Alkali metal-rare earth dissimilar metal framework compound, and preparation method and application thereof

A framework compound and heterometallic technology, which is applied in the field of photoelectric functional materials and crystal materials, can solve the problems of battery electrochemical performance degradation, affecting battery life, and low lithium ion mobility, achieving high ion conductivity and lithium ion migration number effect

Active Publication Date: 2021-08-10
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most MOFs benchmark solid-state electrolytes face two problems: one is that the mobility of lithium ions is too low, and the other is that they cannot suppress the side reactions during the charging and discharging of lithium-ion batteries.
Lithium ion mobility is too low to reduce the electrochemical performance of the battery. During the charging and discharging process, the side reaction products of the battery such as water and hydrogen fluoride have a toxic effect on the positive and negative electrodes of the battery, which reduces the cycle stability of the battery and seriously affects the service life of the battery.

Method used

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  • Alkali metal-rare earth dissimilar metal framework compound, and preparation method and application thereof
  • Alkali metal-rare earth dissimilar metal framework compound, and preparation method and application thereof
  • Alkali metal-rare earth dissimilar metal framework compound, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1: [NH 2 (CH 3 ) 2 ][Eu 3 Li 2 (BTB) 4 ] Preparation of Heterometallic Organic Framework Compounds

[0036] Mix 0.135 mmol europium acetate hydrate, 0.1 mmol 1,3,5-tris(4-carboxyphenyl)benzene and 0.4 mmol lithium hydroxide monohydrate (or 0.1 mmol europium acetate hydrate, 0.12 mmol 1,3,5-tris( 4-carboxyphenyl)benzene and 0.4mmol lithium hydroxide monohydrate) were added to the mixed solution of 4mL N,N-dimethylacetamide and 1mL water and mixed evenly, the resulting mixture was put into a 25mL stainless steel reaction kettle, and put into the oven for hydrothermal reaction. After being incubated at 130°C for 72 hours, it was cooled to room temperature, filtered and centrifuged to obtain [NH 2 (CH 3 ) 2 ][Eu 3 Li 2 (BTB) 4 ] Heterometallic organic framework compounds.

[0037] The resulting compound is subjected to a scanning electron microscope test, and its scanning electron microscope is as follows: figure 1 shown.

[0038] The samples were cha...

Embodiment 2

[0045] Example 2: [NH 2 (CH 3 ) 2 ][Eu 3 Li 2 (TATB) 4 ] Preparation of Heterometallic Organic Framework Compounds

[0046] Mix 0.135mmol europium acetate hydrate, 0.1mmol 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine and 0.4mmol lithium hydroxide monohydrate (or 0.1mmol europium acetate hydrate, 0.12mmol 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine and 0.4 mmol lithium hydroxide monohydrate) were added to 4 mL of N,N-dimethylacetamide, 1 mL of water, and 24 μL of tris The mixed solution of ethylamine was uniformly mixed, and the resulting mixture was put into a 25mL stainless steel reaction kettle, and put into an oven for hydrothermal reaction. After being incubated at 160°C for 36 hours, it was lowered to room temperature, filtered and centrifuged to obtain [NH 2 (CH 3 ) 2 ][Eu 3 Li 2 (TATB) 4 ] Heterometallic organic framework compounds.

[0047] The metal Eu in Example 2 can be completely replaced by Y, Ho, Dy, Er, Tb, Tm, etc. to form completely isomorphic compou...

Embodiment 3

[0048] Example 3: [NH 2 (CH 3 ) 2 ][Y 3 Li 2 (BTB) 4 ] Preparation of Heterometallic Organic Framework Compounds

[0049] Add 0.1 mmol of yttrium acetate hydrate, 0.12 mmol of 1,3,5-tris(4-carboxyphenyl)benzene and 0.4 mmol of lithium hydroxide monohydrate to a mixed solution of 4 mL of N,N-dimethylacetamide and 1 mL of water Mix evenly, put the resulting mixture into a 25mL stainless steel reaction kettle, and put it into an oven for hydrothermal reaction. After being incubated at 120°C for 84 hours, it was lowered to room temperature, filtered and centrifuged to obtain [NH 2 (CH 3 ) 2 ][Y 3 Li 2 (BTB) 4 ] Heterometallic organic framework compounds.

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Abstract

The invention discloses an alkali metal-rare earth dissimilar metal framework compound. The chemical formula of the compound is [NH2(CH3)2](Re3Li2L4), WHEREIN L is a deprotonated ligand, H3L IS 1, 3, 5-tris(4-carboxylphenyl)benzene (H3BTB) or 2, 4, 6-tris(4-carboxylphenyl)-1, 3, 5-triazine (H3TATB), the crystal structure of the compound belongs to an orthorhombic crystal system, the space group is Pcca. In the crystal structure, metal lithium and rare earth metal are connected through carboxyl oxygen to form columnar structures, the columnar structures are connected through the deprotonated ligand L to form a three-dimensional frame structure, and the crystal structure has a hierarchical porous structure. The alkali metal-rare earth dissimilar metal framework compound disclosed by the invention has two different metal centers and a multilevel microporous structure, rare earth elements enable the compound to have a luminescent property, and the compound has three one-dimensional pore channels with different sizes and a large specific surface area, and provides sufficient pore channels for dye adsorption and lithium ion transmission, so the compound has potential application in the fields of luminescent materials and battery materials.

Description

technical field [0001] The invention relates to the field of photoelectric functional materials and crystal materials, in particular to an alkali metal-rare earth heterometal framework compound with a hierarchical pore structure, a preparation method and an application. Background technique [0002] Metal-organic frameworks (MOFs), which have both inorganic and organic characteristics, are considered to be a promising future due to their adjustable porous structure, controllable composition and multifunctionality at the molecular level. Functional materials have great potential application value in many fields, especially luminescent materials and battery materials. Heterometallic organic framework materials are metal organic framework materials composed of two or more metal elements as metal centers and connected by organic ligands. Due to the existence of two or more metal centers, the metals at two close sites in space are combined with the ligands, which may produce dif...

Claims

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Application Information

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IPC IPC(8): C08G83/00H01M10/0565C09K11/06
CPCC08G83/008C09K11/06H01M10/0565H01M2300/0082C09K2211/182Y02E60/10
Inventor 李凌云黄玮昕李新雄于岩杨程凯李鑫昊
Owner FUZHOU UNIVERSITY
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