Preparation method of nitrogen-doped rutile tio2/c negative electrode material for sodium ion battery

A sodium-ion battery and rutile-type technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of short cycle life and low negative electrode capacity, achieve long cycle life, improve conductivity, and facilitate operation

Active Publication Date: 2018-03-27
深圳市智能兄弟科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composite nanomaterial prepared by this method has excellent electrochemical properties, which solves the problems of low capacity and short cycle life of such materials in the prior art as the negative electrode of sodium ion batteries

Method used

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  • Preparation method of nitrogen-doped rutile tio2/c negative electrode material for sodium ion battery
  • Preparation method of nitrogen-doped rutile tio2/c negative electrode material for sodium ion battery
  • Preparation method of nitrogen-doped rutile tio2/c negative electrode material for sodium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 3.4g of tetrabutyl titanate, 0.8g of melamine and 0.08g of phenolic resin in 60mL of absolute ethanol. After fully stirring, the solution was placed in a planetary ball mill, and ball milled at a speed of 360 r / min for 4 hours. After the ball milling, the solvent was evaporated to dryness to obtain a precursor. The precursors were placed in a tube furnace under Ar / H 2 Under a protective atmosphere, the temperature was raised to 800°C at a heating rate of 10°C / min, and sintered for 6 hours to obtain the target material. Its XRD such as figure 1 as shown in a. It can be seen from the figure that the target material is TiO in rutile phase 2 , the space group is P42 / mnm(136). figure 2 It is a transmission electron microscope picture of the material, and it can be seen that the material is a nano-particle with a small size, and the size of the particle is between 5-50 nm. It is obvious from the TEM image that a layer of carbon is coated around the composite ma...

Embodiment 2

[0034] Dissolve 3.4g of tetrabutyl titanate and 0.2g of phenolic resin in 60ml of ethanol. After fully stirring, the solution was placed in a planetary ball mill, and ball milled at a speed of 360 r / min for 4 hours. After the ball milling, the solvent was evaporated to dryness to obtain a precursor. The precursors were placed in a tube furnace under Ar / H 2 Under a protective atmosphere, the temperature was raised to 800°C at a heating rate of 10°C / min, and sintered for 6 hours to obtain rutile TiO 2 / C Composite. Its XRD such as figure 1 as shown in b. It can be seen from the figure that the target material is TiO in rutile phase 2 , the space group is P42 / mnm(136).

[0035] The pole pieces were prepared according to the method of Example 1 and the batteries were assembled for testing. Figure 4 b records the capacity retention diagram of the battery for the first 50 cycles at a rate of 0.5C. It can be seen from the figure that the second discharge capacity of the batter...

Embodiment 3

[0037] Dissolve 3.4 g of tetrabutyl titanate in 60 mL of ethanol. After fully stirring, the solution was placed in a planetary ball mill, and ball milled at a speed of 360 r / min for 4 hours. After the ball milling, the solvent was evaporated to dryness to obtain a precursor. The precursor was placed in a tube furnace under an Ar protective atmosphere, and the temperature was raised to 800 °C at a heating rate of 10 °C / min, and sintered for 6 h to obtain rutile TiO 2 Material. Its XRD such as figure 1 as shown in c. It can be seen from the figure that the target material is TiO in pure rutile phase 2 , the space group is P42 / mnm(136). Table 2 reports that the carbon content of the material prepared in Example 3 was 0%.

[0038] Tests were carried out after preparing pole pieces and assembling batteries according to the method in Example 1. Figure 4 c records the capacity retention diagram of the battery for the first 50 cycles at a rate of 0.5C. It can be seen from the f...

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Abstract

The invention discloses a preparation method of a nitrogen-doped rutile TiO2 / C negative electrode material for a sodium-ion battery. The preparation method comprises the steps of adding a nitrogen source and a carbon source into a titanium source-containing solution, carrying out ball milling, drying, and then sintering in protective atmosphere to obtain the target material. According to the preparation method, the double doping of the nitrogen element to a TiO2 main body and a carbon cladding layer is realized by one-step heat treatment. The prepared material is nano particles which are taken as the negative electrode of the sodium-ion battery, and has high specific discharge capacity and excellent circulatory stability. According to the preparation method, the process flow is short, the operation is simple, and the industrial production can be realized easily.

Description

technical field [0001] The invention belongs to the technical field of high-energy battery materials, in particular to nitrogen-doped rutile TiO for high-performance sodium-ion batteries 2 The preparation method of / C negative electrode material. Background technique [0002] At present, the storage and conversion of energy has become a severe challenge for human beings. Among the current various technologies, lithium-ion batteries are widely used in portable electronic products due to their advantages such as high working voltage, high capacity, small self-discharge, and long cycle life, and have become the mainstay of electric vehicles (including EV and HEV, etc.) and large-scale storage batteries. An important choice of power supply for energy systems. However, the abundance of lithium resources in the earth's crust is very low. With the rapid development of the scientific and technological information industry and the real arrival of the smart grid era, the global dema...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/583H01M4/48H01M4/139H01M10/36
CPCH01M4/139H01M4/362H01M4/48H01M4/483H01M4/583H01M10/36Y02E60/10
Inventor 王海燕何菡娜唐有根
Owner 深圳市智能兄弟科技有限公司
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