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Lithium metal negative electrode composite current collector, preparation method thereof and lithium ion battery

A lithium metal negative electrode and current collector technology, which is applied in the direction of electrode carrier/current collector, battery electrode, secondary battery, etc., can solve the problems of poor wettability and low binding force of current collector materials, and achieve improved battery safety and stability, preparation The method is simple and effective in inhibiting the growth of lithium dendrites

Pending Publication Date: 2020-12-11
SHENZHEN INST OF ADVANCED TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide a lithium metal negative electrode composite current collector and its preparation method, aiming to solve the problem that the existing lithium metal negative electrode is easy to form lithium dendrites on the surface of the current collector, and has poor wettability and poor binding force with the current collector material. low problem

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  • Lithium metal negative electrode composite current collector, preparation method thereof and lithium ion battery
  • Lithium metal negative electrode composite current collector, preparation method thereof and lithium ion battery
  • Lithium metal negative electrode composite current collector, preparation method thereof and lithium ion battery

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preparation example Construction

[0030] The second aspect of the embodiment of the present application provides a method for preparing a lithium metal negative electrode composite current collector, comprising steps:

[0031] The metal base layer is obtained, and a transition metal boride layer is formed on at least one surface of the metal base layer to obtain a lithium metal negative electrode composite current collector.

[0032]The preparation method of the lithium metal negative electrode composite current collector provided in the second aspect of the present application is to obtain the lithium metal negative electrode composite current collector after forming a transition metal boride layer on at least one surface of the metal base layer. The preparation method is simple and suitable for large-scale industrialization production and application. When the composite current collector is applied to a lithium ion battery, the negative electrode lithium metal layer is arranged on the surface of the transiti...

Embodiment 1

[0051] A lithium metal negative electrode composite current collector adopts titanium as the base metal substance, and uses titanium diboride as the wetting layer, wherein the thickness of the titanium diboride wetting layer is 3 μm. Concrete preparation process is as follows:

[0052] (1) With titanium foil as the base layer material, plasma cleaning is first performed by glow discharge, where the working pressure is 0.6Pa, the bias voltage is -80V, and the cleaning time is 30 minutes;

[0053] (2) After cleaning, use titanium diboride as the sputtering target for sputtering deposition, where the sputtering power is 1KW, the working pressure is 0.6Pa, and the thickness of the film is controlled to be about 3 μm;

[0054] (3) After step 2 is completed, the titanium diboride target is closed, and the sample is taken out from the vacuum coating chamber to obtain a composite current collector.

Embodiment 2

[0056] A lithium metal negative electrode composite current collector adopts titanium as the base metal substance and titanium diboride as the wetting layer, wherein the thickness of the titanium diboride wetting layer is 3 μm, and the titanium diboride wetting layer is produced by chemical vapor deposition. Concrete preparation process is as follows:

[0057] (1) Using titanium foil as the base layer material, first put the material into absolute ethanol for ultrasonic cleaning, then take it out and dry it and put it in a drying box for later use;

[0058] (2) Turn on the mechanical pump and the molecular pump respectively, when the pressure in the vacuum chamber drops to 2.0×10 -3 At Pa, turn on the heater to heat to 100°C to remove the water vapor in the vacuum chamber, and flow 100mL / min argon gas into the vacuum chamber for 20min to remove the unextracted air. Clean the sample surface with 3300V pulse bias for 20min;

[0059] (3) After cleaning, keep the pulse voltage 3...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to a lithium metal negative electrode composite current collector, which comprises a metal substrate layer and a transition metal boride layer at least arranged on one surface of the metal substrate layer. According to the lithium metal negative electrode composite current collector, through the transition metal boride layer, the wettability and the binding force of the negative electrode lithium metal layer and the current collector can be effectively improved; and moreover, atomic-scale lattice matching can be formed with lithium metal, so that lithium metal atoms are guided to be uniformly deposited on the surface of the current collector, lithium dendritic crystal growth is inhibited, and the safety andstability of the battery are effectively improved.

Description

technical field [0001] The application belongs to the technical field of batteries, and in particular relates to a lithium metal negative electrode composite current collector, a preparation method of a lithium metal negative electrode composite current collector, and a lithium ion battery. Background technique [0002] With the development of science and technology and the improvement of people's living standards, there are higher requirements for the battery energy density of portable electronic devices and electric vehicles. At present, the anode materials of commercial lithium-ion batteries generally use graphite materials, and the theoretical capacity is limited (372mAh / g), which is difficult to meet the needs of the development of high-performance lithium-ion batteries. Therefore, the development of new anode materials with high capacity has become an important research direction for lithium-ion batteries. Due to its ultra-high specific capacity (3860mAh / g) and extrem...

Claims

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Application Information

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IPC IPC(8): H01M4/66H01M10/0525
CPCH01M4/661H01M4/667H01M10/0525Y02E60/10
Inventor 蒋春磊郑银银石磊唐永炳
Owner SHENZHEN INST OF ADVANCED TECH
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