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All-solid-state lithium ion battery and fabrication method thereof

A lithium-ion battery, all-solid-state technology, applied in electrolyte battery manufacturing, electrode manufacturing, secondary battery and other directions, can solve the problems of fast battery decay, increase interface impedance, high interface impedance, and achieve the effect of convenient assembly and reduced manufacturing cost.

Active Publication Date: 2016-11-23
MICROVAST POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the thin-film all-solid-state lithium-ion battery has a high volume-to-energy ratio, it is not suitable for mass production due to its high manufacturing cost and small single-cell capacity.
The production process of the traditional powder method all-solid-state lithium-ion battery is similar to the production process of the mature electrolyte lithium-ion battery. It is mainly formed by coating the positive electrode active material on the positive electrode current collector and drying it, but the gap between the solid powder and the solid powder The interfacial impedance is too high, resulting in fast battery attenuation, which has been the main reason why this method has not been applied on a large scale; in addition, in the production and preparation of the positive and negative electrodes of the traditional powder-based all-solid-state lithium-ion battery, due to the adhesive and conductive The use of the agent reduces the specific gravity of the active material in the positive and negative electrode materials and leads to the thickening of the active material layer, which further increases the interface impedance problem

Method used

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Examples

Experimental program
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Embodiment 1

[0039] figure 1 Among them, the positive electrode current collector 1 includes a metal foil and a positive electrode three-dimensional three-dimensional porous structure layer 2 obtained by surface modification of the metal foil. The positive electrode current collector 1 and the positive electrode three-dimensional porous structure layer 2 generally use the same metal material. The porous layer is located on the two surfaces of the positive electrode current collector, and the two are bonded by metal bonds to ensure the bonding strength and electronic conductivity. Eliminate the use of conductive agents. The positive electrode active material layer 3 enters the positive electrode three-dimensional porous structure layer 2 in an embedded manner. This three-dimensional structure enables the active material and the current collector to contact in a larger-than-surface manner to enhance the conductivity of the electrode and at the same time act as a fastening activity. The role...

Embodiment 2

[0041] The positive current collector is a non-porous 10-micron copper foil. The positive electrode material is LCO micron-sized powder with an average particle size of 2 microns. The positive electrode slurry is composed of 96% positive electrode active material, 2% VGCF conductive agent, 2% PAI (NMP is solvent) binder, and the solid content ratio is 55% when mixing. After that, the slurry was coated on the copper foil with a coater, and the thickness was controlled to be 40 microns. After drying at 180C, rolling was performed, and the final compacted thickness of the positive active material layer was 20 microns. The solid electrolyte LiPON was deposited on the smooth cathode surface by vacuum electron beam evaporation with a thickness of 2 μm. The thickness of the connecting layer lithium metal is 100 nanometers, which is deposited on the surface of the solid electrolyte by vacuum hot-dip method. The negative electrode current collector is a 10-micron non-porous copper f...

Embodiment 3

[0043] The same as Example 2, the difference is that the positive electrode current collector has a three-dimensional porous structure as a whole, and the positive electrode active material is coated with the current collector from the front and back surfaces in a three-dimensional embedding manner; the thickness of the positive electrode current collector is 20 microns; The thickness of the active material layer is 20 microns; the negative active material layer is 10 microns metal lithium; the thickness of the solid electrolyte is less than 2 microns; the thickness of the metal lithium connection layer is 1 micron; the surface roughness of the polished positive active material is less than 2 microns; the negative electrode lithium and lithium connection layer Butt, vacuum-packed with packaging aluminum-plastic film, and apply a small amount of pressure under the heating condition of 130C.

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Abstract

The invention relates to a lithium ion battery and a fabrication method thereof, in particular to an all-solid-state lithium ion battery and a fabrication method thereof. The all-solid-state lithium ion battery comprises a positive current collector, a positive active material layer, a negative current collector, a negative active material layer and a solid electrolyte, wherein the positive active material layer is fabricated on the positive current collector by a powder method, and the negative active material layer is fabricated on the negative current collector by a thin film method. By the fabrication method, the all-solid-state lithium ion battery which has excellent integral performance, is low in production cost and is suitable for large-scale industrial production can be obtained.

Description

technical field [0001] The invention relates to a lithium ion battery and a preparation method thereof, in particular to an all-solid-state lithium ion battery and a preparation method thereof. Background technique [0002] In recent years, with the development of electric vehicles, grid energy storage and other needs, it is very necessary to develop a battery with wide temperature range, high safety and high energy density. Currently, among various commercialized rechargeable and dischargeable chemical energy storage devices, lithium-ion batteries have the highest energy density. However, the existing commercial lithium-ion batteries are mainly lithium-ion batteries with liquid electrolytes or gel electrolytes. The existence of electrolytes affects the performance of lithium-ion batteries. For example, the electrochemical performance of organic electrolyte systems commonly used in such batteries The window is generally less than 4.5V, which limits the use of high-voltage c...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/058H01M4/04H01M4/139
CPCH01M4/0404H01M4/139H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 汤静邓国友王卫涛
Owner MICROVAST POWER SYST CO LTD
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