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Preparation method and application of lithium tin alloy powder for lithium ion battery negative electrode

A lithium-ion battery, tin alloy technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as industrialization difficulties, complexity, and cost increase, and achieve simple and feasible preparation methods, broad development prospects, and technology. mature effect

Inactive Publication Date: 2020-06-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other inert lithium powders have a similar process, and it can be seen from these steps that the process of "inertization" is complicated, and the cost is increased, and industrialization is difficult. Therefore, if a simple preparation process can be used Cheap lithium powder can be obtained, which is of great significance to the development of pre-lithiation

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  • Preparation method and application of lithium tin alloy powder for lithium ion battery negative electrode
  • Preparation method and application of lithium tin alloy powder for lithium ion battery negative electrode
  • Preparation method and application of lithium tin alloy powder for lithium ion battery negative electrode

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preparation example Construction

[0042] like Figure 1~4 Shown, in the embodiment of the present invention, a kind of preparation method of lithium-tin alloy powder for negative electrode of lithium ion battery comprises the following steps:

[0043] Step 1: Flatten the tin-based foil and the lithium strip together to obtain a stacked metal sheet;

[0044] Step 2: In a dry and oxygen-free environment, the stacked metal sheets are pressed by a pressure device, so that the tin-based foil is completely embedded in the lithium strip, and a lithium-tin alloy metal sheet is obtained;

[0045] Step 3: In a dry and oxygen-free environment, the lithium-tin alloy metal sheet is ground into lithium-tin alloy powder.

[0046] Among them, in step 1, wipe the surface of the tin-based foil with alcohol, roll it repeatedly with a roller press until it is flat, then cut the lithium strip into the same size as the tin-based foil, and place the tin-based foil in the glove box It is flatly attached to the lithium strip, the th...

Embodiment 1

[0052] A pure tin foil with a thickness of 15 μm and a lithium strip with a thickness of 40 μm were selected, pressed in a glove box at 30 MPa for 5 hours with a tablet press, and after grinding, a lithium-tin alloy powder with a particle size of 50 μm was obtained.

[0053] When the anode is a slurry, the powder is added to the hard carbon anode material slurry. That is, in the pulping process, the lithium-tin alloy powder is uniformly mixed with the active material, binder and conductive agent to prepare a pre-lithiated negative electrode sheet, which can improve the first-cycle Coulombic efficiency and cycle stability.

[0054] When the negative pole is used as the pole piece, the lithium-tin alloy powder is hot pressed into the pole piece for lithium supplementation. That is to add lithium-tin alloy powder to the surface of the negative pole piece, and use a hot press to roll it, so that the lithium-tin alloy powder and the pole piece are combined to complete the pre-lithi...

Embodiment 2

[0056] Select a 20 μm thick tin-copper alloy foil (wherein, the mass percentage of tin is 90%, and the mass percentage of copper is 10%) and a 50 μm thick lithium strip, in a glove box, under 40MPa, use a tablet press for 5h , after grinding, a lithium-tin alloy powder with a particle size of 10 μm was obtained.

[0057] When the anode is a slurry, the powder is added to the silicon or silicon-carbon composite material slurry. That is, in the pulping process, the powder is uniformly mixed with active materials, binders, and conductive agents to prepare pre-lithiated pole pieces, which can improve the first-cycle Coulombic efficiency and cycle stability.

[0058] When the negative pole is used as the pole piece, the lithium-tin alloy powder is hot pressed into the pole piece for lithium supplementation. That is to add lithium-tin alloy powder to the surface of the negative pole piece, and use a hot press to roll it, so that the lithium-tin alloy powder and the pole piece are c...

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Abstract

The invention provides a preparation method and application of lithium tin alloy powder for a lithium ion battery negative electrode, and the preparation method is characterized by comprising the following steps: step 1, flatly attaching tin-based foil and a lithium strip together to obtain a stacked metal sheet; step 2, in a dry and oxygen-free environment, pressing the stacked metal sheets through pressure equipment, so that the tin-based foil is completely embedded into the lithium strip, and a lithium-tin alloy metal sheet is obtained; and step 3, grinding the lithium-tin alloy metal sheetinto lithium-tin alloy powder through grinding equipment in a dry and oxygen-free environment. The particle size of the prepared lithium-tin alloy powder is 10 [mu]m-100 [mu]m, and the lithium-tin alloy powder is added into a negative electrode to supplement lithium, so that the first-circle coulombic efficiency and the cycling stability of the battery can be improved. The lithium tin alloy powder for the negative electrode of the lithium ion battery is simple in preparation operation and mature in technology, and can be used for supplementing lithium for various negative electrode materials,so that the lithium tin alloy powder has a very wide development prospect in a lithium supplementing process of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion secondary batteries, and in particular relates to a preparation method and application of lithium-tin alloy powder for negative electrodes of lithium-ion batteries. Background technique [0002] During the first charging process of a lithium-ion battery, the organic electrolyte will undergo reduction and decomposition on the surface of the negative electrode material to form a solid electrolyte phase interface (SEI), which permanently consumes a large amount of lithium from the positive electrode, resulting in the first cycle Coulombic efficiency (ICE) Low, reducing the lithium-ion battery capacity and energy density. For common anode materials, graphite has a first irreversible lithium loss of 5% to 10%. For high-capacity anode materials, this effect is more significant, and the irreversible capacity loss of silicon can reach 15% to 35%, thus supplementing the loss. Lithium is very important for lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/40H01M10/0525
CPCH01M4/405H01M10/0525H01M2004/027Y02E60/10
Inventor 孙欣李洒黄云辉胥会张灿陈鑫龙刘文健
Owner TONGJI UNIV
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