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

A lithium-ion battery, composite electrode technology, applied in electrode manufacturing, electrode carrier/current collector, negative electrode, etc., can solve the problems of short circuit, easy generation of lithium dendrite volume, swelling battery, etc.

Inactive Publication Date: 2019-03-29
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The inventors of the present invention found in the research process that the negative electrode of lithium metal is prone to produce lithium dendrites during charging and will expand in volume to...

Method used

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

Examples

Experimental program
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Effect test

preparation example Construction

[0060] According to an embodiment of the present invention, refer to figure 2 , the preparation method comprises:

[0061] S100: Provide carbon paper.

[0062] In this step, a carbon paper 110 having a three-dimensional structure is provided as a porous supporting structure of the lithium metal composite electrode 100 . According to the embodiment of the present invention, the method of providing carbon paper 110 is not particularly limited and can be purchased directly, and carbon fibers can also be formed by methods such as molding. Those skilled in the art can choose to provide carbon paper 110 according to the specific size of the lithium metal composite electrode. way, which will not be repeated here.

[0063] S200: soaking the carbon paper in the precursor solution, and then sintering the carbon paper to obtain the lithium-friendly carbon paper.

[0064] In this step, soak the carbon paper in step S100 in the zinc-containing organic solution to fully wet it, and then...

Embodiment 1

[0076] In this example, a lithium metal composite negative electrode was prepared. The specific steps are as follows:

[0077] (1) Preparation of zinc-containing organic solution (Zn-sol): Zinc acetate dihydrate, ethanolamine and n-propanol are used as raw materials, magnetically stirred and heated and dissolved at 40-60°C to obtain clear, transparent and uniform Zn-sol solution;

[0078] (2) Lithophilic treatment of carbon paper: Soak carbon paper (thickness 150 microns, carbon fiber diameter 5-8 microns, porosity 70-75%) in Zn-sol solution, transfer to drum In an air drying oven, dry at 100-120°C for 5-30 minutes to remove excess solvent, then move the carbon paper to a muffle furnace and raise the temperature to 510-550°C at a rate of 5-10°C / min Sintering at high temperature for 10 to 30 minutes to obtain carbon paper with a lithium-friendly surface;

[0079] (3) Heat the lithium sheet in a nickel vessel or a stainless steel vessel to 240-400°C. After the lithium sheet is ...

Embodiment 2

[0084] In this example, the lithium metal composite negative electrode prepared in Example 1 is used to form a Li-CP / / Li-CP symmetric battery, and its liquid electrolyte uses aluminum hexafluorophosphate, and the area current density is 3mA / cm 2 , The area specific capacity is 1mAh / cm 2 Under the conditions of the cycle charge and discharge test.

[0085] The cycle stability test result of the symmetrical battery of this embodiment is as follows Figure 7 As shown, among them, Figure 7 The abscissa of is time (Time, unit is s), and the ordinate is overpotential (Overpotential, unit is V). from Figure 7 It can be seen that the overvoltage in the first 50 cycles is stably maintained below 0.2V, and the overvoltage gradually increases to 0.4V in the 100th cycle.

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Abstract

The invention provides a lithium metal composite electrode, a preparation method thereof and a lithium ion battery. The lithium metal composite electrode includes: a carbon paper, a lithium affinity layer covering the surface of gaps on the carbon paper; and a lithium metal filled in the gaps of the carbon paper. The invention provides a lithium metal composite electrode. The supporting structureis made of multi-gap carbon paper. The surface of the gaps of the carbon paper is coated with the lithium affinity layer, so that the surface lithium affinity performance of the supporting structure can be provided, and the nucleation overpotential of the metal lithium is reduced. The lithium metal can be effectively induced to uniformly nucleate on the carbon paper in the charging and dischargingprocess. Further, the generation of lithium dendrites in the charging and discharging process is reduced. Moreover, lithium metal is uniformly distributed in the gaps of the carbon paper, so that theproblem of volume expansion of the carbon paper in the charge-discharge process can be obviously reduced. The carbon paper with a three-dimensional multi-gap structure has a relatively high specificsurface area, so that the effective contact area of the lithium metal is increased, and the specific capacity of the lithium metal composite electrode is further improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular, the invention relates to a lithium-metal composite electrode, a preparation method thereof, and a lithium-ion battery. Background technique [0002] With the rapid development of electric vehicles and mobile electronic devices, the current society's demand for high-energy-density lithium batteries has become increasingly prominent. Among them, lithium metal, as an ideal anode material, has attracted widespread attention due to its higher theoretical specific capacity (3860mAh / g) and lower potential (-3.04vs. standard hydrogen electrode) than graphite anode. Using metal lithium as the negative electrode material can effectively increase the energy density of the battery, expand the working voltage of the battery, and reduce the energy attenuation of the battery. [0003] However, when lithium metal is used as the negative electrode during charging, lithium ions will d...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/66H01M4/80H01M10/0525H01M4/04H01M4/134H01M4/1395
CPCH01M4/0416H01M4/134H01M4/1395H01M4/382H01M4/626H01M4/663H01M4/801H01M10/0525H01M2004/027Y02E60/10
Inventor 柳在律蔡挺威秦士林赵晓宁克劳迪乌·布库尔·博格丹
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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