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A kind of aluminum-containing negative electrode material, negative electrode pole piece 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 simple equipment

Active Publication Date: 2022-03-04
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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  • A kind of aluminum-containing negative electrode material, negative electrode pole piece and lithium ion secondary battery
  • A kind of aluminum-containing negative electrode material, negative electrode pole piece and lithium ion secondary battery
  • A kind of aluminum-containing negative electrode material, negative electrode pole piece 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 adopt various methods known to those skilled in the art, for example, may include the following steps:

[0034] (1) Prepare the positive electrode sheet: apply the positive electrode slurry on the aluminum foil positive electrode current collector to prepare the positive electrode sheet;

[0035] (2) Preparation of negative electrode sheet: Weigh the amount of each component, first make the binder PVDF or / PVDF and NMP into glue according to the preset ratio (if PVDF and NMP are used at the same time, the ratio of the two can be determined by the expert in the field set by the technician), then add the modifier and stir evenly, then add aluminum powder and stir and disperse to obtain modified aluminum powder, then add conductive agent for stirring and dispersing, so that the aluminum powder is evenly dispersed in the conductive agent, and finally add graphite negative electrode active material Stir and disperse to form a...

Embodiment 1

[0039] Example 1: Lithium-ion secondary battery containing aluminum-containing negative electrode pole piece made from the aluminum-containing negative electrode material of the present invention

[0040] The positive electrode material is nickel-cobalt lithium manganate (NCM), and the negative electrode is a new negative electrode material. The aluminum powder in the new negative electrode material is D50 6.0 μm, the graphite is D50 15 μm artificial graphite, and the current collector is 8 μm copper foil. Coating nickel cobalt lithium manganate (NCM) positive electrode material with a specific capacity of 160mAh / g, PVDF, and conductive carbon black on double-sided aluminum foil at a ratio of 96.5:1.5:2 as the positive electrode sheet; the full battery design specific capacity is 340mAh / g g of artificial graphite negative electrode material and aluminum powder with a design specific capacity of 750mAh / g of the full battery, modifier polyacrylonitrile (PAN), conductive carbon bl...

Embodiment 2-6

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

[0051] The difference between Examples 2-6 and Example 1 is the content ratio of modifier polyacrylonitrile (PAN) in the negative pole piece, while the preparation steps of the positive pole, negative pole piece, electrolyte and battery are the same, and the polypropylene in the negative pole piece is Nitrile (PAN) content ranges from 0.5% to 3%. The battery of Example 2-10 was charged and discharged at 0.5C, and the charge and discharge test was carried out under the condition of a voltage range of 2.5~4.2V, and compared with Example 1, the test results are as follows in Table 2:

[0052] Table 2. Battery test data of Examples 1-6 of the present invention

[0053]

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Abstract

The invention discloses an aluminum-containing negative electrode material, a negative electrode pole piece and a lithium ion secondary battery, and relates to the technical field of lithium ion batteries. The aluminum-containing negative electrode material, in terms of mass fraction, includes 1-40% of aluminum powder negative electrode active material, 55-95% of graphite negative electrode active material, 0.5-3% of modifier, and 1-4% of binder; The active agent is selected from polymers with binding properties containing one or more of imide rings, amide groups, amine groups, cyano groups, ester groups and tetrafluoro substituents in the main chain. The present invention utilizes modifiers and aluminum powder to form hydrogen bonds, chemical bonds, etc., to modify the surface of aluminum powder, improve the adhesion between aluminum powder and other materials, and solve the problem of aluminum powder or aluminum powder / graphite composite material cycle stability The problem of poor performance; furthermore, the obtained aluminum-containing negative electrode sheet has good adhesion and flexibility, and the lithium-ion secondary battery prepared by using the aluminum-containing negative electrode sheet has high energy density, high safety, and good cycle stability.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an aluminum-containing negative electrode material, a negative electrode sheet and a lithium ion secondary battery. Background technique [0002] Lithium-ion batteries are widely used in the fields of automobiles and electronics. At present, lithium-ion batteries on the market mainly use graphite as the negative electrode active material. The theoretical lithium-intercalation specific capacity of graphite is 372mAh / g, and the lithium-intercalation potential is about 0.1V. In order to improve the energy density of lithium-ion batteries, negative electrode materials must be developed in the direction of high specific capacity. Metal aluminum reacts with lithium ions to form a Li-Al alloy. The theoretical lithium intercalation specific capacity of aluminum is 993mAh / g, and the lithium intercalation potential is about 0.25V. The theoretical lithium intercalation specifi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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