Preparation method for papermaking black liquid-transferred porous carbon negative electrode material for sodium ion battery
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A sodium-ion battery and porous carbon material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable environmental protection, and achieve the effects of simple preparation process, low reaction temperature, and good repeatability
Inactive Publication Date: 2017-12-08
SHAANXI UNIV OF SCI & TECH
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[0006] Document 2 "Li Yao, Preparation of porous carbon functional materials based on plant hierarchical structure and research on the performance of lithium-ion battery anodes [D]. Shanghai Jiaotong University, 2015" disclosed a method of preparing porous carbon electrode materials using rice husks as raw materials method, but this method also needs to use strong acid and alkali chemical reagents, which is not conducive to environmental protection
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Embodiment 1
[0024] 1) First, put the papermaking black liquor in an oven and dry it at 50°C for 30 hours;
[0025] 2) Then, place the dried product in a tube furnace, pass through argon as a protective gas, and the argon flow rate is 20ml / min, and heat treatment is performed from room temperature to 600°C at a heating rate of 2°C / min 5h, obtain porous carbon material;
[0026] 3) Finally, the obtained porous carbon material was placed in a muffle furnace for activation treatment at 200° C. for 2 hours, and after cooling, a porous carbon-sodium-ion battery negative electrode material was obtained.
Embodiment 2
[0028] 1) First, dry the papermaking black liquor in an oven at 60°C for 25 hours;
[0029] 2) Then, place the dried product in a tube furnace, pass through argon as a protective gas, and the argon flow rate is 50ml / min, and heat treatment is performed from room temperature to 650°C at a heating rate of 5°C / min 3h, obtain porous carbon material;
[0030] 3) Finally, the obtained porous carbon material was placed in a muffle furnace for activation treatment at 250° C. for 2 h, and after cooling, a porous carbon sodium ion battery negative electrode material was obtained.
Embodiment 3
[0032] 1) First, put the papermaking black liquor in an oven and dry it at 70°C for 20 hours;
[0033] 2) Then, place the dried product in a tube furnace, pass through argon as a protective gas, and the argon flow rate is 50ml / min, and heat treatment is performed from room temperature to 700°C at a heating rate of 5°C / min 2h, obtain porous carbon material;
[0034] 3) Finally, the obtained porous carbon material was placed in a muffle furnace for an activation treatment at 300° C. for 1 h, and after cooling, a porous carbon sodium ion battery negative electrode material was obtained.
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Abstract
Disclosed is a preparation method for a papermaking black liquid-transferred porous carbon negative electrode material for a sodium ion battery. The preparation method comprises the steps of firstly, putting a papermaking black liquid into a drying oven to be dried at a temperature of 50-90 DEG C; next, putting the dried product into a tubular furnace, pumping argon as the protective gas and heating from the room temperature to 600-800 DEG C at the heating rate of 2-10 DEG C/min to perform heat treatment to obtain a porous carbon material; and finally, putting the obtained porous carbon material into a muffle furnace to perform activation treatment at a temperature of 200-350 DEG C, and performing cooling to obtain the porous carbon negative electrode material for the sodium ion battery. According to the preparation method, the papermaking black liquid is used as the raw material, so that the waste which refers to the ''papermaking black liquid'' in the papermaking production process is recycled and reused, wherein lignin and plant fibers and the like are subjected to thermal treatment to be converted into carbon; alkali included in the black liquid can etch the carbon material at a high temperature, so that the obtained product can obtain a three-dimensional porous structure; and next, by combination with activation treatment, the nanometer porous carbon material with the graded structure can be obtained.
Description
technical field [0001] The invention belongs to the field of preparation of negative electrode materials for sodium ion batteries, and in particular relates to a preparation method for the negative electrode materials of porous carbon sodium ion batteries converted from papermaking black liquor. technical background [0002] With the increasing global energy demand, searching for new energy storage devices has become a research hotspot in the field of new energy. Lithium-ion batteries have the characteristics of high specific energy, long cycle life, small size, no memory effect, and no pollution. Power supply and power battery for mobile equipment. However, the scarcity of lithium resources limits the large-scale application of lithium-ion battery technology. Relatively speaking, sodium reserves are higher than lithium, widely distributed, and cheap. The mass of sodium accounts for 2.6% of the mass of the earth's crust. Therefore, research on sodium-ion battery related te...
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