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Mxene-coated composite electrode material and preparation method therefor

A composite electrode and electrode material technology, applied in battery electrodes, nanotechnology for materials and surface science, circuits, etc., can solve the problems affecting the performance of electrode materials, damage of electrode materials, severe direct contact reaction, etc., and reduce the dissolution rate. and self-discharge effects, reducing voids, and enhancing conductivity

Active Publication Date: 2018-02-16
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these electrode materials have the following problems in use: (1) low conductivity and surface activity; (2) direct contact with the electrolyte reacts violently, and the electrode material is dissolved in the electrolyte to destroy the electrode material; (3) ) The electrolyte and the electrode material react on the solid-liquid level to form a passivation film. Due to the complex composition of the film layer, poor structure and electrochemical stability, and the self-discharge phenomenon of the electrode material is easy to occur, which seriously affects the electrode. Material properties

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  • Mxene-coated composite electrode material and preparation method therefor

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preparation example Construction

[0036] Disclosed in one embodiment of the present invention is a kind of preparation method of the composite electrode material of Mxene coating, described method comprises the steps:

[0037] (1) Add the electrode material into the solvent, stir evenly, then add Mxene, and stir to obtain a uniform mixed solution.

[0038] (2) The resulting mixed solution is sprayed and granulated by a spray dryer to obtain Mxene-coated electrode material powder.

[0039] (3) The obtained composite electrode material powder is sintered under the protection of an inert gas and then cooled.

[0040] The solvent in the preparation method step (1) of the present invention is water, ethanol, dimethyl sulfoxide, benzene, toluene, xylene, pentane, hexane, cyclohexane, cyclohexanone, tolylcyclohexanone, One or a mixture of two or more of chlorobenzene, dichlorobenzene, dichloromethane, methanol, ethanol, isopropanol, acetone, ethylene glycol, acetonitrile, pyridine, and phenol.

[0041] The electrod...

Embodiment 1

[0046] (1) Will Li 4 Ti 5 o 12 Weigh 100g of the powder and add it into 200ml dimethyl sulfoxide, stir magnetically for 3h, and mix evenly.

[0047] (2) Add 5 g of Mxene accounting for 5% of the mass of the lithium titanate powder to the obtained mixed liquid, stir it magnetically for 5 h, and mix uniformly.

[0048] (3) The obtained mixed solution is sprayed and granulated by a spray dryer to obtain Mxene uniformly coated lithium titanate powder. The spray drying parameters are set as, the inlet temperature is 250°C, and the outlet temperature is 90°C.

[0049] (4) Put the obtained powder into a crucible, put it in a tubular electric furnace, evacuate, and pass nitrogen, repeat the process of evacuating and nitrogen 3 times, and heat at 300°C for 2 hours to obtain the Mxene-coated lithium titanate negative electrode material.

Embodiment 2

[0051] (1) Will Li 4 Ti 5 o 12 Weigh 100g of the powder and add it into 200ml dimethyl sulfoxide, stir magnetically for 3h, and mix evenly.

[0052] (2) Add 1 g of Mxene accounting for 1% of the mass of the lithium titanate powder to the obtained mixed liquid, stir magnetically for 5 hours, and mix uniformly.

[0053] (3) The obtained mixed solution is sprayed and granulated by a spray dryer to obtain Mxene uniformly coated lithium titanate powder. The spray drying parameters are set as, the inlet temperature is 250°C, and the outlet temperature is 90°C.

[0054] (4) Put the obtained powder into a crucible, put it in a tubular electric furnace, evacuate, and pass nitrogen, repeat the process of evacuating and nitrogen 3 times, and heat at 300°C for 2 hours to obtain the Mxene-coated lithium titanate negative electrode material.

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Abstract

The invention provides an Mxene-coated composite electrode material and a preparation method therefor. The preparation method comprises the following steps of (1) adding an electrode material into a solvent to be stirred uniformly, and then adding Mxene to be stirred to obtain a uniform mixed solution; (2) performing spraying granulation on the obtained mixed solution by a spray dryer to obtain Mxene-coated electrode material powder; and (3) performing sintering on the obtained composite electrode material powder under inert gas protection, and then performing cooling. By adoption of the spraydrying method to enable Mxene to coat the electrode material, and by virtue of Mxene, contact between an electrolyte and the electrode material can be blocked, and ion dissolving in the electrolyte and a self-discharge effect can be lowered; in addition, the Mxene is uniformly distributed among the electrode material particles, so that gaps among the electrode material particles can be reduced and the conductivity of the electrode material can be reinforced; and the method is simple in operation, low in cost and the production efficiency can be improved.

Description

technical field [0001] The invention relates to the field of chemical batteries, in particular to a Mxene-coated electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new generation of green high-energy battery. It has the advantages of high working voltage, light weight, high volume specific energy, and no environmental pollution. It is an ideal chemical power source for modern communications, IT and portable electronic products, and is also the preferred choice for future electric vehicles. The power supply has broad application prospects and huge economic benefits. [0003] In the composition of lithium-ion batteries, electrode materials are important factors that determine their safety performance, electrochemical performance and future development direction. In the current commercialized lithium-ion batteries, lithium cobaltate, lithium nickelate, lithium manganate, ternary materials, etc. are mainly used as positiv...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 冯金奎安永灵
Owner SHANDONG UNIV
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