Lithium-containing negative plate and preparation method thereof

A technology for lithium negative electrodes and pole pieces, which is applied in the field of lithium-containing negative electrodes and its preparation, can solve the problems of limited improvement, low discharge capacity, and difficult application, and achieves good current collection and heat dissipation effects, simple preparation methods, and reproducibility. highly operable effect

Inactive Publication Date: 2017-05-31
TIANJIN LISHEN BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of metal lithium sheet as the negative electrode of lithium battery, it is possible that some segments of metal lithium will be consumed, resulting in the reduction or even blockage of the current path, the battery cannot be discharged normally in the later stage, and the discharge capacity is low; in lithium-ion secondary batteries , it may also lead to partial recharging, rapid degradation of battery cycle performance, and even the formation of lithium dendrites, resulting in safety issues
In addition, the disadvantages of soft material and poor mechanical strength of lithium metal make the battery preparation process very difficult when lithium metal is used as the negative electrode.
[0003] The conventional solution to these problems is to increase the lithium content and use a large excess of lithium to ensure the continuity of the lithium sheet and the current collection in the later stage of discharge. However, the problem with this approach is that a large amount of excessive metal lithium has safety problems. As the amount increases, the power of fire and explosion also increases. At the same time, excessive lithium sheets also lead to the loss of effective space in the battery, and the volume specific energy of the battery is greatly reduced (the density of metal lithium is 0.534g/cm3, which is much lower than that of conventional lithium batteries. The compacted den

Method used

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  • Lithium-containing negative plate and preparation method thereof
  • Lithium-containing negative plate and preparation method thereof
  • Lithium-containing negative plate and preparation method thereof

Examples

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Effect test

Embodiment 1

[0037] Such as figure 2 As shown, the lithium-containing negative electrode sheet described in this embodiment is prepared by the following method:

[0038] (1) Lithium ribbon cutting: Cut the 0.05mm thick lithium ribbon into 60mm wide*1000mm long.

[0039] (2) Metal foil cutting: cut metal copper foil into 62mm wide * 1050mm long, the mechanical thickness of the copper foil is 15μm, both sides of the copper foil are oxidized and roughened, and the specific surface area of ​​the copper foil is increased by 100 after roughening times, the surface microstructure is particle protrusions, the roughness Ra is about 1.4 μm, and Rz is about 4.5.

[0040] (3) Electrode lamination: Use flat lamination equipment, the effective size of the upper and lower lamination plates is 150mm*200mm, and the equipment pressure is set at 0.5MPa; the pole piece is prepared with a sandwich structure of two layers of lithium sandwiched by a layer of copper foil , and wrap the upper and lower parts of...

Embodiment 2

[0043] Such as image 3 As shown, the lithium-containing negative electrode sheet described in this embodiment is prepared by the following method:

[0044] (1) Lithium ribbon cutting: Cut the 0.05mm thick lithium ribbon into 60mm wide*80mm long.

[0045](2) Metal foil cutting: The metal copper foil is processed into irregular small pieces with a punching die and a punching knife, consisting of two squares. The size of the large square is 62mm wide * 82mm long (bonded with the lithium sheet); the small square size is 15mm * 10mm, which is used as the tab for current collection. The mechanical thickness of the metal copper foil is 10 μm, and both sides of the copper foil are oxidized and roughened. After roughening, the specific surface area of ​​the copper foil is increased by about 100 times. is 3.6.

[0046] (3) Pole piece lamination: Plane lamination equipment is used, the effective size of the upper and lower lamination plates is 150mm*200mm, and the equipment pressure ...

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Abstract

The invention discloses a lithium-containing negative plate. The lithium-containing negative plate comprises a lithium-containing metal belt, a metal foil and a current collector tab, wherein the size of the metal foil is matched with the size of the lithium-containing metal belt, the lithium-containing metal belt is formed by an upper layer and a lower layer, the metal foil is clamped between the upper layer and lower layer of the lithium-containing metal belt, the lithium-containing metal belt and the metal foil are laminated together by virtue of a laminating device to form a compact combination body, and the metal foil has the characteristic of a rough surface. By adopting a particular structural design and innovative implementation method, the lithium-containing negative plate provided by the invention has the advantages of flat thickness, good current collector effect, good heat dissipation effect, high combination force of the lithium belt and a current collector, and the like, can be used for automatic mass production of batteries, and is very applicable to high-energy density battery systems such as a lithium-sulfur battery, a full-solid lithium ion battery, a different-system primary lithium battery and the like; and the provided plate preparation method is simple, high in operability and suitable for mass production.

Description

technical field [0001] The invention relates to the technical field of lithium battery packs, in particular to a lithium-containing negative electrode sheet and a preparation method thereof. Background technique [0002] Lithium has high electrochemical equivalent and lively performance. Using metal lithium as the negative electrode of the battery can obtain high specific energy, because it is widely used in lithium primary batteries such as lithium manganese dioxide, lithium fluoride, and lithium thionyl chloride, as well as lithium sulfur, all Lithium secondary batteries such as solid-state lithium-ion batteries. During the use of metal lithium sheet as the negative electrode of lithium battery, it is possible that some segments of metal lithium will be consumed, resulting in the reduction or even blockage of the current path, the battery cannot be discharged normally in the later stage, and the discharge capacity is low; in lithium-ion secondary batteries , It may also l...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/08H01M4/13H01M4/40H01M4/64H01M4/66
CPCH01M4/04H01M4/08H01M4/13H01M4/405H01M4/64H01M4/661H01M4/667Y02E60/10
Inventor 阳晓霞杜建平段征王玉龙冯辉
Owner TIANJIN LISHEN BATTERY
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