Three-dimensional flexible metal negative electrode and preparation method thereof

A metal anode, three-dimensional flexible technology, applied in electrode manufacturing, battery electrodes, electrode current collector coating, etc., can solve the problem of metal dendrite growth and lack of affinity from the root cause, and avoid unevenness. The existence of nuclei, good flexibility, and the effect of high Coulomb efficiency

Active Publication Date: 2020-07-10
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

In recent years, scientific researchers have put a lot of energy into proposing a series of improvement strategies, among which the construction of three-dimensional current collectors is considered to be an effective way, the research team of Guo Yuguo (Angew.Chem.Int.Ed. .2019, 58, 1094) reported an Al-coated Lithophilic 3D Cu@Al current collector, which achieved uniform deposition of metallic Li and controlled the serious Li dendrite growth problem to a certain extent; University of Science and Technology Beijing Fan Lizhen's research team (Energy Storage Mater.2018, 15, 274) reported a three-dimensional porous CuNWs@Cu current collector, which achieved controllable deposition of metallic sodium and effectively inhibited the growth of sodium dendrites; Liang Shuquan's research team at Central South University ( Chem.Eng.J.2020,379,122248) reported a three-dimensional copper foam current collector, which can effectively regulate the growth of zinc dendrites to a certain extent; However, the substrates used are all rigid structures, and the overall structure has no affinity for metal lithium, sodium and zinc, so the growth of metal dendrites cannot be solved from the root.

Method used

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  • Three-dimensional flexible metal negative electrode and preparation method thereof
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  • Three-dimensional flexible metal negative electrode and preparation method thereof

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preparation example Construction

[0025] Such as figure 1 As shown, a method for preparing a three-dimensional flexible metal negative electrode, the main steps are as follows:

[0026] Step 1, first configure the metal nanowire ink, select a sponge of a certain size, then immerse the sponge in a certain volume of metal nanowire ink, squeeze it repeatedly for 10 seconds, take it out and place it in an oven for drying;

[0027] In step 2, the three-dimensional flexible current collector is used as the positive electrode, and the metal lithium, sodium or zinc is used as the negative electrode to assemble the button half-cell, and then the metal lithium, sodium or zinc is deposited by electrodeposition; wherein, when the metal is lithium or sodium, the Assemble the button half-cell under an inert atmosphere to avoid metal oxidation. When the metal is zinc, it can be in the air;

[0028] From top to bottom, the button battery includes a negative electrode shell, a metal negative electrode, a separator, a positive...

Embodiment 1

[0037] The concrete steps of preparation are:

[0038] Step 1, first configure the silver nanowire ink with a concentration of 0.03mol / L, prepare a melamine sponge with a diameter of 8mm and a thickness of 0.8mm, then immerse the melamine sponge in 200μL of silver nanowire ink, squeeze it repeatedly for 10 seconds, and take it out Placed in an oven at 55°C for drying treatment, the obtained figure 2 The three-dimensional flexible current collector shown, from Figures (a) to (d), it can be seen that the silver nanowires are evenly attached to the melamine sponge skeleton, and the three-dimensional flexible current collector has a porous structure;

[0039] Step 2, the obtained three-dimensional flexible current collector or copper foil is used as the positive electrode, and lithium metal is used as the negative electrode. Under the condition of argon atmosphere, assemble a 2032 button half battery, and the electrolyte is 1mol / L lithium bistrifluoromethanesulfonylimide 1,3-dioxo...

Embodiment 2

[0042] The concrete steps of preparation are:

[0043] Step 1, first configure the silver nanowire ink with a concentration of 0.06mol / L, prepare a melamine sponge with a diameter of 9mm and a thickness of 1.4mm, then immerse the melamine sponge in 360μL of silver nanowire ink, squeeze it repeatedly for 10 seconds, and take it out Dry in an oven at 60°C. made as figure 1 The three-dimensional flexible current collector shown;

[0044] In step 2, the obtained three-dimensional flexible current collector or pure copper foil is used as the positive electrode, and sodium metal is used as the negative electrode. Under an argon atmosphere, assemble a 2032 button half-cell, and the electrolyte is 1mol / L sodium trifluoromethanesulfonate Diethylene glycol dimethyl ether solution. The obtained button cell was tested for its electrochemical performance with a blue electrochemical test system, and the test conditions were: the current density was 1mAcm -2 , with a circulating surface ...

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Abstract

The invention belongs to the field of metal secondary batteries, and discloses a three-dimensional flexible metal negative electrode and a preparation method thereof. The method comprises the following steps: (a) preparing metal nanowire ink, selecting sponge, soaking the sponge in the metal nanowire ink until the sponge is saturated, taking out the sponge, and performing drying to obtain a three-dimensional flexible current collector; (b) selecting a metal negative electrode, taking the three-dimensional flexible current collector as a positive electrode, and assembling the button half-cell by utilizing the positive electrode and the metal negative electrode; (c) carrying out electro-deposition on the button half-cell to enable the metal negative electrode to be deposited on the three-dimensional flexible current collector, and disassembling the button half-cell to obtain the three-dimensional flexible current collector with the metal negative electrode deposited on the surface, namely the required three-dimensional flexible metal negative electrode. The invention also discloses a product prepared by the method. According to the invention, the metal nucleation overpotential is reduced, and the stress generated in the electrodeposition process is absorbed and released, so the problem of dendritic crystal growth in the metal negative electrode is solved.

Description

technical field [0001] The invention belongs to the field of metal secondary batteries, and more specifically relates to a three-dimensional flexible metal negative electrode and a preparation method thereof. Background technique [0002] With the rapid development of human society and modern technology, the excessive demand for traditional fossil energy (coal, oil and natural gas) has led to a large amount of resource consumption and poor living environment. Therefore, the development of efficient new clean energy and energy storage technology has become It is becoming more and more urgent. Among them, the secondary battery has very important research significance as a high-efficiency energy storage technology. Metal lithium, sodium and zinc are considered to be the next generation of high-power, high-energy-density secondary batteries due to their high theoretical specific capacity. Anode materials with great development potential in secondary batteries. [0003] Although...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/36H01M4/66H01M4/70
CPCH01M4/0404H01M4/362H01M4/666H01M4/70Y02E60/10
Inventor 李真
Owner HUAZHONG UNIV OF SCI & TECH
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