A kind of encapsulation method of metallic lithium reference electrode for lithium battery

A technology of reference electrode and encapsulation method, which is applied to battery electrodes, non-aqueous electrolyte storage battery electrodes, lithium storage batteries, etc., can solve the problems of complex operation, high cost, and inability to balance effectiveness and practicability, and achieve simple process and improved The level of practicality, the effect of suppressing the phenomenon of humid air and electrolyte corrosion

Active Publication Date: 2022-02-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods cannot balance effectiveness and practicability, either it is difficult to form a dense coating to block the entry of moist air, or the operation is complicated and costly

Method used

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  • A kind of encapsulation method of metallic lithium reference electrode for lithium battery
  • A kind of encapsulation method of metallic lithium reference electrode for lithium battery
  • A kind of encapsulation method of metallic lithium reference electrode for lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Preparation of reference electrode: In a dry room environment, use a roller press to roll 5 μm ultra-thin lithium foil onto a clean copper foil on both sides, and then cut it into strips of 0.1×8cm in size;

[0033] 2) Encapsulation of the reference electrode: use polyethylene terephthalate with a total thickness of about 18 μm, the first polymer layer is 12 μm thick, the second metal aluminum layer is an aluminum layer of 0.3 μm, and the third polymer layer is The material of the object layer is aluminum-coated composite film of 6 μm thick polyethylene, after covering the electrode, the reference electrode is packaged by hot pressing, and then the excess part is cut;

[0034] 3) Press figure 2 Assembled three-electrode full cell shown:

[0035] When the reference electrode 6 is assembled, the tip is cut off to expose an active material with an area of ​​1×0.01mm, which is placed between the positive and negative electrodes and at the center, and separated from the...

Embodiment 2

[0041] 1) Preparation of the reference electrode: use a paint remover to remove the paint from both ends of the enamelled aluminum wire with a diameter of 130 μm, ultrasonically clean it with anhydrous ethanol and then dry it, then wrap a 33 μm ultra-thin lithium ribbon on the depainted end of the aluminum wire ;

[0042] 2) Encapsulation of the reference electrode: use polytetrafluoroethylene with a total thickness of about 1 μm, the first polymer layer is 0.6 μm thick, the second metal aluminum layer is an aluminum layer of 0.3 μm, and the third polymer layer is made of After the electrode is covered with aluminized film of 0.1μm thick polypropylene, the reference electrode is packaged by hot pressing, and then the excess part is cut;

[0043] 3) Three-electrode full battery assembly: the negative electrode uses a 50 μm double-sided roll-pressed 4×7 cm lithium metal sheet on the copper grid; the positive electrode uses commercial double-sided LiNi 0.8 co 0.1 mn 0.1 o 2 (...

Embodiment 3

[0047] 1) Preparation of reference electrode: Place one end of a 4×7cm clean nickel mesh in 0.1mol / L silver nitrate solution for 2 seconds, so that the surface of the nickel mesh is evenly covered with metallic silver particles, and after drying, place the end of the clean nickel mesh under an argon atmosphere. Immerse in molten lithium at 200°C, take out and coat the surface of the nickel mesh with a layer of metal lithium after cooling;

[0048] 2) Encapsulation of the reference electrode: use polyamide with a total thickness of 100 μm, 30 μm thick polyamide for the first polymer layer, 40 μm aluminum metal foil for the second metal aluminum layer, and 30 μm thick ethylene-acrylic acid for the third polymer layer material After the electrode is covered with the aluminum-plastic film of the copolymer, the reference electrode is packaged by hot pressing, and then the excess part is cut;

[0049] 3) Three-electrode full battery assembly: the negative electrode uses a 50 μm doub...

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Abstract

The invention discloses a method for packaging metal lithium reference electrodes for lithium batteries, which belongs to the technical field of batteries. Including current collector, lithium electrode material, encapsulation layer; the lithium electrode material is connected to the current collector, the encapsulation layer wraps the lithium electrode material and the part connected to the current collector, and the other end of the lithium electrode material is exposed to the electrolyte; the encapsulation layer is a layered structure The aluminum foil composite film, from the outside to the inside, is the I polymer layer, the II metal aluminum layer and the III polymer layer. The encapsulation method of the present invention is simple, easy to operate, highly mechanized, and suitable for large-scale production. The prepared reference electrodes are diverse in size, strong in adaptability, and have strong moisture barrier ability. Some active materials ensure ion exchange and minimize the loss of active materials, so that the reference electrode can maintain long-term quality and potential stability during storage, transportation and use, and further improve the practical level of reference electrodes for lithium batteries .

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for packaging metal lithium reference electrodes for lithium batteries. Background technique [0002] The energy crisis and environmental concerns give birth to sustainable energy storage and conversion technologies. As the focus of this field, the application of lithium-ion batteries has greatly enriched people's mobile lifestyle, and lithium metal batteries for long battery life and high energy have also attracted the attention of the industry. Generally, lithium batteries are a two-electrode system consisting of a working electrode and a counter electrode. The information obtained from the test is also the result of bipolar coupling. It is difficult to detect and study the behavior of electrodes alone. In addition, the flowing current further polarizes the electrodes, deviates from the equilibrium potential, and inevitably introduces errors. The integr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/052G01R19/00
CPCH01M4/13H01M4/139H01M10/052G01R19/0084Y02E60/10
Inventor 黄佳琦肖也许睿闫崇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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