Tab extraction method for all-solid-state thin film lithium ion battery with vertical structure

A lithium-ion battery, all-solid-state technology, applied in the direction of structural parts, battery pack parts, non-aqueous electrolyte storage batteries, etc., can solve the problems of low space utilization of the substrate, difficulty in leading out the negative electrode tab, short circuit, etc., and save the process , strong binding force and excellent electrical conductivity

Active Publication Date: 2017-03-22
THE NORTHERN RES INST OF NJUST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tab lead-out method of this structure is relatively simple and direct, but the space utilization rate of the substrate is low, which limits the capacity to a certain extent
The all-solid-state thin-film battery with a vertical structure maximizes the use of the substrate area, and has a simple structure that reduces the use of molds. However, with this structure, it is extremely difficult to lead out the negative electrode tab, especially in the case of high electrode material space utilization. Under the circumstances, it is very easy to have open circuit and short circuit phenomenon.

Method used

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  • Tab extraction method for all-solid-state thin film lithium ion battery with vertical structure
  • Tab extraction method for all-solid-state thin film lithium ion battery with vertical structure
  • Tab extraction method for all-solid-state thin film lithium ion battery with vertical structure

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Experimental program
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Effect test

Embodiment 1

[0028] figure 1 is a cross-sectional view of the all-solid-state thin-film battery of the present invention, such as figure 1 As shown, the method for leading out the tabs of the all-solid-state thin-film lithium-ion battery of the present invention includes a stainless steel foil substrate 1, a Ti adhesion layer 2, a Pt positive electrode current collector 3, and a LiMn 2 o 4 Positive electrode 4, LiPON electrolyte 5,, TiO 2 Negative electrode 6, Pt negative electrode current collector 2, negative electrode tab 8, PE insulating film material 7, silver paste 9.

[0029] Figure 2a to Figure 2i It is the flow chart of battery tab extraction in the present invention, as shown in the figure,

[0030] Figure 2a is a stainless steel foil substrate with a positive tab;

[0031] Figure 2b A Ti adhesion layer is plated on a stainless steel foil substrate using a magnetron sputtering DC power supply;

[0032] Figure 2c Pt positive current collector is plated on the adhesion...

Embodiment 2

[0040] In embodiment 2 and embodiment 1 Figure 2a to Figure 2g The process is exactly the same and will not be repeated here. The difference is that Figure 2h , 2i , Fix the stainless steel foil negative electrode tab with the positive electrode tab on the negative electrode current collector by using PE insulating film material and copper conductive glue.

[0041] Finally, the tab part of the negative electrode must be isolated from the positive electrode and its current collector through an insulating film. Among them, the cathode material LiMn 2 o 4 After the film is coated, it needs to be annealed in the air at 700°C for 30 minutes, and the thickness is about 1 μm. The performance of the all-solid-state thin film battery made by this method can reach 45 μAh cm -2 , which is basically consistent with the test results of other methods.

Embodiment 3

[0043] In embodiment 3 and embodiment 1 Figure 2a to Figure 2g The process is exactly the same and will not be repeated here. The difference is that Figure 2h , 2i , The stainless steel foil negative electrode tab with positive electrode tab is fixed on the negative electrode current collector by using PE insulating film material and micro-welding technology.

[0044] Finally, the tab part of the negative electrode must be isolated from the positive electrode and its current collector through an insulating film. Among them, the cathode material LiMn 2 o 4 After the film is coated, it needs to be annealed in the air at 700°C for 30 minutes, and the thickness is about 1 μm. The performance of the all-solid-state thin film battery made by this method can reach 45 μAh cm -2 , which is basically consistent with the test results of other methods.

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Abstract

The invention discloses a tab extraction method for an all-solid-state thin film lithium ion battery with a vertical structure. The tab extraction method comprises the steps of plating a substrate with a positive electrode tab with an adhesion layer, a positive electrode current collector, a positive electrode film, an electrolyte film, a negative electrode film and a negative electrode current collector through magnetron sputtering in sequence; and enabling a negative electrode tab with the positive electrode tab on the negative electrode current collector through an insulating thin film material and conductive adhesion glue or micro connection. The tab extraction method has the beneficial effects as follows: the problem in tab extraction of the battery on different substrates is solved, and the maximum space utilization of the battery can be realized by the structure; a die is not required in the film plating of the adhesion layer, the positive electrode current collector and the electrolyte film; the negative electrode and the negative electrode current collector only require one die, so that the method is simple, and industrial production can be realized easily; the positive electrode and the negative electrode can be blocked directly by the insulating film to prevent edge contact between positive and negative electrode active materials and the current collector thin films thereof to form short circuit; and in addition, the thickness of the electrode material of the all-solid-state thin film battery can be not limited, so that the safety of the battery is ensured while the battery capacity of the single thin film lithium ion battery is greatly increased.

Description

technical field [0001] The invention relates to the technical field of all-solid-state thin-film lithium-ion batteries, in particular to a method for leading out tabs of all-solid-state thin-film lithium-ion batteries with an upright structure. Background technique [0002] In recent years, lithium-ion batteries have become the first choice for new green energy and portable electronic equipment batteries due to their advantages such as high capacity, high working voltage and no memory effect, and have achieved tremendous development in the field of power energy. However, the current commercial lithium-ion batteries have certain safety hazards due to the use of organic electrolytes that are flammable, explosive and volatile. Using solid electrolyte to replace organic liquid electrolyte and preparing all-solid-state thin-film lithium-ion batteries is the fundamental way to solve the current safety problems of lithium-ion batteries. In addition, compared with current lithium-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/26H01M10/058H01M50/531
CPCH01M10/058H01M50/531Y02E60/10Y02P70/50
Inventor 夏晖孙硕夏求应昝峰徐璟岳继礼
Owner THE NORTHERN RES INST OF NJUST
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