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Metallic film capable of improving stability of anode of lithium ion battery and manufacturing method

A lithium ion battery and a manufacturing method technology, which are applied in the field of surface coating treatment, can solve problems such as expensive equipment, and achieve the effects of suppressing reaction, improving power characteristics and safety, and having good application prospects.

Inactive Publication Date: 2010-04-07
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the coating methods for thin-film electrodes include magnetron sputtering, plasma chemical vapor deposition, pulsed laser deposition, etc., and the required equipment is relatively expensive.

Method used

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  • Metallic film capable of improving stability of anode of lithium ion battery and manufacturing method
  • Metallic film capable of improving stability of anode of lithium ion battery and manufacturing method
  • Metallic film capable of improving stability of anode of lithium ion battery and manufacturing method

Examples

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Effect test

Embodiment 1

[0020] Dissolve polyvinylidene fluoride in an appropriate amount of N-methylpyrrolidone to make glue, lithium manganate and superconducting carbon black in proportion (lithium iron phosphate: superconducting carbon black: polyvinylidene fluoride=88:4 : 8wt%) was added into the glue and stirred evenly, and then coated on both sides of the aluminum foil with a film thickness of about 100um. After vacuum drying at 80°C for 12h, it was cut into pole pieces of 40×50mm. Put the cut positive electrode sheet into the sample chamber of the vacuum evaporation machine, and put the Al target into the evaporation chamber. Pump the vacuum degree of the vacuum evaporation machine to 2.0×10 -3 pa, set the evaporation distance to 15cm, the evaporation current to 380A, and the voltage to 5V, and start to coat the positive electrode. After 5 minutes of evaporation, slowly cool and take out the electrode to obtain a positive electrode with an Al-coated layer of 50nm. See figure 1 . The positive...

Embodiment 2

[0023]The positive electrode sheet made of lithium iron phosphate as the active material is coated with an Ag film with a thickness of 10nm on the surface by vacuum evaporation technology. After the positive electrode sheet is rolled, it is paired with the mesophase carbon microsphere negative electrode sheet and wound into a battery core. The battery cells are packed into shells, bottomed, roller grooved, liquid injected and sealed to obtain cylindrical lithium-ion batteries. After the battery is formed and divided, the performance test is carried out.

Embodiment 3

[0025] Using a mixture of nickel-cobalt lithium manganese oxide and lithium cobalt oxide as the active material, the positive plate is coated with a 50nm-thick Au coating on its surface and then a 50nm-thick Pd coating. After the positive electrode sheet is rolled, it is paired with the lithium titanate negative electrode sheet and wound into a cell. The battery cells are packed into shells, bottomed, roller grooved, liquid injected and sealed to obtain cylindrical lithium-ion batteries. After the battery is formed and divided, the performance test is carried out.

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Abstract

The invention relates to metallic film capable of improving the stability of the anode of a lithium ion battery and a manufacturing method. The metallic film is characterized in that: the metals of the metallic film are nanoscale metals which are stable at the working potential of the anode of the lithium ion battery and may be one or two of Al, Ag, Au, Pt and Pd; and the thickness of the metallic film is between 10 and 500 nanometers. Meanwhile, the metallic film is a layer of nanoscale metallic film coated on the surface of the anode plate of the lithium ion battery by a vacuum evaporation method. The coated film layer obtained is compact, uniform and controllable in thickness and has a high bonding force with the anode plate. The metallic coated film layer can protect the anode plate, inhibit the reaction of an anode with electrolyte in processes of battery charge and discharge and storage, improve the heat conductivity of the anode plate and the uniformity of the distribution of current density on the surface of the anode plate, thereby effectively prolonging the service life of the battery and improving power property and safety.

Description

technical field [0001] The invention relates to a metal film for improving the stability of the positive electrode of a lithium ion battery and a manufacturing method, in particular to a method for treating the surface coating of the positive electrode sheet of the lithium ion battery. The invention belongs to the field of positive electrode modification of modified lithium ion batteries. Background technique [0002] Lithium-ion batteries are high-performance, green and environmentally friendly secondary batteries that have been widely used in mobile electronic equipment terminals such as mobile phones, portable computers, video cameras, and cameras. With the development of lithium-ion battery technology, its application scope is gradually expanding to the fields of electric tools, electric vehicles and energy storage batteries. However, there are still some problems to be solved before lithium-ion batteries enter the above-mentioned market on a large scale, mainly because...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04
CPCY02E60/12Y02E60/10
Inventor 张建张熙贵谢晓华娄豫皖夏保佳
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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