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Asphalt-based negative electrode material for sodium ion battery and preparation method and application thereof

A technology of sodium ion battery and negative electrode material, applied in electrode manufacturing, battery electrode, chemical electrode manufacturing, etc., can solve the problems of low sodium storage capacity and unfavorable sodium ion storage, and achieve good safety performance, high reversible capacity and energy density , the effect of high carbon production rate

Inactive Publication Date: 2019-01-04
INST OF PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the high-temperature carbonization process, pitch is easily graphitized to form a highly ordered carbon layer structure, which is not conducive to the storage of sodium ions, resulting in a low sodium storage capacity of about 90mAh / g.

Method used

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  • Asphalt-based negative electrode material for sodium ion battery and preparation method and application thereof
  • Asphalt-based negative electrode material for sodium ion battery and preparation method and application thereof
  • Asphalt-based negative electrode material for sodium ion battery and preparation method and application thereof

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preparation example Construction

[0042] figure 1 The preparation method of the pitch-based sodium ion battery negative electrode material that the embodiment of the present invention provides, its steps are as follows figure 1 shown, including:

[0043] Step 110, putting the pitch precursor into a muffle furnace for pre-oxidation at 200°C-350°C for 2-6 hours to obtain pre-oxidized pitch;

[0044] Specifically, there may be multiple preferred combinations of the controlling conditions of the pitch pre-oxidation temperature, the pre-oxidation time in this temperature range, and the composition of the pre-oxidation atmosphere.

[0045] For example, pre-oxidation can be carried out in air or oxygen atmosphere. The pre-oxidation temperature preferably ranges from 280°C to 320°C, more preferably 300°C.

[0046] Specifically, the asphalt may be one or more mixtures of coal tar pitch, petroleum asphalt and natural asphalt.

[0047] Step 120, put the pre-oxidized pitch into a high-temperature carbonization furnace...

Embodiment 2

[0055] This example provides the negative electrode material for a sodium ion battery prepared in Example 1 above.

[0056] By controlling the pre-oxidation temperature, pre-oxidation time, pre-oxidation atmosphere and high-temperature carbonization of the pre-oxidized pitch under an inert atmosphere, the ordered structure of the pitch is broken, and an anode material with an irregular block shape is prepared. Irregular bulk amorphous carbon materials prepared by pitch preoxidation and carbonization process, size between 0.5-3 microns, d 002 The value is between 0.36-0.39nm, the Lc value is between 0.9-1.2nm, and the La value is between 3-5nm. image 3 The thermogravimetric curve and differential scanning calorimetry curve of asphalt raw materials held at 300°C for 6 hours in a mixed atmosphere of oxygen and argon are given. It can be seen that the quality of asphalt increases significantly when the pre-oxidation temperature is higher than 200°C. Accompanied by a large amount...

Embodiment 3

[0060] Weigh 2g of asphalt raw material, put it into a magnetic boat and put it in a muffle furnace, raise the temperature to 300°C at a rate of 3°C / min, and keep it warm for 3 hours to obtain pre-oxidized asphalt, the mass percentage of which is 103.9%. Medium asphalt has gained weight. Figure 5 It is the XRD pattern of preoxidized asphalt. Grind the pre-oxidized asphalt and put it into a magnetic boat and put it into a tube furnace, pass in argon as a protective gas, then raise the temperature to 1400°C at a rate of 3°C / min, and keep it warm for 2 hours; then cool naturally to room temperature, and take out the material , the final amorphous carbon material was obtained, and the carbon yield was 67.4%. The XRD spectrum of the amorphous carbon material obtained by carbonizing pitch is shown in Figure 6 . The d of the material can be obtained from the XRD pattern 002 = 0.362nm, L c = 1.161nm. Its Raman spectrum see Figure 7 , the L of the amorphous carbon material ca...

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Abstract

The embodiment of the invention relates to an asphalt-based negative electrode material for a sodium ion battery and a preparation method and application thereof. The method comprises the following steps: putting an asphalt precursor into a muffle furnace at 200 DEG C to 350 DEG C for preoxidation for 2 to 6 hours to obtain preoxidized asphalt; putting the preoxidized asphalt into a high-temperature carbonization furnace, and the temperature of the preoxidized asphalt rising to 1300 DEG C to 1600 DEG C at a heating rate of 0.5 DEG C / min to 5 DEG C / min, performing heat treatment on the preoxidized asphalt in an inert atmosphere for 1 to 10 hours to cause carbonization and cracking reaction of that preoxidized asphalt; wherein oxygen in the preoxidized asphalt is used for breaking the ordered structure of the asphalt in the carbonization process of the preoxidized asphalt to form a disordered structure with wedge-shaped cracks, and the carbon yield is improved and the cost is further reduced; and cooling is performed to reach room temperature to obtain an irregular lumpy amorphous carbon material, that is the negative electrode material for the sodium ion battery.

Description

technical field [0001] The invention relates to the technical field of new energy storage devices, in particular to a pitch-based sodium ion battery negative electrode material and a preparation method and application thereof. Background technique [0002] As the most efficient and convenient energy storage and conversion device, high-performance secondary batteries are crucial to establishing a clean energy system and realizing large-scale energy storage. Na-ion batteries are considered to be a beneficial supplement to lithium-ion batteries due to their advantages of abundant resources, wide distribution and low cost, and are one of the ideal devices for large-scale energy storage. The research and development of sodium-ion battery technology has important strategic significance, and in recent years has once again received extensive attention from various research groups around the world. [0003] The development of high-performance electrode materials is crucial to realiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/133H01M10/054
CPCH01M4/133H01M4/583H01M10/054H01M4/587Y02E60/10H01M2004/027H01M4/0471H01M4/1393H01M4/049H01M4/0404H01M4/0442
Inventor 陆雅翔胡勇胜唐堃李泓黄学杰陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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