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Gel composite lithium metal electrode and preparation method and application thereof

A metal electrode and composite lithium technology, which is applied in the field of lithium-ion batteries, can solve the problems of gel layer and lithium negative electrode damage, and achieve the effect of simple and easy method, optimization of lithium deposition process, and improvement of lithium deposition cross section

Active Publication Date: 2019-06-04
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(Advanced Materials, 2016, DOI: 10.1002 / adma.201602800; Angewandte Chemie International Edition, 2017, 56, 7505–7509.) However, in this method, NMP will always exist in the gel, and thermodynamically, NMP Reacts with lithium, causing uncontrollable side reactions and causing damage to the gel layer and lithium negative electrode

Method used

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  • Gel composite lithium metal electrode and preparation method and application thereof
  • Gel composite lithium metal electrode and preparation method and application thereof
  • Gel composite lithium metal electrode and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A preparation method of a gel composite lithium metal electrode, the method is as follows:

[0038] (1) Mix PVDF-HFP and ETPTA (containing 0.5wt% HMPP) in a mass ratio of 1:2, and add 1M LiClO that is 3 times the mass of the polymer mixture 4 TEGDME (triethylene glycol dimethyl ether) solution, and add the nanometer SiO of gross mass 5% 2 The powder is mixed and stirred evenly to make a photopolymerization precursor solution.

[0039] (2) Roll the lithium sheet (80μm) onto the copper foil (9μm), roll it to 70μm, cut the lithium sheet and copper foil together to 5*5cm, weld the negative tab on the copper foil, scrape the surface of the lithium sheet Apply the gel precursor solution with a scraping height of 120 μm.

[0040] (3) Set the wavelength of ultraviolet light to 365nm, and irradiate the gel precursor solution for photocuring for 30s, so as to prepare a single-sided gel composite lithium metal electrode.

Embodiment 2

[0042] A preparation method of a gel composite lithium metal electrode, the method is as follows:

[0043] (1) Mix PVDF-HFP and ETPTA (containing 1% HMPP) at a ratio of 1:3, add 0.6M LiTFSI&0.4M LiNO which is 1.5 times the mass of the polymer mixture 3 DOL / DME solution, and add 10% of the total mass of nano-Al 2 o 3 Powder, mix and stir evenly to make photopolymerization precursor solution.

[0044] (2) A layer of copper mesh (10 μm) is sandwiched between two lithium sheets (100 μm), and rolled to form a double-sided lithium sheet electrode. Using the spin coating method, the surface of the lithium wafer was spin-coated with a photopolymerization precursor solution with a thickness of 30 μm.

[0045] (3) Set the wavelength of ultraviolet light to 365nm, and irradiate the gel precursor liquid for photocuring for 20s. Flip the electrode over, apply the same gel precursor solution with a thickness of 30 μm on the other side, and light-cure for 20 seconds.

[0046] (4) Lead o...

Embodiment 3

[0054] Use the gel composite lithium metal electrode prepared in Example 1 as negative electrode, use 1M LiClO 4 The TEGDME solution is used as the electrolyte, and the carbon load is 1mg / cm 2 The Super-P electrode was used as an air electrode, and the assembled Li-O 2 Battery, set 0.1mA / cm 2 , constant volume 2mAh / cm 2 (ie 2000mAh / g) cycle. Such as Figure 7 As shown, the battery is stable for 20 cycles.

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Abstract

The invention relates to a gel composite lithium metal electrode, and a preparation method and an application thereof, which belong to the technical field of lithium ion batteries. The electrode is composed of a current collector, a lithium metal layer and a gel layer arranged on the lithium metal layer, wherein the lithium metal layer is attached to the current collector, and is obtained by pressing a lithium sheet onto the current collector by means of a roller; the gel layer is formed by carrying out in-situ reaction on a polymeric precursor solution coated on the surface of the lithium metal layer by adopting an ultraviolet photopolymerization method, and the polymeric precursor solution is composed of a polymer PVDF-HFP, a photopolymerization agent EPTTA, a photoinitiator HMPP, lithium salt, a metal oxide nano additive and an ether solvent. The invention further discloses the gel composite lithium metal electrode and the application thereof in the preparation of a lithium metal battery. The preparation method of the invention is simple and easy to implement, the prepared gel composite lithium metal electrode can be directly used, and the lithium metal battery can cycle stablyunder high current density and high capacity without producing lithium dendrites; at the same time, the surface of the electrode is electronically insulated, a membrane can be removed when the batteryis assembled, and the energy density of the battery can be effectively increased.

Description

technical field [0001] The invention relates to a gel composite lithium metal electrode and its preparation method and application. The lithium metal electrode is prepared by means of polymer gel coating, and then the electrode is used to prepare a lithium metal battery, which belongs to the technical field of lithium ion batteries. Background technique [0002] After nearly two decades of development, lithium-ion batteries have entered thousands of households due to their high efficiency, convenience, and pollution-free characteristics. However, with portable mobile devices represented by mobile phones and new energy sources represented by electric vehicles With the rapid development of transportation, people have put forward higher and higher requirements for lithium-ion batteries, especially with the deepening of "standby time worries" and "mileage worries", people pay more attention to the energy density of lithium-ion batteries. In this context, the traditional anode ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/38H01M4/60H01M4/04H01M10/0525
CPCY02E60/10
Inventor 孙浩博张立赵尚骞
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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