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Three-dimensional composite current collector and preparation method thereof

A three-dimensional composite and current collector technology, applied in the field of three-dimensional current collectors and their preparation, can solve the problems such as the lack of improvement in the bonding performance of composite materials and metal lithium, unfavorable battery tab welding and large-scale production, and metal lithium falling off easily. It is beneficial to buffer the electrode polarization reaction, improve the electrochemical performance, and reduce the actual current density.

Pending Publication Date: 2021-04-16
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, metal lithium, as the negative electrode of the battery, has always had three problems in the charging and discharging process: the lithium dendrite problem generated when lithium ions are reduced during the charging process of the lithium battery; the extremely high chemical reactivity of metal lithium and organic solvents leads to Low coulombic efficiency; volume change caused by metal lithium deposition and dissolution process
This method can efficiently prepare a large number of three-dimensional current collectors, but the disadvantage of this method is that it is directly processed on the copper foil, the process is complicated, the cost is high, and the unit weight is heavy, which is not conducive to the tab welding of the battery cell. and mass production
The composite material has the advantages of high potential and no dendrites in the process of repeated charging and discharging, but the disadvantage of this method is that the connection performance between the composite material and metal lithium is not improved, resulting in the metal lithium on the negative electrode being easy to fall off.

Method used

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  • Three-dimensional composite current collector and preparation method thereof
  • Three-dimensional composite current collector and preparation method thereof

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preparation example Construction

[0040] The invention provides a method for preparing a three-dimensional composite current collector, comprising the following steps:

[0041] S1. Weigh a predetermined amount of carbon material, lithium-friendly metal oxide and lithium salt, mix and stir for 0.5-4 hours; add solvent and stir for 0.5-2 hours until completely dissolved; then add a predetermined amount of binder, stir for 4-10 hours, and prepare Obtain lithium battery negative electrode lithium-friendly material slurry;

[0042] S2. Select a copper foil with a thickness of 6-20 μm as the base layer, apply the slurry on the copper foil at a coating speed of 10-30 m / min, and then dry it in a blast drying oven at 70-80°C for 4- 8h, and then dried in a vacuum oven at 110-130°C for 8-12h to prepare a three-dimensional composite current collector.

[0043] Further, the solvent is one of water and N-methylpyrrolidone.

[0044] Further, in step S1, the mass ratio of the carbon material, the lithium-philic metal oxide,...

Embodiment 1

[0051] Preparation method of three-dimensional composite current collector:

[0052] S1. Weigh 30g of carbon nanotubes and 55g of copper oxide particles in a stirring tank and stir for 2 hours; then add 10g of lithium carbonate into the stirring tank and stir for 2 hours, then add an appropriate amount of N-methylpyrrolidone, and stir for 2 hours until completely dissolved; then Add 5 g of polyvinylidene fluoride into the stirring tank and stir for 10 hours to prepare a lithium battery negative electrode lithium-friendly material slurry;

[0053] S2. Select a copper foil with a thickness of 8 μm and no impurities on the surface as the base layer, apply the slurry on the copper foil, apply it with a coating machine at a coating speed of 10m / min, and then place it on the air to dry Baking in an oven at 75°C for 4 hours, and finally baking in a vacuum oven at 120°C for 12 hours to prepare a three-dimensional composite current collector.

[0054] see Figure 1-5 The three-dimens...

Embodiment 2

[0076] Preparation method of three-dimensional composite current collector:

[0077] S1. Weigh 30g of carbon nanotubes and 55g of zinc oxide particles in a stirring tank and stir for 2 hours; then add 10g of lithium carbonate into the stirring tank and stir for 2 hours, then add an appropriate amount of N-methylpyrrolidone, and stir for 2 hours until completely dissolved; then Add 5g of polyacrylonitrile LA133 into the stirring tank and stir for 10h to prepare lithium battery negative electrode lithium-friendly material slurry;

[0078] S2. Select a copper foil with a thickness of 8 μm and no impurities on the surface as the base layer, apply the slurry on the copper foil, apply it with a coating machine at a coating speed of 10m / min, and then place it on the air to dry Baking in an oven at 75°C for 4 hours, and finally baking in a vacuum oven at 120°C for 12 hours to prepare a three-dimensional composite current collector.

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Abstract

The invention provides a three-dimensional composite current collector and a preparation method thereof. The three-dimensional composite current collector provided by the invention comprises a copper foil base layer and a lithium battery negative electrode lithium-philic material coating coated on the copper foil base layer, wherein the lithium battery negative electrode lithium-philic material coating comprises a plurality of micron-sized three-dimensional spherical structures, and the lithium battery negative electrode lithium-philic material is composed of a carbon material, a lithium-philic metal oxide, a binder and a lithium salt. The preparation method comprises the following steps: firstly, preparing lithium battery negative electrode lithium-philic material slurry, then coating a copper foil base layer with the slurry to form a lithium battery negative electrode lithium-philic material coating, and preparing the lithium battery negative electrode three-dimensional composite current collector. According to the lithium battery negative electrode lithium-philic material, a copper foil is coated with a composite coating with a micron-sized three-dimensional spherical structure, so that the current density of a lithium metal negative electrode can be effectively reduced, the generation of lithium dendrites is effectively relieved and reduced, and the cycle performance and the safety performance of a lithium metal battery are improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a three-dimensional current collector and a preparation method thereof. Background technique [0002] Lithium-ion batteries, which are currently commercially successful, have the characteristics of high working voltage, long cycle life, and no memory effect, and have been widely used in electric vehicles, mobile electronic devices and other fields. However, with economic development and technological progress, higher requirements are placed on the energy density of lithium-ion batteries. Traditional lithium-ion batteries mostly use graphite as the negative electrode material, and their theoretical capacity is limited. Today's commercial lithium-ion batteries are getting closer to their theoretical specific capacity. Therefore, it is necessary to seek and develop lithium batteries with higher energy density. The theoretical energy density of metal lithium anode materials can be ...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCY02E60/10
Inventor 曹元成汤舜张炜鑫
Owner HUAZHONG UNIV OF SCI & TECH
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