Pre-lithiated lithium ion secondary battery negative electrode material and mechanical pre-lithiation method thereof

A technology for secondary batteries and negative electrode materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrode manufacturing, etc., can solve the problems of high price, high energy consumption, flammability and explosion of inert lithium powder, and achieve high first coulomb. Efficiency and stable cycle life, avoiding lithium dendrite problems, and the effect of short fabrication times

Active Publication Date: 2020-11-17
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, inert lithium powder is not only expensive, but also flammable and explosive, which may bring safety hazards, so it is not suitable for wide application at all.
However, the pre-lithiation process of electrochemical deposition is complex, high energy consumption, low efficiency, and requires the introduction of organic solutions, so it is not suitable for large-scale applications.

Method used

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  • Pre-lithiated lithium ion secondary battery negative electrode material and mechanical pre-lithiation method thereof
  • Pre-lithiated lithium ion secondary battery negative electrode material and mechanical pre-lithiation method thereof
  • Pre-lithiated lithium ion secondary battery negative electrode material and mechanical pre-lithiation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1 It is a schematic diagram of mechanical pre-lithiation preparation by stacking tin foil and lithium tape in Example 1 of the present invention.

[0033] like figure 1 As shown, the mechanical pre-lithiation method based on the negative electrode material of the lithium ion secondary battery in this embodiment includes the following steps:

[0034] Step 1, prepare 50μm tin foil.

[0035] Step 2, in the drying room, the lithium tape with a thickness of 25 μm and the tin foil are flatly bonded together to obtain a bonding material.

[0036] Step 3, the distance between the two rollers of the roller press is set to be smaller than the total thickness of the laminated material, the laminated material is rolled 5-10 times by the roller press, and the two rollers are rolled after each rolling. The distance before each roller is adjusted to be small, and the pre-lithiated tin negative electrode material of 50 μm-60 μm is obtained after the rolling is completed.

[...

Embodiment 2

[0042] The mechanical pre-lithiation method based on the negative electrode material of the lithium ion secondary battery in this embodiment includes the following steps:

[0043]Step 1, prepare 15μm-100μm tin-based alloy foil, the tin-based alloy foil can be Cu-Sn, Co-Sn, Ag-Sn, Cu-Ag-Sn, Zn-Sn, Sb-Sn, Bi-Sn, In-Sn, In-Bi-Sn and other tin alloys;

[0044] Step 2, in the drying room, flatly attach a lithium tape with a thickness of 1 / 10 to 1 of the thickness of the tin-based alloy foil to the tin-based alloy foil to obtain a bonding material;

[0045] Step 3, press the laminated material in step 2 for 15min-2h under the pressure of 5MPa-30MPa by a tablet machine, so that the lithium ribbon is completely embedded in the tin-based alloy foil to obtain a pre-lithiated lithium ion secondary battery negative electrode material.

Embodiment 3

[0047] The mechanical pre-lithiation method based on the negative electrode material of the lithium ion secondary battery in this embodiment includes the following steps:

[0048] Step 1, prepare 15μm-100μm aluminum metal foil or aluminum-based alloy foil as a self-supporting battery negative pole piece;

[0049] Step 2, in the drying room, flatly attach a lithium tape with a thickness of 1 / 10 to 1 of the thickness of the self-supporting battery negative pole piece to the battery negative electrode material to obtain a bonding material;

[0050] In step 3, the laminated material obtained in step 2 is pressed for 15min-2h by a tablet press under a pressure of 5MPa-30MPa to obtain a pre-lithiated aluminum negative electrode material.

[0051] Figure 4 This is a physical diagram of the pre-lithiated aluminum negative electrode material in Example 3 of the present invention.

[0052] like Figure 4 As shown, lithium metal can be embedded in the aluminum-based alloy foil, and t...

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Abstract

The invention provides a pre-lithiated lithium ion secondary battery negative electrode material and a mechanical pre-lithiation method. The mechanical pre-lithiation method comprises the following steps: step 1, preparing a sheet-shaped battery negative electrode pole piece with a predetermined thickness; step 2, placing a lithium strip with a predetermined thickness and the sheet-shaped batterynegative electrode material in a dry environment, and flatly laminating the lithium strip and the sheet-shaped negative electrode material together to obtain a laminated material; and step 3, pressingthe bonding material obtained in the step 2 through pressure equipment to obtain the pre-lithiated secondary battery negative electrode material.

Description

technical field [0001] The invention belongs to the field of battery negative electrode material preparation, and particularly relates to a pre-lithiated negative electrode material of a lithium ion secondary battery and a mechanical pre-lithiation method thereof. Background technique [0002] As an important energy storage device, lithium-ion secondary batteries have the advantages of high operating voltage, large specific capacity, long cycle life, low self-discharge, and environmental friendliness. They have been widely used in electronic devices such as notebook computers, mobile phones, and aerospace. application. However, with the development of society, energy crisis and environmental pollution have posed a huge threat to the sustainable development of human society. Therefore, the development of power sources with higher energy density and green environmental protection is imminent. At present, the development of new high-capacity, high-voltage lithium-ion battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1395H01M4/04H01M4/13H01M4/134
CPCH01M4/0435H01M4/13H01M4/134H01M4/139H01M4/1395Y02E60/10
Inventor 胥会李洒黄云辉樊慧敏余跃张灿陈鑫龙刘文健
Owner TONGJI UNIV
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