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Lithium ion battery, preparation method thereof and application of porous aluminum-carbon composite material

A lithium-ion battery and carbon composite material technology, which is applied in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of difficult silicon carbon anode, high price, and difficulty in obtaining energy density lithium-ion batteries.

Inactive Publication Date: 2019-05-03
SOUNDON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult for silicon carbon anodes to be commercially applied. The main problems are low first efficiency, immature lithium supplementation technology, and huge volume expansion during the cycle, which lead to rapid attenuation of the cycle of the battery cell, and the cost of manufacturing nano-silicon process equipment. Higher, making its price much higher than that of graphite negative electrodes
Therefore, it is still very difficult to obtain lithium-ion batteries with high energy density

Method used

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  • Lithium ion battery, preparation method thereof and application of porous aluminum-carbon composite material
  • Lithium ion battery, preparation method thereof and application of porous aluminum-carbon composite material

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preparation example Construction

[0021] A method for preparing a lithium-ion battery according to an embodiment of the present invention includes the following steps S1-S3:

[0022] S1. Provide positive electrode, separator and electrolyte.

[0023] S2. Implanting the porous aluminum foil with carbon ions to obtain a negative electrode.

[0024] S3, assembling and processing the positive electrode, the separator, the negative electrode and the electrolyte to obtain the lithium ion battery.

[0025] Compared with graphite materials, metal aluminum (Al) has a higher theoretical specific capacity. When the LiAl structure is formed, the specific capacity can reach 993mAh / g. When the LiAl structure is formed, the specific capacity can reach 993mAh / g. 9 Al 4 materials, the specific capacity reaches 2235mAh / g, and the voltage platform is only 0.19V~0.45V (vs Li + / Li), and it has a smaller volume expansion than silicon materials, forming Li 9 A l4 , the volume expansion is only 97%, and the Al material also has...

Embodiment 1

[0036] The porous aluminum foil with a porosity of 10% and a thickness of 16 μm was ultrasonically cleaned in ethanol, acetone and deionized water to remove surface dirt, and then placed in a vacuum drying oven at 80°C for 20 minutes to dry. Take out the dried porous aluminum foil, place it in the ion implantation equipment, start vacuuming after sealing, and the vacuum degree reaches 1 × 10 -6 At torr, the energy density is 6μA / cm 2 Clean the surface of the porous aluminum foil for 20 minutes with a flow of argon ions. Then carbon ion implantation is carried out, and carbon ions are implanted into one side of the porous aluminum foil. After the single-sided ion implantation is completed, the above-mentioned ion implantation operation is repeated, and carbon ions are implanted into the other side of the aluminum foil to obtain a porous aluminum foil / carbon composite negative electrode. The carbon ion implantation energy is 1KeV, and the ion implantation dose is 1×10 -5 g / cm ...

Embodiment 2

[0040] The porous aluminum foil with a porosity of 20% and a thickness of 24 μm was ultrasonically cleaned in ethanol, acetone and deionized water to remove surface dirt, and then placed in a vacuum drying oven at 90°C for 10 minutes to dry. Take out the dried porous aluminum foil, place it in the ion implantation equipment, and start vacuuming after sealing, and the vacuum degree reaches 0.5×10 -6 At torr, the energy density is 7.5μA / cm 2 The surface of the porous aluminum foil was cleaned by the argon ion flow for 10 minutes. Then carbon ion implantation is carried out, and carbon ions are implanted into one side of the porous aluminum foil. After the single-sided ion implantation is completed, the above-mentioned ion implantation operation is repeated, and carbon ions are implanted into the other side of the aluminum foil to obtain a porous aluminum foil / carbon composite negative electrode. The carbon ion implantation energy is 1.5KeV, and the ion implantation dose is 1×10...

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Abstract

The invention relates to a lithium ion battery, a preparation method thereof and the application of a porous aluminum-carbon composite material. The preparation method of the lithium ion battery comprises the following steps: providing a positive electrode, a diaphragm and an electrolyte; carrying out carbon ion implantation on a porous aluminum foil to obtain a negative electrode; assembling andprocessing the positive electrode, the diaphragm, the negative electrode and the electrolyte to obtain the lithium ion battery. The inventor of the invention creatively adopts a specific porous aluminum-carbon composite material. Namely, a porous aluminum foil injected with carbon ions is used as a negative electrode. The porous aluminum foil can serve as an active negative electrode material anda current collector at the same time. The problems of volume expansion, poor conductivity after lithium intercalation and the like in the metal aluminum negative electrode circulation process can be effectively solved. The circulation performance and the rate capability are improved. Meanwhile, the porous aluminum foil can effectively improve the energy density of a battery when serving as a negative electrode due to higher gram volume, lighter mass and thinner thickness.

Description

technical field [0001] The invention relates to the technical field of energy materials, in particular to a lithium-ion battery, a preparation method thereof, and an application of a porous aluminum-carbon composite material. Background technique [0002] At this stage, high energy density is the main development direction of lithium-ion batteries, and the improvement of energy density mainly includes two ways: first, under the existing material system, increase the compaction density of positive and negative electrode materials, use less electrolytic Liquid and use thinner auxiliary materials to increase the volumetric energy density and mass energy density, however, excessive compaction density will affect the performance of the material, reducing the use of electrolyte will lead to a decrease in cycle performance, and the use of thinner auxiliary materials not only increases This will increase the difficulty of the manufacturing process and increase safety risks; secondly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/46H01M4/62H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 肖君林石谦陈小平
Owner SOUNDON NEW ENERGY TECH CO LTD
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