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A deionized water and carbon electrode technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of electrolyte decomposition and first-efficiency reduction, and achieve good film-forming properties, increased utilization rate, and excellent sodium storage capacity and the effect of rate performance
Pending Publication Date: 2021-12-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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However, the nanoscale and porous structure will inevitably introduce more defects, resulting in continuous decomposition of the electrolyte, resulting in a decrease in the first effect
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Embodiment 1
[0037] Step (1): Weigh 4g of polyacrylonitrile (PAN), dissolve it in 36g of N,N-dimethylformamide (DMF) at room temperature, and keep stirring for 8h until it is completely dissolved.
[0038] Step (2): Add 8 g of polyvinylpyrrolidone (PVP) to the above liquid, and continue to stir for 4 hours until completely dissolved.
[0039] Step (3): Put the above liquid in an oil bath, stir and react at 80° C. for 9 hours until the sol-gel is complete.
[0040] Step (4): The glue solution is evenly dripped onto a PTFE mesh mold with a size of 40mm×40mm×1.5mm.
[0041] Step (5): The PTFE mold with the gel film was immersed in deionized water at 70° C. for phase separation, and this step was repeated until the deionized water was no longer turbid.
[0042] Step (6): Carbonize the porous polymer film obtained by removing the mold from (5) in a tube furnace, control the heating rate at 3°C / min until the carbonization temperature is 1200°C and keep for 2h.
[0043] Step (7): further pulver...
Embodiment 2-4
[0047] The PVP addition amount in step (2) of embodiment 1 is changed into 0g, 4g and 12g respectively, thereby carried out embodiment 2-4 successively, other are all unchanged.
[0048] Table 1 shows the specific surface area and performance of the sodium-ion battery of the hard carbon materials prepared in Examples 1-4.
[0049] Table 1
[0050]
[0051]
Embodiment 5-9
[0053] The PAN in the step (1) of embodiment 1 is changed into polyvinyl butyral (PVB), polyvinyl alcohol (PVA), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE) successively, other are unchanged.
[0054] Table 2 shows the specific surface area and performance of the sodium ion battery of the hard carbon materials prepared in Examples 5-9.
[0055] Table 2
[0056]
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Abstract
The invention provides an ordered porous hard carbon for a sodium ion battery. The preparation method of the ordered porous hard carbon for the sodium ion battery comprises the following steps: sequentially dissolving a polymer precursor and a phase separation accelerant in an organic solvent to form a mixed solution; heating the mixed solution in an oil bath and stirring to form a sol solution; uniformly dripping the sol solution on the surface of a mold to form a gel film; immersing the mold with the gel film formed on the surface in deionized water for phase separation; separating the obtained porous membrane from the mold and drying; and carbonizing the dried porous membrane in a protective atmosphere to form hard carbon. A sol-gel film is formed by selecting a phase separation accelerant with proper polarity and a specific precursor, ordered pore-forming can be quickly performed on the film through simple washing phase separation, and the carbonized material is similar to natural wood and has a large number of vertical and ordered macroporous channels, so that the material has a good application prospect. Therefore, the wettability and quick transmission of the electrolyte can be improved.
Description
technical field [0001] The invention relates to an electrode material of a sodium ion battery. Background technique [0002] As an energy storage device, battery technology has become an indispensable part of national life. From small portable instruments to large electric vehicles and military energy equipment, batteries are inseparable. Lithium-ion batteries are currently the most widely used secondary batteries, and they occupy an important position in both scientific research and industrialization. However, due to factors such as uneven distribution of lithium resources in the world, limited reserves, and high production costs, it is difficult to meet the needs of sustainable development. Therefore, it is necessary to develop new electrochemical energy storage technologies to replace lithium-ion batteries. In the post-lithium-ion battery technology, sodium-ion batteries are feasible to replace lithium batteries due to the rich sodium resources and balanced global distri...
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