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Electrode materials for lithium-ion batteries and their applications in lithium-ion batteries

A technology for lithium-ion batteries and electrode materials, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as structural damage and MOFs material structure damage, and achieve good discharge specific capacity and excellent structural stability , The effect of high discharge specific capacity

Active Publication Date: 2017-09-29
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, metal-organic framework materials such as MOF-5 and MOF-177 are exposed to air for a period of time, and the structure will be destroyed.
On the other hand, during the charging and discharging process of electrochemical batteries, such as lithium-ion batteries, due to the donation of electrons, this may also cause the metal organic framework material to undergo a reduction reaction, resulting in the destruction of the MOFs material structure.
However, exposure to air is unavoidable when preparing electrodes for electrochemical cells, such as Li-ion batteries

Method used

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  • Electrode materials for lithium-ion batteries and their applications in lithium-ion batteries
  • Electrode materials for lithium-ion batteries and their applications in lithium-ion batteries
  • Electrode materials for lithium-ion batteries and their applications in lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this example, a half-cell was used to test the lithium storage performance of the electrode material. A half-cell is mainly composed of a positive electrode, a negative electrode, a separator, and an electrolyte.

[0034] Negative pole lithium sheet;

[0035] The cathode is a mixed material, composed of ZIF-4, Super-p, PVDF;

[0036] The diaphragm is Celgard 2400;

[0037] The electrolyte in the electrolyte is 1mol / L lithium hexafluorophosphate (LiPF 6 ), the solvent is a mixed solvent of FEC (fluoroethylene carbonate): DMC (dimethyl carbonate): EMC (methyl ethyl carbonate) with a volume ratio of 1:1:1.

[0038] Wherein, the preparation of ZIF-4 is as follows:

[0039] 0.9g Zn(NO 3 )·6H 2 O, 0.63g C 3 h 4 N 2 (Imidazole) was dissolved in 40ml of N,N-dimethylformamide, stirred evenly, and then transferred into a polytetrafluoro reactor for solvothermal reaction, the reaction temperature was 130°C, and the reaction time was 3 days. After the reaction, cool do...

Embodiment 2

[0048] In this example, the structure of the lithium-ion battery is basically the same as that of Example 1, except that the mixed material is composed of ZIF-62, Super-p, and PVDF.

[0049] Wherein, the preparation of ZIF-62 is as follows:

[0050] 3.0g Zn(NO 3 )·6H 2 O, 1.4g C 3 h 4 N 2 (imidazole) and 1.18g C 7 h 6 N 2 (benzimidazole) was dissolved in 200ml of N,N-dimethylformamide, stirred evenly, and then transferred into a polytetrafluoro reactor for solvothermal reaction, the reaction temperature was 130°C, and the reaction time was 3 days. After the reaction, cool down to room temperature naturally, open the reaction kettle, pour off the solvent and collect the white crystal of ZIF-62. Soak the ZIF-62 crystal in N.,N dimethylformamide for 1 day, then pour off the N,N dimethylformamide solvent, and use methanol solvent to soak the ZIF-62 crystal for 1 day, pour off the methanol solvent, and put it at room temperature After natural drying at 220°C for 24 hours i...

Embodiment 3

[0057] In this example, the structure of the half-cell is basically the same as that of Example 1, except that the negative electrode is a mixed material, which is composed of amino ZIF-62, Super-p, and PVDF.

[0058] The framework of the amino ZIF-62 contains metal Zn 2+ ions, as well as imidazole and aminobenzimidazole, are amino-functionalized ZIF-type metal-organic framework porous materials.

[0059] The preparation method of above-mentioned amino ZIF-62 is as follows:

[0060] The precursor containing imidazole and aminobenzimidazole is C 7 h 7 N 3 with C 3 h 4 N 2 ;

[0061] Contains Zn 2+ The soluble salt of zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O);

[0062] The organic solvent is N,N-dimethylformamide (DMF);

[0063] Measure 15ml of DMF in a polytetrafluoroethylene high-temperature reaction kettle, and sequentially weigh 0.133g of organic compound C 7 h 7 N 3 , 0.246g C 7 h 7 N 3 With 0.3g zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 0), pou...

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Abstract

The invention provides a lithium ion battery electrode material. The electrode material comprises a metal-organic framework, and the metal-organic framework includes at least one diazole and at least one metal ion. Experiments confirm that the above lithium ion battery electrode has good charge and discharge cycle stability, and after multi-time cycle, the metal-organic framework still has a good structure, and the discharge specific capacity of the battery tends to stability, maintains at a high valve and has a small change amplitude, so the lithium ion battery electrode material is an electrode material with a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an electrode material containing a metal organic framework of a lithium ion battery, its application in a lithium ion battery, and a lithium ion battery using the electrode material. Background technique [0002] Metal-organic frameworks (Metal-Organic Frameworks, referred to as MOFs) is an inorganic material with a network skeleton formed by the coordination of metals and organic ligands. Its main characteristics are high specific surface and pore volume. and adjustable aperture. At present, the research on MOFs materials mainly focuses on the fields of gas adsorption separation or storage, catalyst carrier, drug carrier and magnetism, among which the gas adsorption separation or storage performance of MOFs materials is the most widely studied. [0003] MOFs materials are expected to be used as electrode materials for lithium-ion batteries due to their...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/60H01M10/0525
CPCH01M4/13H01M4/60H01M10/0525Y02E60/10
Inventor 陈亮沈彩林贻超赵冲冲张秋菊孔春龙
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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