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Method for preparing lithium-supplementing negative electrode and lithium-supplementing negative electrode

A technology of negative electrode sheet and negative electrode, which is applied in the field of preparation process of lithium-supplemented negative electrode, can solve problems such as potential safety hazards and lithium dendrite formation, and achieve good peeling effect, simple process, and convenient peeling effect

Pending Publication Date: 2022-04-15
CHINA ENERGY LITHIUM
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  • Application Information

AI Technical Summary

Problems solved by technology

For the graphite negative electrode, the first effect has reached about 90%, and the actual required lithium supplement thickness is 1-2.5um. Excessive lithium will generate lithium dendrites, which poses a safety hazard

Method used

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  • Method for preparing lithium-supplementing negative electrode and lithium-supplementing negative electrode
  • Method for preparing lithium-supplementing negative electrode and lithium-supplementing negative electrode
  • Method for preparing lithium-supplementing negative electrode and lithium-supplementing negative electrode

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Embodiment 1

[0040] Negative electrode preparation: use artificial graphite as the negative electrode active material, acetylene black as the conductive agent, and polyvinylidene fluoride (PVDF) as the binder. The above materials are mixed at a weight ratio of graphite: acetylene black: PVDF = 90:5:5, and a certain amount of ultrapure water is added to mix evenly to obtain a mixed slurry. The mixed slurry was coated on both sides of a copper foil (about 6 μm in thickness), dried and compacted to obtain a graphite negative electrode (with a thickness of 160 μm).

[0041]Lithium-supplementing negative electrode 1 Preparation: In a dry workshop with a dew point of -45°C, use an ultra-thin lithium film with a thickness of 5 μm as the lithium-supplementing source, use the above-mentioned negative electrode as the negative electrode to be replenished, and use the upper and lower volumes of lithium and the negative electrode with the help of concave-convex Roller and flat roller (the width of the...

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Abstract

According to the method for preparing the lithium-supplementing negative electrode, part of ultrathin lithium / lithium alloy films are transferred to the upper surface and the lower surface of the negative electrode by means of rolling of the concave-convex roller, and the problem that an existing graphite negative electrode is excessive in lithium supplementing is solved. According to the preparation method, thinning and compounding of the ultrathin lithium or lithium alloy film are realized through one-step rolling, and the preparation method of the lithium-supplementing negative electrode is integrated operation, simplifies the process and can be applied on a large scale and in a large scale.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a preparation process of a lithium-supplementing negative electrode in a lithium-ion secondary battery. Background technique [0002] In 2025, the energy density of power batteries should reach 400wh / kg. In order to achieve such a high energy density, it is necessary to improve the positive and negative electrodes of the battery. For example, the first effect of the negative electrode of graphite, silicon-doped or silicon oxide is lower than that of the positive electrode. It is necessary to increase the first effect of the negative electrode to the level of the first effect of the positive electrode. An additional lithium source is needed to improve the first effect and increase the energy density. For the graphite negative electrode, the first effect has reached about 90%, and the actual lithium supplement thickness is 1-2.5um. Excessive lithium will genera...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/13H01M10/052
CPCY02E60/10
Inventor 郇庆娜齐大志于昆旺刘慧芳吴春敢陈强牟瀚波
Owner CHINA ENERGY LITHIUM
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