A kind of lithium ion energy storage device, its pre-lithiation, and preparation method

A lithium-ion, pre-lithiation technology, applied in the direction of structural parts, electrical components, final product manufacturing, etc., can solve the problems of increasing manufacturing costs, difficulty in coating tutorials, increasing manufacturing costs, etc., to avoid changes in battery thickness and manufacturing process. Simple and controllable, reducing the effect of pre-lithiation internal resistance

Active Publication Date: 2022-07-01
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this method, the lithium-containing third electrode is usually placed on the outer surface or between some inner layers in the direction parallel to the electrode sheet, and at the same time, in order to make lithium ions pass through the foil to reach the surface of the remaining electrodes during the process of pre-intercalating lithium , it is necessary to make holes on the foil, such as electrochemically corroding the foil to form micro-holes that are partially penetrated, or using laser and mechanical stamping to make holes on the foil, which greatly increases the production cost
Moreover, although this method solves the problem of pre-intercalating lithium in the negative electrode, it will seriously restrict the subsequent coating process. When coating the first side, the material will leak to the second side, which greatly affects the coating process. The difficulty of coating greatly reduces the efficiency of coating and further increases the manufacturing cost. At the same time, the holes on the foil will lead to a series of other problems such as the decrease of the strength of the foil and the decrease of electrical conductivity, which will affect the electrochemical performance of the prepared lithium-ion energy storage device.
This phenomenon lies in the fact that the coating thickness is usually less than 50 μm or even lower power devices, and the aluminum foil with a foil thickness of less than 10 μm and the copper foil with a thickness of less than 6 μm are more serious, which brings great impact to the preparation of these lithium-ion energy storage devices. Difficulties

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  • A kind of lithium ion energy storage device, its pre-lithiation, and preparation method

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preparation example Construction

[0044] According to another aspect of the present invention, a preparation method for preparing a lithium ion energy storage device is also proposed, comprising the following steps:

[0045] Step 1) coating or rolling the negative electrode slurry on the current collector to prepare a negative electrode sheet;

[0046] Step 2) coating or rolling the positive electrode slurry on the current collector to prepare a positive electrode sheet;

[0047] Step 3) preparing the prepared positive electrode sheet, negative electrode sheet and electrolyte or separator into a battery cell;

[0048] Step 4) pre-lithiation electrodes are arranged at a predetermined distance outside the cell and in the vertical direction of the positive and negative electrode sheets;

[0049] Step 5) injecting liquid into the energy storage device;

[0050] Step 6) Charge or discharge the pre-lithiation electrode, the positive electrode and the negative electrode, and perform pre-lithiation, so that the lith...

Embodiment 1

[0055] According to Embodiment 1 of the present invention, a method for preparing the above-mentioned lithium ion energy storage device is provided, and further pre-lithiation is performed, which specifically includes: mixing graphite, hard carbon, and carbon black in a mass ratio of 80:10:5 and an appropriate amount of sodium carboxymethyl cellulose solution, styrene-butadiene rubber emulsion and an appropriate amount of deionized water to prepare a negative electrode slurry for lithium ion batteries, and the slurry was extruded and coated on a copper foil with a thickness of 6um without through holes. , dried at 120°C and rolled to a suitable areal density, and then cut into a lithium-ion battery negative electrode sheet with a size of 70*105mm. Lithium-ion battery cathode slurry was prepared with the mass ratio of 12 μm and an appropriate amount of nitrogen-methylpyrrolidone. The slurry was extruded and coated on a 12um-thick aluminum foil without through-holes, dried at 120...

Embodiment 2

[0057] According to Embodiment 2 of the present invention, another method for preparing the above-mentioned lithium ion energy storage device is provided, and further pre-lithiation is performed, specifically comprising: mixing hard carbon and carbon black in a mass ratio of 90:5 and an appropriate amount of Sodium carboxymethyl cellulose solution, styrene-butadiene rubber emulsion and an appropriate amount of deionized water were used to prepare lithium-ion battery negative electrode slurry. After drying at ℃ and rolling to a suitable surface density, it is cut into a lithium-ion battery negative electrode sheet with a size of 70*105mm, and the activated carbon material, carbon black, and polyvinylidene fluoride are mixed in a mass ratio of 80:10:10 and an appropriate amount of nitrogen. - Methyl pyrrolidone is prepared as a positive electrode slurry for lithium ion batteries. The slurry is extruded and coated on an aluminum foil with a thickness of 12um without through-holes,...

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Abstract

The invention provides a lithium ion energy storage device, its pre-lithiation, and a preparation method. Specifically, one or more lithium ion energy storage devices are provided at a predetermined distance outside the cell of the lithium ion energy storage device and in a direction perpendicular to the pole piece. The pre-lithiation electrode is then charged or discharged by the pre-lithiation electrode and the positive electrode and the negative electrode, so that the lithium ions in the pre-lithiation electrode pass through the gap between the positive electrode, the negative electrode and the separator along the direction parallel to the electrode sheet. Entering the inside of the electrode, this pre-lithiation method avoids the design scheme that lithium ions must pass through the pole piece of the energy storage device in the vertical direction in the traditional pre-lithiation method, and completely overcomes the need for positive and negative foils to be holes. The disadvantages of foil and the resulting adverse effects on the preparation efficiency and finished product quality make the preparation process simpler and more controllable. At the same time, this technology can also be used for the secondary lithium replenishment operation of finished lithium ion energy storage devices, which is a lithium ion energy storage device. The regeneration of the energy storage device helps.

Description

technical field [0001] The invention belongs to the technical field of pre-lithiation methods for lithium-ion energy storage devices, and in particular relates to a lithium-ion energy storage device suitable for the preparation of non-porous foils, its pre-lithiation, and a preparation method. Background technique [0002] Novel anode materials such as hard carbon materials, silicon-based materials, and graphene materials usually have higher specific capacity and better rate performance than traditional graphite materials, which are important for developing lithium-ion energy storage devices with higher energy and power density. However, these materials usually have low first-time efficiency, and they need to be pre-lithiated in the actual use process so that the performance of the material can be fully exerted. [0003] At present, there are various pre-lithiation schemes to choose from, among which the use of the third electrode containing lithium to pre-lithiate the negat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/0525H01M10/0585
CPCH01M4/13H01M4/139H01M10/0525H01M10/0585Y02P70/50Y02E60/10
Inventor 安亚斌马衍伟孙现众张熊
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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