Method for in-situ construction of surface coating layer based on metal-organic framework material

A framework material and surface coating technology, which is applied in the field of in-situ construction of surface coating layers on different substrates based on metal-organic framework materials, which can solve the problem of poor uniformity and continuity of coating thickness and the inability to accurately control coating thickness To achieve the effect of improving reaction kinetics, reducing surface film resistance and charge transfer resistance, and inhibiting dissolution

Pending Publication Date: 2021-02-23
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, this method has disadvantages—the thickness uniformity and continuity of the cladding layer are poor, and the thickness of the cladding layer cannot be precisely controlled

Method used

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  • Method for in-situ construction of surface coating layer based on metal-organic framework material
  • Method for in-situ construction of surface coating layer based on metal-organic framework material
  • Method for in-situ construction of surface coating layer based on metal-organic framework material

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[0055] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0056] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0057] The present invention will be further elaborated below through specific implementation cases. Among them, the addition amount of organic complexing agent and solvent can be adjusted according to the actual situation, so as to realize the con...

Embodiment 1

[0060] 1. Preparation of Al-MOF structure-coated silica spheres (SiO 2 )

[0061] 100mg SiO 2 Beads, 166mg of aluminum sulfate octadecahydrate, and 75mg of isophthalic acid were dispersed in 15ml of N,N-dimethylformamide solution and 5ml of absolute ethanol solution, and dispersed evenly by ultrasonication; reflux reaction at 80°C for 24h, centrifuged, After washing and drying, the silica with a core-shell structure coated based on the Al-MOF structure can be obtained.

[0062] 2. Structural and Morphological Characterization of Processed Materials

[0063] The Al-MOF structure-coated silica prepared in the above scheme has a typical core-shell structure, and its transmission electron microscope shows figure 1 shown. The core material is silica pellets with an average particle size of 414nm, the shell material is an Al-MOF structure with a thickness of 30nm, and the Al-MOF is evenly distributed on the surface of the silica.

Embodiment 2

[0065] 1. Preparation of Al-MOF structure-coated tin dioxide pellets (SnO 2 )

[0066] 100mg SnO 2 Beads (average particle size is 50nm), 166mg of aluminum sulfate octadecahydrate, 75mg of isophthalic acid are dispersed in 15ml of N,N-dimethylformamide solution and 5ml of absolute ethanol solution, ultrasonically and dispersed uniformly; at 80 ℃ reflux reaction for 24 hours, after centrifugation, washing and drying, the tin dioxide with core-shell structure coated based on Al-MOF structure can be obtained.

[0067] 2. Structural and Morphological Characterization of Processed Materials

[0068] The tin dioxide coated with Al-MOF structure prepared in the above scheme has a typical core-shell structure, and its transmission electron microscope shows figure 2 shown. The core material is tin dioxide pellets with an average particle size of 50nm, the shell material is an Al-MOF structure with a thickness of 15nm, and the Al-MOF is evenly distributed on the surface of the tin ...

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Abstract

The invention provides a method for in-situ construction of a surface coating layer based on a metal-organic network framework material, which promotes in-situ growth of nanoparticles on the surface of a core structure by regulating and controlling the dynamic process, namely nucleation and growth, of a metal organic network framework structure so as to achieve the purpose of constructing a uniform coating layer on the surface of a core. By adopting the method provided by the invention, a coating layer based on a metal organic network framework material can be constructed on the surface of a conventional positive electrode material, and the prepared positive electrode material can effectively inhibit the side reaction between the electrode material and an electrolyte, slow down the generation of surface SEI, reduce the surface film impedance and charge transfer impedance, and improve the reaction kinetic process of lithium ions; meanwhile, dissolution of transition metal ions can be inhibited, collapse of a lattice structure in the circulation process of the electrode material is effectively relieved, and the circulation stability and the rate capability of the positive electrode material are remarkably improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrode materials, and relates to a method for constructing surface coating layers in situ on different substrates based on metal-organic framework materials. Background technique [0002] The replacement speed of portable electronic devices, transportation methods and power grids has put forward higher requirements for the technical development of batteries. High energy density and long cycle life are the development direction of lithium-ion batteries. High specific capacity and high working voltage are effective measures to improve energy density. Therefore, the design and development of high specific capacity and high voltage electrode materials is the focus of battery material researchers. [0003] The development of high specific energy battery materials is accompanied by a series of problems such as structural stability and safety, so we need to design new materials that meet the charac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 曹安民高敬迟万立骏
Owner INST OF CHEM CHINESE ACAD OF SCI
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