Preparation method for lithium ion battery from electrode material with core-shell structure

A lithium-ion battery, core-shell structure technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of unstable oxide electrodes, poor battery cycle performance, and metal element dissolution, and alleviate the problem of structural damage. , Improve the electrochemical performance, reduce the effect of dissolution

Inactive Publication Date: 2014-12-24
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after decades of research, metal oxide electrode batteries are still difficult to achieve large-scale production applications, mainly due to several key issues that have not yet been resolved.
In the electrode reaction process of the oxide electrode battery, there are problems such as the generation of non-conductive substances during the discharge process, the dissolution of metal elements, and the destruction of the electrode structure due to a large amount of lithium insertion, which directly leads to the instability of the oxide electrode, which in turn leads to poor cycle performance of the battery. Coulombic inefficiency

Method used

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  • Preparation method for lithium ion battery from electrode material with core-shell structure
  • Preparation method for lithium ion battery from electrode material with core-shell structure

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 1) Add 1.86 g of chromium trichloride hexahydrate, 1.16 g of terephthalic acid, and 50 ml of deionized water into a 70 ml hydrothermal kettle; stir for 30 minutes and react at 210°C for 24 hours to obtain the metal-organic framework material MIL Mixture of -101(Cr) and ligand. The mixture was soaked in a 1:1 mixed solution of ethanol and N,N-dimethylformamide to wash, and kept at 80°C for 10 hours. After taking it out, it was washed with ethanol and centrifuged to obtain the metal-organic framework material MIL-101 ( Cr).

[0025] 2) Add 108 ml of deionized water, 240 mg of metal-organic framework material MIL-101(Cr) and 0.996 ml of hydrochloric acid into a 150 ml beaker, stir for 10 minutes, add 12 ml of TALH dropwise and continue stirring for 5 hours to obtain a titanium dioxide package Coated MIL-101(Cr) samples.

[0026] 3) Heat the sample to 350°C for 5 hours in a tube furnace under an argon atmosphere, and obtain a carbonized material after cooling; continue he...

Embodiment 2

[0033] 1) Add 0.276 g of copper nitrate 2.5 hydrate, 0.165 g of trimesic acid, 70 ml of N,N-dimethylformamide, 70 ml of ethanol and 70 ml of deionized water into a 250 ml beaker; stir at room temperature for 10 Minutes later, 0.3 ml of ammonia water with a mass concentration of 28% was added, stirring was continued for 5 hours, and the mixture was centrifuged to obtain the metal-organic framework material HKUST-1.

[0034] 2) Add 10 ml of ethanol, 50 mg of metal-organic framework material HKUST-1 and 200 μl of tetraisopropyl titanate into a 20 ml beaker, and add 1 ml of deionized water dropwise to the beaker while stirring to make titanate Tetraisopropyl ester is hydrolyzed to generate titanium dioxide that uniformly coats the surface of HKUST-1, forming a core-shell structure material.

[0035] 3) The obtained core-shell structure material was calcined at 350°C for 5 hours in an argon atmosphere, and then kept at 350°C in air for 5 hours to obtain a core-shell structure sampl...

Embodiment 3

[0038] 1) Add 0.45 g of cobalt nitrate hexahydrate, 5.5 g of dimethylimidazole and 23 ml of deionized water into a 25 ml beaker, stir at room temperature for 6 hours, wash and centrifuge to obtain metal-organic framework material ZIF-67.

[0039] 2) Add 50 mg of metal-organic framework material ZIF-67 to 5 ml of ethanol and add 500 μl of butyl titanate to obtain solution 1; and disperse 100 μl of water into 5 ml of ethanol to obtain solution 2. Solution 2 was added dropwise to solution 1, and stirred at room temperature for 5 hours to obtain a metal-organic framework material coated with titanium dioxide.

[0040] 3) The titanium dioxide-coated metal-organic framework material was calcined at 250°C for 4 hours in an argon atmosphere, and then heated to 400°C in air for 4 hours to obtain a core-shell structure material of titanium dioxide-coated zinc oxide.

[0041] 4) Mix the obtained core-shell structure sample with porous carbon and polyvinylidene fluoride to make powder, wh...

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Abstract

The invention discloses a preparation method for a lithium ion battery from an electrode material with a core-shell structure. The preparation method comprises the following steps: cladding titanium dioxide on the surface of a metal-organic framework material by using different precursors under different conditions; performing two-step calcining on the metal-organic framework material to form the core-shell structure of oxide cladded by the titanium dioxide; then mixing the core-shell material with a binder and a conductive agent to obtain the electrode material of the lithium ion battery. According to the electrode material of the lithium ion battery, prepared by the preparation method disclosed by the invention, the metal-organic framework material is used as a template; the metal-organic framework material is converted into metal oxide through calcining and a porous structure of the metal-organic framework material is retained; the metal-organic framework material is coated with the titanium dioxide to form the core-shell structure, so that the dissolution of metal elements in the cycle process of the battery is reduced; besides, the problem about structural damage caused by lithium insertion is relieved, so that the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium ion battery electrode material, in particular to a method for preparing a titanium dioxide-coated porous metal oxide core-shell structure lithium ion battery electrode material. Background technique [0002] In the 21st century, with the rapid development of science and technology and economy, people are also facing increasingly serious energy and environmental problems, including the greenhouse effect and energy depletion caused by the massive emission of carbon dioxide. Faced with the above problems, the full use of clean and renewable energy sources (such as solar energy, wind energy, etc.) has become one of the subjects that scientists are committed to research in the 21st century, such as electric vehicles. To make full use of new energy sources, efficient and recyclable energy storage devices are essential. Among many energy storage devices, lithium-ion batteries have been widely valued ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/60H01M4/36
CPCH01M4/366H01M4/483H01M10/0525Y02E60/10
Inventor 钱国栋王步雪王子奇崔元靖杨雨王智宇
Owner ZHEJIANG UNIV
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