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Molybdenum oxide material with core-shell structure for negative electrode of lithium ion battery and preparation method thereof

A lithium-ion battery, core-shell structure technology, applied in the direction of battery electrodes, secondary batteries, structural parts, etc., can solve the problem of less electron conduction paths in electrode materials, and achieve insufficient electronic conductance, low cost, and good uniformity Effect

Active Publication Date: 2018-03-20
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Pure mechanical compound, MoO 3 Electron conduction paths are still less in electrode materials

Method used

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  • Molybdenum oxide material with core-shell structure for negative electrode of lithium ion battery and preparation method thereof

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preparation example Construction

[0020] Such as figure 1 shown. A method for preparing a molybdenum oxide material with a core-shell structure for a lithium ion battery negative electrode, comprising the following steps:

[0021] (1) MoO 3 Mix with reduction inducer, stir, and dry at 60°C to obtain powder;

[0022] (2) Heat-treat the powder in a reducing atmosphere at a temperature of 400-800°C for 0.5-3 hours to obtain MoO with a thickness of 1-500nm 2 Shell.

Embodiment 1

[0024] Weigh 5gMoO 3 , add 0.005g polyethylene glycol solution and 10mL ethanol, ethanol is used as solvent, polyethylene glycol is dissolved in ethanol, polyethylene glycol and MoO 3 Evenly dispersed, volatile, easy to stir and dry, stir and dry at 60°C to get powder; put the powder in a tube-type atmosphere furnace, pass N 2 atmosphere, heated to 750°C for 1h to obtain MoO 2 Molybdenum oxide material with a shell thickness of 100nm core-shell structure.

Embodiment 2

[0026] Weigh 5gMoO 3 , add 0.015g polyethylene glycol solution and 10mL ethanol. Stir and dry at 60°C to obtain powder; place the powder in a tube-type atmosphere furnace and pass through H 2 atmosphere, heated to 400°C for 0.5h to obtain MoO 2 Molybdenum oxide material with a shell thickness of 1nm core-shell structure.

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Abstract

The invention discloses a molybdenum oxide material of a core-shell structure for a negative electrode of a lithium ion battery and a preparation method of the molybdenum oxide material. The molybdenum oxide material consists of a MoO3 core and a MoO2 shell covering the surface of the core. By adopting a gas-phase heat treatment reduction method, the MoO3 shell to be covered is mixed with a reduction inducer, after an atmosphere is introduced, the heat treatment is carried out, and MoO3 on the surface layer of the MoO3 core is reduced to a uniform MoO2 layer. The preparation method of the core-shell structure is simple, the requirement on the morphology of the core structure is low, the shell structure is controllable in thickness, complete and homogenous, and the molybdenum oxide material is applicable to the negative electrode material of the lithium ion battery, capable of reducing the electron conduction and polarization and capable of improving the energy density of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a molybdenum oxide material with a core-shell structure for negative electrodes of lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in the fields of consumer electronics and power batteries due to their high energy density, high voltage platform, long cycle life, and environmental friendliness. The current commercial lithium-ion battery system is mainly graphite-based carbon anode materials, but its theoretical specific capacity is only 372mAh / g, and the development of new anode materials has become a top priority. [0003] MoO, two oxides of molybdenum 3 and MoO 2 It can be used as anode material for lithium-ion batteries. MoO 3 It has a high theoretical specific capacity (1117mAh / g), but in actual use, due to poor electronic conductivity, the actual specific capacity will b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G39/02H01M4/36H01M4/48H01M10/0525
CPCC01G39/02C01P2004/61C01P2004/62C01P2004/64H01M4/366H01M4/48H01M10/0525Y02E60/10
Inventor 陈龙李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY