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Aluminum-containing negative electrode material, negative electrode plate and lithium ion secondary battery

A technology of negative electrode material and negative electrode sheet, which is applied in the direction of secondary battery, secondary battery repair/maintenance, battery electrode, etc., can solve the problems of poor battery cycle performance and low battery energy density, and achieve high energy density and good cycle The effect of stability and high security

Active Publication Date: 2021-03-26
REAL POWER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the battery cycle performance of the metal-containing negative electrode is poor, and the battery energy density is low

Method used

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  • Aluminum-containing negative electrode material, negative electrode plate and lithium ion secondary battery
  • Aluminum-containing negative electrode material, negative electrode plate and lithium ion secondary battery
  • Aluminum-containing negative electrode material, negative electrode plate and lithium ion secondary battery

Examples

Experimental program
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Effect test

preparation example Construction

[0033]The preparation method of the secondary battery can employ various methods well known to those skilled in the art, for example, may include the following steps:

[0034] (1) Preparation of a positive electrode: Positive pole slurry is applied to the preparation of a positive electrode sheet in the positive electrode current collector of the aluminum foil;

[0035] (2) Preparation of negative electrode sheet: It is called the amount of different components, first of all, the binder PVDF and / or NMP is first formed into colloquilis (such as using PVDF and NMP, the proportion of the two can be used by the art. The person is set), then the modifier is mixed, then the aluminum powder is stirred and dispersed to obtain a modified aluminum powder, and then the conductive agent is added to stir dispersion, so that the aluminum powder is uniformly dispersed in the conductive agent, and finally add graphite negative electrode active materials. The stirring dispersion forms a uniform ...

Embodiment 1

[0039] Example 1: Lithium ion secondary battery of an aluminum-containing negative electrode sheet obtained by an aluminum-containing negative electrode material of the present invention

[0040] The positive electrode material uses lithium nickel-watery (NCM), and the negative electrode uses a new type of negative electrode material, wherein the aluminum powder in the novel negative electrode material is D50 6.0 um, the graphite is a human graphite of D50 15 um, and the current collector is an 8 um copper foil. Lithium nickel-channlate (NCM) positive electrode material with a capacity of 160 mAh / g, a PVDF, conductive carbon black, is applied to the double-sided aluminum foil as a positive electrode sheet; 340 mAh is 340 mAh G's artificial graphite negative electrode material and a total battery design of 750 mAh / g of aluminum powder, modifier polyacrylonitrile (PAN), conductive carbon black SP, binder PVDF Press 64: 30: 1: 2: 3 ratio And then the binder PVDF is first formed i...

Embodiment 2-6

[0050] Example 2-6: Effect of different content ratios of modifier polyclinne (PAN) on battery performance

[0051] Example 2-6 Different in the first embodiment, the proportion of modified polyacrylonitrile (PAN) content in the negative electrode sheet, and the positive electrode, the negative electrode sheet, the electrolyte and the battery preparation step are the same, and polypropylene in the negative electrode plate The content ratio of nitrile (PAN) is 0.5% to 3%. The charging and discharge rate of the battery of Example 2-10 at 0.5 C is performed under the voltage range of 2.5 to 4.2 V, and the charge and discharge test is performed, and the test results are as follows: Table 2 below.

[0052] Table 2. Example 1-6 Battery Test Data

[0053]

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Abstract

The invention discloses an aluminum-containing negative electrode material, a negative electrode plate and a lithium ion secondary battery, and relates to the technical field of lithium ion batteries.The aluminum-containing negative electrode material comprises the following components in percentage by mass: 1-40% of an aluminum powder negative electrode active material, 55-95% of a graphite negative electrode active material, 0.5-3% of a modifier and 1-4% of a binder, wherein the modifier is a polymer with bonding performance, and the main chain of the polymer contains one or more of an imide ring, an amide group, an amino group, a cyano group, an ester group and a tetrafluoro substituent group. The modifier and the aluminum powder form hydrogen bonds, chemical bonds and the like to perform surface modification on the aluminum powder so as to enhance the binding property between the aluminum powder and other materials and solve the problem of poor cycle stability of the aluminum powder or aluminum powder / graphite composite material. Therefore, the prepared aluminum-containing negative electrode plate has good cohesiveness and flexibility, and the lithium ion secondary battery prepared from the aluminum-containing negative electrode plate has high energy density, high safety and good cycling stability.

Description

Technical field [0001] The present invention relates to the field of lithium ion batteries, and more particularly to an aluminum-containing negative electrode material, a negative electrode plate, and a lithium ion secondary battery. Background technique [0002] Lithium-ion batteries are widely used in automobiles, electronic fields. At present, the lithium-ion battery on the market mainly uses graphite as an negative electrode active material. The atrial lithium-specific capacity of graphite is 372 mAh / g, and the lithium potential is about 0.1V. In order to improve the energy density of the lithium ion battery, the negative electrode material must develop in a high-specific capacity direction. The reaction of metal aluminum and lithium ion forms Li-Al alloy, the theoretical lithium-specific capacity of aluminum is 993 mAh / g, the lithium-lithium potential is about 0.25V, and the theoretical lithium aluminum is higher than graphite, and the lithium potential is slightly highe...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M4/38H01M10/0525H01M10/42
CPCH01M4/62H01M4/622H01M4/623H01M4/38H01M4/134H01M4/1395H01M10/0525H01M10/4235Y02E60/10
Inventor 唐永炳陈闪闪谢呈德蒋春磊徐建龙
Owner REAL POWER IND LTD
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