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Ion pre-embedded two-dimensional layered material intercalation electrode and preparation method and application thereof

A two-dimensional layered, ionic technology, used in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as low cycle performance and low capacity, achieve high power density, improve structure and interface, and optimize structure and interface. Effect

Active Publication Date: 2019-01-15
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of low capacity and low cycle performance caused by the limitation of inner layer spacing and stability of two-dimensional layered electrode materials in the prior art, the present invention provides an intercalation electrode constructed of ion pre-embedded two-dimensional layered materials Its preparation method and application, the ions are periodically intercalated and detached from the two-dimensional layered material by an electrochemical method, and the ion transport channel is opened in advance. In addition, the pre-embedded ions are anchored between the two-dimensional material layers, which can support the two-dimensional layer Shaped materials provide stable ion channels for the insertion and extraction of electrolyte ions in two-dimensional materials, thereby improving the ion transport capacity of electrode materials and constructing high-performance intercalation electrodes.

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  • Ion pre-embedded two-dimensional layered material intercalation electrode and preparation method and application thereof
  • Ion pre-embedded two-dimensional layered material intercalation electrode and preparation method and application thereof

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preparation example Construction

[0033] The invention provides a preparation method for constructing a high-performance intercalation electrode by pre-embedding two-dimensional layered materials with electrochemical ions. The method comprises the following steps:

[0034] (1) Preparation of two-dimensional layered material working electrode:

[0035] First, the two-dimensional layered material, conductive agent and binder are mixed evenly according to a certain ratio, and N-methylpyrrolidone (NMP) is added for stirring to form a fluid electrode slurry, and then the electrode slurry is evenly coated Made on the current collector, weigh the mass of the coated electrode active material and dry it in vacuum; in addition, some two-dimensional materials can realize the construction of self-supporting electrodes, which can be directly used as working electrodes for electrochemical ion pre-embedding;

[0036] (2) Selection of ion pre-intercalation electrochemical reaction system:

[0037] The ion pre-intercalation e...

Embodiment 1

[0051] A method for constructing a high-performance intercalation electrode by pre-embedding two-dimensional layered materials with electrochemical ions, specifically comprising the following steps:

[0052] (1) Preparation of MXene electrodes

[0053] The two-dimensional layered active material MXene, the conductive agent Super-P, and the binder polyvinylidene fluoride PVDF were ground in a mass ratio of 8:1:1 to make them uniform. The mass of MXene was 80 mg, and the mass ratio of the conductive agent Super-P was The mass is 10 mg, the mass of the binder polyvinylidene fluoride PVDF is 10 mg, and N-methylpyrrolidone (NMP) is added for stirring, and the ratio of the volume of N-methylpyrrolidone (NMP) to the mass of the active substance is 200ml / g , stirred for more than 24 hours to form a fluid electrode slurry, and then evenly brush the electrode slurry on the carbon paper current collector with a brush, and after drying, use the mass of the coated electrode active material...

Embodiment 2

[0066] A preparation method for constructing a high-performance intercalation electrode by ion electrochemical pre-embedded two-dimensional layered material, specifically comprising the following steps:

[0067] (1) Preparation of MXene electrodes

[0068]The two-dimensional layered active material MXene, the conductive agent Super-P, and the binder polyvinylidene fluoride PVDF were ground in a mass ratio of 8:1.5:1.5 to make them uniform. The mass of MXene was 160 mg, and the mass ratio of the conductive agent Super-P was The mass is 30 mg, the mass of the binder polyvinylidene fluoride PVDF is 30 mg, and N-methylpyrrolidone (NMP) is added for stirring, and the ratio of the volume of N-methylpyrrolidone (NMP) to the mass of the active substance is 200ml / g , stirred for more than 26 hours to form a fluid electrode slurry, and then evenly brush the electrode slurry on the current collector of the Ti sheet with a brush. Weigh and then place in a vacuum oven at 60°C for vacuum d...

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Abstract

The invention discloses an intercalation electrode constructed by pre-embedding ions into two-dimensional layered material and a preparation method and application thereof, belonging to the technicalfield of electrode material preparation for electrochemical energy storage devices. Firstly, the electrochemical ion pre-intercalation reaction system was constructed by using two-dimensional layeredmaterial as working electrode, solution containing pre-intercalated ions as electrolyte and high conductive material as counter electrode. The working electrode is applied with fluctuating potentials(cyclic voltammetry and galvanostatic charging and discharging techniques) in a specific voltage window by means of an electrochemical workstation, which forces ions to periodically intercalate between layers of two-dimensional layered materials in order to pre-open the ion transport channel. By controlling the final state potential, the pre-embedded ions are anchored between the inner layers of the two-dimensional material to achieve ion support, so as to construct a high-speed and stable ion transport channel, thereby enhancing the electrode function of the two-dimensional layered material and serving for the high-performance energy storage system.

Description

technical field [0001] The invention relates to the technical field of preparation of electrode materials for energy storage systems, in particular to an intercalation electrode constructed of ion pre-embedded two-dimensional layered materials and its preparation method and application. Background technique [0002] In the design of electrochemical energy storage and conversion systems, the intrinsic physical and chemical properties of electrode materials determine the energy conversion and storage mechanism, electrochemical performance (such as voltage, capacity, rate performance, cycle stability, safety performance, temperature resistance, etc.) Receptivity, etc.). Due to its unique organ-like microstructure, two-dimensional layered materials have nanoscale layered spaces, which can effectively prevent the diffusion and migration of electrolyte ions through the lattice, and promote the storage and storage of ions, electrons, and charges. Therefore, it is widely used in th...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/139H01M4/13H01M10/0525H01M10/054
CPCH01M4/0459H01M4/13H01M4/139H01M10/0525H01M10/054Y02E60/10
Inventor 张炳森李浩杰鲁铭韩文娟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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