Lithium metal electrode, preparation method thereof, negative electrode of lithium metal secondary battery and battery

A lithium metal electrode and secondary battery technology, which is applied to fuel cell type half cells and secondary battery type half cells, electrode manufacturing, lithium storage batteries, etc., and can solve the problems affecting the stability and cycle performance of lithium metal secondary batteries. , volume expansion, explosion and other problems, to achieve the effect of improving high-current fast charging capability, increasing surface area, and improving safety performance

Active Publication Date: 2017-11-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the process of realizing the present invention, the inventors have found that the prior art has at least the following problems: the existing lithium metal electrodes used for lithium metal secondary batteries will expand in volume during charging and discharging, which affects the performance of lithium metal secondary batteries. Stability and cycle performance; at the same time, during the long-term charge and discharge process, lithium will deposit on the surface of the negative electrode to form lithium dendrites. When the lithium dendrites grow to the point that they can pierce the separator of lithium metal secondary batteries, it will cause a short circuit and cause an explosion.

Method used

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  • Lithium metal electrode, preparation method thereof, negative electrode of lithium metal secondary battery and battery
  • Lithium metal electrode, preparation method thereof, negative electrode of lithium metal secondary battery and battery
  • Lithium metal electrode, preparation method thereof, negative electrode of lithium metal secondary battery and battery

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Embodiment 1

[0049] see figure 1 , the present embodiment provides a lithium metal electrode 100, the lithium metal electrode 100 includes: a foam electrode substrate 1 having a plurality of cell cavities 11, and metal distributed in at least one cell cavity 11 of the foam electrode substrate 1 Lithium particles 2. The material of the foam electrode base 1 is metal foam or carbon foam.

[0050] The metal foam material and the carbon foam material are three-dimensional materials with multiple pore cavity structures. In this embodiment, metal foam material or carbon foam material is used as the electrode substrate of the lithium metal electrode, and metal lithium particles 2 are distributed in at least one cell cavity 11 of the foam electrode substrate 1. The cell cavity 11 of the foam electrode substrate 1 It can effectively limit the volume expansion of the lithium metal particles 2 during charging and discharging, thereby effectively improving the stability and cycle performance of the ...

Embodiment 2

[0060] The present embodiment provides a kind of preparation method of lithium metal electrode, see Figure 5 and combine Figure 6 , the preparation method comprises the following steps:

[0061] Step 201 , preparing a foam electrode base body with multiple pore cavities.

[0062] Step 202, coating metal lithium particles in at least one pore cavity of the foam electrode base body; wherein, the material of the foam electrode base body is a metal foam material or a carbon foam material.

[0063] In the lithium metal electrode prepared by the preparation method provided in this example, the electrode matrix is ​​a foam electrode matrix with a plurality of pore cavities, and lithium metal particles are distributed in at least one pore cavity of the foam electrode matrix. The pores and cavities of the foam electrode matrix can effectively limit the volume expansion of the lithium metal particles during charge and discharge, thereby effectively improving the stability and stabil...

Embodiment 3

[0083] see Figure 8 , and combined with figure 1 and figure 2 , this embodiment provides a negative electrode 300 of a lithium metal secondary battery, and the negative electrode 300 of a lithium metal secondary battery includes: at least one lithium metal electrode 100 provided in any one of the above embodiments.

[0084] In the lithium metal electrode 100 provided in the above embodiment, the pore cavity 11 of the foam electrode matrix 1 can effectively limit the volume expansion of the metal lithium particles 2 during charging and discharging, increase the surface area of ​​the lithium metal electrode, and reduce the formation of lithium dendrites. generation, to avoid the battery short-circuit problem caused by lithium dendrites piercing the separator, therefore, using the lithium metal electrode 100 as the negative electrode of the lithium metal secondary battery can effectively improve the stability, cycle performance, and large capacity of the lithium metal secondar...

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Abstract

The invention discloses a lithium metal electrode, a preparation method thereof, a negative electrode of a lithium metal secondary battery and the battery, and belongs to the technical field of lithium batteries. The lithium metal electrode comprises a foam electrode substrate with a plurality of hole cavities and metal lithium particles distributed in at least one hole cavity of the foam electrode substrate; and the foam electrode substrate is made from a foam metal material or a carbon foam material. The hole cavities of the foam electrode substrate can effectively restrict the volume expansion of the metal lithium particles in the charging and discharging process and reduce the generation of lithium dendrites, so that the stable performance, cycle performance, quick charging performance and safety performance of the lithium metal secondary battery using the lithium metal electrode as the negative electrode are effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium metal electrode and a preparation method thereof, a negative electrode of a lithium metal secondary electrode, and a battery. Background technique [0002] With the continuous development of portable electronic devices and electric vehicles, the research and development of high energy density batteries has become increasingly important. A lithium metal secondary battery is a rechargeable lithium battery with a lithium metal electrode as the negative electrode. According to different cathode materials, lithium metal secondary batteries mainly include lithium metal air batteries and lithium sulfur batteries. Since metal lithium has a very high theoretical specific capacity (3860mAh / g), the most negative reduction potential (-3.04V, relative to the hydrogen standard potential) and a very small density (0.59g / cm 3 ), so the energy density of lithium metal second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/1395H01M4/66H01M4/80H01M10/052H01M12/08
CPCH01M4/134H01M4/1395H01M4/661H01M4/663H01M4/808H01M10/052H01M12/08H01M4/04Y02E60/10
Inventor 王平华李慧夏圣安
Owner HUAWEI TECH CO LTD
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