MoO2-MoS2 negative electrode material of sodium-ion battery with core-shell structure and preparation method of MoO2-MoS2 negative electrode material

A sodium-ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve problems such as poor cycle stability, capacity fading, poor conductivity, etc., and achieve high repeatability, large yield, and cycle time short effect

Inactive Publication Date: 2017-02-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flake MoS 2 The layers are connected to each other by van der Waals force, which easily causes the structure to collapse during the intercalation / desodiumation process, resulting in the aggregation of active materials and large volume changes. As the cycle number of sodium-ion batteries increases, the capacity also declines significantly.
At the same time, due to the flake MoS 2 Due to the superposition of charge and discharge and poor conductivity, it shows poor cycle stability when used as anode material for sodium ion batteries.

Method used

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  • MoO2-MoS2 negative electrode material of sodium-ion battery with core-shell structure and preparation method of MoO2-MoS2 negative electrode material
  • MoO2-MoS2 negative electrode material of sodium-ion battery with core-shell structure and preparation method of MoO2-MoS2 negative electrode material
  • MoO2-MoS2 negative electrode material of sodium-ion battery with core-shell structure and preparation method of MoO2-MoS2 negative electrode material

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preparation example Construction

[0024] A core-shell structure MoO disclosed by the invention 2 -MoS 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0025]Step 1. Take ammonium molybdate, grind it evenly, raise the temperature from room temperature to 400-600°C for 1-3 hours, then cool to room temperature, wash and dry the reaction product to obtain MoO 3 Precursor;

[0026] Step 2. Put MoO 3 Precursor and S powder according to the mass ratio of 0.5: (1.0 ~ 5.0), after uniform grinding, under inert conditions, from room temperature to 400 ~ 600 ℃, heat preservation reaction 0.5 ~ 2h, and then continue to heat up to 600 ~ 800 ℃, Insulate and react for 0.5 to 2 hours, cool to room temperature, wash and dry the reaction product to obtain MoO with a core-shell structure 2 -MoS 2 Sodium ion battery anode material.

[0027] Since the sublimation of sulfur powder in the reaction process exists in the form of gas and reflects the environment, ...

Embodiment 1

[0032] A kind of core-shell structure MoO 2 -MoS 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0033] 1. Precursor MoO 3 preparation of

[0034] 1) Take ammonium molybdate, put it into a mortar and grind it thoroughly. The ground sample was placed in a porcelain boat and heated in a tube furnace at 5°C min -1 The heating rate was increased to 400 °C, and after 1 hour of heat preservation, MoO was obtained by high-temperature cracking under air atmosphere conditions. 3 ;

[0035] 2) Cool to room temperature after the reaction, wash the product 3 times with deionized water, and dry it in vacuum for 8 hours to obtain pure phase MoO 3 Precursor.

[0036] 2. MoO 2 -MoS 2 preparation of

[0037] 1) Take the precursor MoO 3 and S powder m(MoO 3 :S)=0.5:1.0 ratio, make it mix evenly by grinding, place the sample after grinding in the porcelain boat, react under the argon atmosphere condition of tubular ...

Embodiment 2

[0045] A kind of core-shell structure MoO 2 -MoS 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0046] 1. Precursor MoO 3 preparation of

[0047] 1) Take ammonium molybdate, put it into a mortar and grind it thoroughly. The ground sample was placed in a porcelain boat and heated in a tube furnace at 6°C min -1 The heating rate was increased to 400°C, and after 1.5h of heat preservation, the high-temperature pyrolysis under air atmosphere conditions gave MoO 3 ;

[0048] 2) Cool to room temperature after the reaction, wash the product 4 times with deionized water, and dry it in vacuum for 9 hours to obtain pure phase MoO 3 Precursor.

[0049] 2. MoO 2 -MoS 2 preparation of

[0050] 1) Take the precursor MoO 3 and S powder m(MoO 3 :S)=0.5:2.0 ratio, make it mix uniformly by grinding, place the sample after grinding in a porcelain boat, and react under the argon atmosphere condition of the tubular a...

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Abstract

The invention discloses a MoO2-MoS2 negative electrode material of a sodium-ion battery with a core-shell structure and a preparation method of the MoO2-MoS2 negative electrode material, and belongs to the technical field of preparation of sodium-ion battery electrode materials. The preparation method comprises the following steps: adopting MoO3 as a precursor to carry out oxidation-reduction reaction with S powder and obtain MoO2, adopting an in-situ synthesis method to grow MoS2 nanosheets on an MoO2 template, and forming an MoO2-MoS2 composite material with the core-shell structure. An MoO2 skeleton plays a role in structure support, so that the superimposition of sheet-shaped MoS2 is avoided, the conductivity of the material is improved, and the cyclic stability of the material is also improved. The preparation process is simple and easy to control, the period is short, the energy consumption is low, the repeatability of products is high, the yield is large, and the benefit for large-scale production is achieved. The MoO2-MoS2 negative electrode material prepared by the method has a three-dimensional core-shell structure and also has the characteristics of high specific-discharge capacity, good cyclic stability and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials for sodium ion batteries, and relates to a core-shell structure MoO 2 -MoS 2 Negative electrode material for sodium ion battery and preparation method thereof, in particular to a kind of MoO with core-shell structure prepared by in-situ synthesis method 2 -MoS 2 A method for high-performance anode materials for sodium-ion batteries. Background technique [0002] With people's widespread attention to clean energy and renewable resources, lithium-ion batteries have been widely used as working power sources for various electronic products (mobile phones, laptops, digital cameras, etc.) and power batteries for mobile equipment (electric vehicles, submarines, missile launches, etc.). However, the scarcity of lithium resources limits the large-scale application of lithium-ion battery technology. Relatively speaking, sodium reserves are higher than lithium and widely distr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/52H01M4/58H01M10/054B82Y30/00
CPCB82Y30/00H01M4/366H01M4/52H01M4/5815H01M10/054Y02E60/10
Inventor 许占位王天姚恺黄剑锋杨军沈学涛曹丽云徐鹏飞
Owner SHAANXI UNIV OF SCI & TECH
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