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Aluminum negative electrode material, preparation method and secondary battery

A negative electrode material and negative electrode technology, applied in the field of energy storage devices, can solve the problems of consumption of lithium metal and electrolyte, instability of SEI film, increase of interface impedance, etc., achieve good energy density, avoid direct contact, and reduce consumption

Active Publication Date: 2020-06-23
SHENZHEN INST OF ADVANCED TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems when aluminum foil is used as the negative pole piece: (1) The volume expansion and contraction are serious during the alloying process of lithium ions and aluminum metal, which is easy to cause electrode pulverization and lead to battery capacity attenuation; (2) metal aluminum and electrolyte occur at the interface The SEI film formed by the reaction continues to thicken with time, and the interfacial impedance continues to increase, resulting in a decrease in Coulombic efficiency and battery capacity attenuation; (3) Due to the continuous change in the volume of the aluminum metal negative electrode during charge and discharge, the SEI film is unstable. During the process, the continuous generation-breakage-regeneration consumes metal lithium and electrolyte

Method used

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  • Aluminum negative electrode material, preparation method and secondary battery
  • Aluminum negative electrode material, preparation method and secondary battery
  • Aluminum negative electrode material, preparation method and secondary battery

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preparation example Construction

[0080] In a second aspect, in at least one embodiment, a method for preparing an aluminum negative electrode material is provided, comprising the following steps: coating a slurry composed of a lithium material, a binder, and an optional conductive agent on the surface of an aluminum negative electrode substrate , and dried to obtain an aluminum negative electrode material with a pre-lithiated coating formed on the surface.

[0081] In a preferred embodiment, the preparation method of lithium-donating substance comprises the following steps:

[0082] In a protective atmosphere, lithium metal is mixed with a good conductor of lithium ions to prepare lithium metal coated with a good conductor of lithium ions;

[0083] Due to the active chemical properties of lithium metal, it is easily oxidized in the air. Therefore, in the process of coating the surface of lithium metal, it needs to be carried out in an environment with protective gas, for example, it can be carried out in a g...

Embodiment 1

[0098] An aluminum negative electrode material, comprising: a flat aluminum negative electrode substrate and a pre-lithiation coating with a thickness of 5 μm formed on the surface of the flat aluminum negative electrode substrate;

[0099] Wherein, the components forming the pre-lithiation coating include lithium metal coated with graphite oxide, polyvinylidene fluoride and conductive carbon black, and the mass ratio of the three is 5:3:2; the coating thickness of the lithium metal is 10 nm, and the particle size of lithium metal is 3 μm.

[0100] The specific preparation method includes the following steps:

[0101] Add 1 g of graphite into concentrated sulfuric acid (98% concentration) and stir to make it evenly mixed, then slowly add 0.4 g of potassium permanganate, continue to stir (speed 300 r / min), the reaction is completed after 6 hours, and centrifugation is used to obtain a solid substance, which is used Wash with ethanol for 3-5 times, put it in an oven to dry for ...

Embodiment 2

[0105] An aluminum negative electrode material, comprising: a porous aluminum negative electrode substrate and a pre-lithiation coating with a thickness of 10 μm formed on the surface of the porous aluminum negative electrode substrate;

[0106] Wherein, the components forming the pre-lithiation coating include lithium metal coated with lithium titanate, polyvinylidene fluoride and carbon nanotubes, and the mass ratio of the three is 6:3:1; the coating thickness of lithium metal is 100 nm, and the particle size of lithium metal is 5 μm.

[0107] The specific preparation method includes the following steps:

[0108] Under a helium atmosphere, 0.5g lithium metal and 1g lithium titanate were added to oleic acid, heated to 200°C, stirred at a speed of 300r / min for 3h, cooled to room temperature after the reaction was completed, the dispersion was filtered, washed, After drying, lithium metal coated with lithium titanate is obtained, which is transferred to a storage bottle and se...

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Abstract

The invention belongs to the technical field of energy storage devices, and relates to an aluminum negative electrode material, a preparation method and a secondary battery. The aluminum negative electrode material provided by the invention comprises an aluminum negative electrode matrix and a pre-lithiated coating formed on the surface of the aluminum negative electrode matrix, wherein slurry forforming the pre-lithiated coating comprises the following components: a lithium supply substance, a binder and an optional conductive agent. The preparation method of the aluminum negative electrodematerial comprises the steps of coating the surface of the aluminum negative electrode matrix with the slurry consisting of the lithium supply substance, the binder and the optional conductive agent,and drying to obtain the aluminum negative electrode material with a pre-lithiated coating formed on the surface. According to the aluminum negative electrode material provided by the invention, the pre-lithiated coating is formed on the surface of the aluminum negative electrode substrate, so that lithium required for forming an SEI film can be effectively provided, the consumption of Li<+> in anelectrolyte can be greatly reduced, and the initial Coulombic efficiency of the battery is high after the material is used for assembling the secondary battery. The preparation method provided by theinvention is simple in process, low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of energy storage devices, and in particular relates to an aluminum negative electrode material, a preparation method and a secondary battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, no memory effect, long cycle life, and fast discharge. They have huge market demand in electric vehicles, consumer electronics, energy storage power supplies, aerospace and other fields. The performance of ion batteries puts forward higher requirements. [0003] The commercialized negative electrode material graphite has a low theoretical capacity of only 372mAh / g; the commercialized silicon negative electrode material has high capacity but poor conductivity, so the integration of negative electrode material and current collector cannot be realized; Although the lithium metal negative electrode has high capacity and good conductivity, it is easy to grow lithium dendrites o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/66H01M4/46H01M4/40H01M4/62H01M10/0525
CPCH01M4/366H01M4/405H01M4/463H01M4/621H01M4/661H01M4/667H01M10/0525Y02E60/10
Inventor 唐永炳王海涛谢呈德
Owner SHENZHEN INST OF ADVANCED TECH