithium-ion batteries. Ion batteries have higher energy density, safety performance and fast charge and fast discharge capabilities. [0003] During the first charging process of a lithium-ion battery, due to the formation of a solid electrolyte film (SEI film) on the surface of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/137H01M4/136H01M4/36H01M4/58H01M4/60H01M4/62H01M10/0525
CPCH01M4/136H01M4/137H01M4/366H01M4/58H01M4/60H01M4/623H01M10/0525Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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