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Preparation method of novel lithium ion battery negative electrode material niobium-based oxide

A lithium-ion battery and negative electrode material technology, applied in the direction of niobium compounds, battery electrodes, chemical instruments and methods, etc., can solve the problems of complex process, high synthesis temperature, high equipment requirements, etc., to improve electrochemical performance, increase electrical conductivity, The effect of simplifying the production process

Pending Publication Date: 2021-09-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the liquid phase method and electrospinning method can prepare niobium-based anode materials with various nanostructures and other special shapes with excellent performance, there are problems such as long synthesis time, low production efficiency, complicated process, and high equipment requirements; The material recycling process is easy to pulverize, which leads to poor material processing performance and low battery energy density
Although the high-temperature solid-phase method has a simple process and can prepare micron-sized products, it also has problems such as high synthesis temperature (above 1000 ° C), high energy consumption, difficult control of material morphology, and poor electrochemical performance.

Method used

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  • Preparation method of novel lithium ion battery negative electrode material niobium-based oxide
  • Preparation method of novel lithium ion battery negative electrode material niobium-based oxide
  • Preparation method of novel lithium ion battery negative electrode material niobium-based oxide

Examples

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Effect test

Embodiment 1

[0021] Example 1: Weigh niobium powder, selenium powder, copper powder and tungsten powder according to the stoichiometric ratio, the excess selenium is 6%, and the molar ratio of tungsten and niobium is 1:23.6. Add a certain amount of absolute ethanol, the solid-to-liquid ratio is 0.3:1. The material was heated in a water bath at 35° C. for 4 hours under electromagnetic stirring, and ultrasonically dispersed for 30 minutes. After completion, the material was dried in a blast drying oven. Subsequently, the material was wet-milled for 7 hours, and the ball milling speed was n=350r / min. After the ball milling and dispersion were completed, the ball mill jar was placed in an oven for drying. Then placed in an argon atmosphere and sintered at 700 °C for 5 h to obtain the precursor Cu 2 W 0.05 Nb 0.78 Se 4 material, the heating rate is 10°C / min. Precursor Cu 2 W 0.05 Nb 0.78 Se 4 The material is placed in a glass tube in the air state and calcined at 600 ° C for 6 hours to...

Embodiment 2

[0022] Example 2: Weigh niobium powder, selenium powder, copper powder and molybdenum powder according to the stoichiometric ratio, the selenium excess is 4%, and the molar ratio of molybdenum and niobium is 1:15.6. Add a certain amount of absolute ethanol, and the solid-to-liquid ratio is 0.4:1. The material was heated in a water bath at 35°C for 3 hours under electromagnetic stirring, and ultrasonically dispersed for 35 minutes. After completion, the material was dried in a blast drying oven. Subsequently, the material was wet-milled for 8 hours, and the ball milling speed was n=400r / min. After the ball milling and dispersion were completed, the ball mill jar was placed in an oven for drying. Then placed in an argon atmosphere and sintered at 600 °C for 6 h to obtain the precursor Cu 2 Mo 0.075 Nb 0.77 Se 4 material, the heating rate is 15°C / min. Precursor Cu 2 Mo 0.075 Nb 0.77 Se 4 The material is placed in a glass tube in the air state and calcined at 700 ° C for ...

Embodiment 3

[0023] Example 3: Niobium powder, selenium powder, copper powder and titanyl sulfate were weighed according to the stoichiometric ratio, the excess of selenium was 3%, and the molar ratio of titanium and niobium was 1:7.6. Add a certain amount of absolute ethanol, the solid-to-liquid ratio is 0.3:1. The material was heated in a water bath at 35°C for 5 hours under electromagnetic stirring, and ultrasonically dispersed for 40 minutes. After completion, the material was dried in a blast drying oven. Subsequently, the material was wet-milled for 6 hours, and the ball milling speed was n=500r / min. After the ball milling and dispersion were completed, the ball mill jar was placed in an oven for drying. Then placed in an argon atmosphere and sintered at 800 °C for 4 h to obtain the precursor Cu 2 Ti 0.15 Nb 0.74 Se 4 material, the heating rate is 12°C / min. Will Cu2 Ti 0.15 Nb 0.74 Se 4 The material is placed in a glass tube in the air state and calcined at 500 ° C for 7 hour...

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Abstract

The invention relates to a preparation method of a novel lithium ion battery negative electrode material niobium-based oxide, which belongs to the technical field of lithium ion battery negative electrode materials. The preparation method comprises the following steps of firstly, preparing a precursor Cu2MaNb0.8-0.4aSe4 by adopting a solid phase method, putting the obtained material into an air dry oven for drying, then transferring the material into a ball milling tank, carrying out wet milling treatment in a ball mill, and after ball milling dispersion is completed, putting the ball milling tank into a drying oven for drying, placing the obtained powder in a tubular furnace, sintering under the protection of argon atmosphere, and cooling to room temperature along with the furnace to obtain a precursor, and transferring the obtained precursor material into a crucible, placing the crucible in a glass tube, and carrying out calcination treatment to obtain the porous sheet-shaped lithium ion battery negative electrode material.

Description

technical field [0001] The invention relates to a preparation method of a novel lithium-ion battery negative electrode material niobium-based oxide, belonging to the technical field of lithium-ion battery negative electrode materials. Background technique [0002] Since entering the 21st century, due to the rapid consumption of fossil fuels such as coal and oil, on the one hand, it has caused increasingly serious environmental pollution, and on the other hand, it has aggravated the global energy crisis. Because of this, there is an urgent need for an energy storage and conversion system with high efficiency, low consumption and environmental friendliness. As a typical representative of the new energy field, lithium-ion batteries are widely used in various fields due to their outstanding energy density, good cycle stability, light weight, and low pollution. As one of the key materials of lithium-ion batteries, anode materials have always been a research hotspot in this field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G39/00C01G33/00H01M4/48H01M4/62H01M10/0525
CPCC01G39/006C01G33/006H01M4/483H01M4/626H01M10/0525C01P2002/72C01P2004/03C01P2004/22C01P2006/40Y02E60/10
Inventor 苏安邦刘云建杨海风陆兆平杨泓
Owner JIANGSU UNIV
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