Double-phase interface protected metal zinc negative electrode and preparation method and application thereof

A phase interface and metal zinc technology, applied in active material electrodes, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of reducing battery reversible capacity and Coulombic efficiency, short circuit of positive and negative materials, and potential safety hazards. Achieve the effects of improving long-cycle performance, reducing consumption, and avoiding the coating process

Pending Publication Date: 2022-05-27
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
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Problems solved by technology

However, the deposition / dissolution process of zinc ions during cyclic charge-discharge often forms a large number of zinc dendrites.
However, the continuous growth of zinc dendrites will cause direct contact between the positive and negative materials and cause a short circuit, which poses a safety hazard.
A series of problems such as slow corrosion, passivation and hydrogen evolution of the zinc negative electrode also greatly reduce the reversible capacity and Coulombic efficiency of the battery

Method used

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  • Double-phase interface protected metal zinc negative electrode and preparation method and application thereof
  • Double-phase interface protected metal zinc negative electrode and preparation method and application thereof
  • Double-phase interface protected metal zinc negative electrode and preparation method and application thereof

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preparation example Construction

[0045]The invention provides a method for preparing a metal zinc negative electrode protected by a dual-phase interface. The method of treating the zinc negative electrode with a metal fluoride solution directly generates an artificial dual-phase interface on the surface of the zinc negative electrode, which is used as a negative electrode material for an aqueous zinc ion battery; The interface is made of ZnF 2 It is composed of elemental metal, and the specific steps are as follows:

[0046] S1, configure metal fluoride solution;

[0047] Dissolving metal fluoride in an organic solvent to obtain metal fluoride solutions of different concentrations;

[0048] Metal Fluoride as MF x is SnF 2 , FeF 3 , SbF 3 or PbF 2 , different metal fluorides have similar trends, and the thickness of the protective layer increases correspondingly with the increase of metal fluoride solution concentration.

[0049] The organic solvent is isopropanol, dimethyl sulfoxide, diethyl ether or m...

Embodiment 1

[0061] (1) 15mmol SnF 2 Add and dissolve in 5mL dimethyl sulfoxide to obtain SnF with a concentration of 30mM 2 solution;

[0062] (2) Place the polished and cleaned zinc flakes in the above solution, and let stand for 30min at 60°C;

[0063] (3) The treated zinc flakes are cleaned with ethanol and then dried under vacuum for 10 h to obtain a zinc anode with dual-phase interface protection.

[0064] figure 1 The SEM image of the surface of the zinc negative electrode protected by the dual-phase interface obtained in this example shows that the surface of the zinc negative electrode after treatment presents a sheet-like stacking structure. It is speculated that this structure can prevent the zinc negative electrode from directly contacting the electrolyte and causing zinc Side reactions such as chip corrosion and hydrogen evolution.

[0065] figure 2 The XRD pattern of the zinc negative electrode surface protected by the dual-phase interface obtained in this example is sh...

Embodiment 2

[0072] (1) 10mmol SnF 2 Add and dissolve in 5 mL of ether to obtain SnF with a concentration of 20 mM 2 solution;

[0073] (2) Place the polished and cleaned zinc flakes in the above solution, and let stand for 20min at 40°C;

[0074] (3) The treated zinc flakes were cleaned with isopropanol and then dried under vacuum for 8 h to obtain a zinc anode with dual-phase interface protection.

[0075] The zinc anode obtained in this example was characterized by XRD, SEM, etc., and the existence of the dual-phase interface was confirmed, and it was assembled into a symmetrical battery at 1 mA cm -2 stable cycling for more than 580 h at high current density, assembled into Zn||V 2 O 5 Full battery at 1A g -1 It was cycled for 360 cycles at the same current density, and the cycle stability was 43%.

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Abstract

The invention discloses a double-phase interface protected metal zinc negative electrode and a preparation method and application thereof.A zinc sheet is placed in a metal fluoride solution through a simple and rapid treatment method to form an artificial double-phase interface of ZnF2 and a metal simple substance, and uniform nucleation and efficient deposition of zinc ions are promoted through the metal simple substance in the double-phase interface, so that the metal zinc negative electrode is obtained. And meanwhile, the ZnF2 protective layer reduces side reactions of polarization and hydrogen evolution corrosion, successfully inhibits growth of zinc dendrites, improves the interface stability between the zinc negative electrode and the electrolyte, and remarkably improves the electrochemical performance of the zinc ion battery.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and in particular relates to a metal zinc negative electrode with dual-phase interface protection and a preparation method and application thereof. Background technique [0002] With the progress of society, people's demand for energy is increasing day by day, and higher requirements are put forward for the efficient use of energy, safety and environmental protection. Lithium-ion batteries currently dominate the market, but the scarcity and high cost of lithium metal, as well as the flammability and toxicity of organic electrolytes, greatly limit the application and development of lithium-ion batteries. As a new type of green and environmentally friendly battery, aqueous zinc-ion battery has broad development prospects and application value due to the advantages of high-power charging and discharging, high energy density, low cost, simple preparation and high safety. [0003] Metal zinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M10/38
CPCH01M10/38H01M4/02Y02E60/10Y02P70/50
Inventor 韩晓刚徐晨亮王鹏飞李金鸿
Owner XI AN JIAOTONG UNIV
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