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Packaging method of metal lithium reference electrode for lithium battery

A packaging method and reference electrode technology, which are applied in battery electrodes, non-aqueous electrolyte battery electrodes, lithium batteries, etc., can solve the problems of complex operation, inability to balance effectiveness and practicability, and high cost, and achieve simple process and improved Practicality and service life, the effect of improving the level of practicality

Active Publication Date: 2020-12-08
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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  • Packaging method of metal lithium reference electrode for lithium battery
  • Packaging method of metal lithium reference electrode for lithium battery
  • Packaging method of metal 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 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 a size of 1×0.01mm, and it is placed between the positive and negative electrodes at the center, and separated from the positiv...

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 packaging method of a metal lithium reference electrode for a lithium battery, and belongs to the technical field of batteries. The metal lithium reference electrode comprises a current collector, a lithium electrode material and a packaging layer. The lithium electrode material is connected with the current collector, the packaging layer wraps the lithium electrode material and the part connected with the current collector, and the other end of the lithium electrode material is exposed in the electrolyte; the packaging layer is an aluminum foil composite film with alayered structure, and sequentially comprises a first polymer layer, a second metal aluminum layer and a third polymer layer from outside to inside. The packaging method is simple and easy to implement, high in operability, high in mechanization degree and suitable for large-scale production, the prepared reference electrode is diverse in size and high in adaptability and has high humid air blocking capacity, only part of active materials are exposed during use, ion exchange is guaranteed, and loss of the active materials is reduced to the maximum extent. Therefore, the reference electrode cankeep long-acting quality and potential stability in storage, transportation and use, and the practical level of the reference electrode for the lithium battery is further improved.

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 Applications(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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