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Preparation method of non-closed multi-walled carbon nanotube material and electrode and battery prepared therefrom
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A multi-walled carbon nanotube, non-closed technology, applied in the direction of multi-walled carbon nanotubes, carbon nanotubes, nano-carbon, etc., can solve the problems that hinder the development of aluminum batteries, short cycle life, low capacity retention, etc., and achieve excellent Cycling stability, increasing storage capacity, and improving specific capacity
Active Publication Date: 2022-06-07
XIFENG 2D FUJIAN MATERIAL TECH CO LTD
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Although metal sulfide cathodes usually have high initial capacity, their short cycle life and low capacity retention hinder the further development of aluminum batteries
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[0031] refer to figure 1 , a method for preparing a non-closed multi-walled carbon nanotube material, the non-closed multi-walled carbon nanotube material is synthesized by a mechanochemical method, and the method includes the following steps:
[0032] S01, potassium permanganate is dissolved in the oleum to obtain a mixed solution;
[0033] S02, immersing the multi-walled carbon nanotubes in the mixed solution and stirring continuously for 30-90min to obtain a mixture, the weight ratio of the potassium permanganate / multi-walled carbon nanotubes is 0.1-4;
[0034] S03, under gentle stirring, slowly pour the mixture into ice water;
[0035] S04, the sample is vacuum filtered with a polyvinylidene chloride filter in a filtration flask under positive pressure to obtain a sample, and the pore size of the polyvinylidene chloride is 0.3-0.8um;
[0036] S05, the obtained sample is repeatedly washed with deionized water;
[0037] S06, after the washed sample is freeze-dried for 12-24...
Embodiment
[0043] refer to figure 1 , a method for preparing a non-closed multi-walled carbon nanotube material, the non-closed multi-walled carbon nanotube material is synthesized by a mechanochemical method, and the method includes the following steps:
[0044] S01, potassium permanganate is dissolved in 20ml oleum to obtain a mixed solution;
[0045] S02, immerse the multi-walled carbon nanotubes whose mass ratio of potassium permanganate: multi-walled carbon nanotubes is 2 into the mixed solution, and continue to stir for 40min;
[0046] S03, under gentle stirring, slowly pour the mixture into ice water;
[0047] S04, the sample is vacuum filtered with a polyvinylidene chloride filter with a pore size of 0.4um in a filter flask under positive pressure to obtain a sample;
[0048] S05, the obtained sample is repeatedly washed with deionized water;
[0049] S06, after the washed sample is freeze-dried for 15h, the sample is collected from the filter paper;
[0050] S07, the sample ...
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Abstract
The invention discloses a method for preparing a non-closed multi-walled carbon nanotube material and an electrode and a battery prepared therefor. The preparation method is as follows: dissolving potassium permanganate into oleum to obtain a mixed solution; mixing the multi-walled carbon nanotube Immerse in the mixed solution and keep stirring to obtain the mixture; slowly pour the mixture into ice water under gentle stirring; vacuum filter the polyvinylidene chloride filter in the filter flask under positive pressure to obtain the sample; the sample is deionized Repeated washing with water; freeze-drying the washed sample and collecting the sample from the filter paper; heating the sample to 800-1000°C in a mixed atmosphere of argon and hydrogen, and keeping it warm for 2-5 hours to obtain non-closed multi-walled carbon nanotubes Material. The present invention is prepared by a top-down chemical mechanical stripping method, and the distance between the outer graphite layers of the multi-walled carbon nanotubes is increased, the storage capacity of the multi-walled carbon nanotubes for anions is increased, and the specific capacity and cycle life of the aluminum ion battery are effectively improved. , and the preparation method is simple and the production cost is low.
Description
technical field [0001] The present invention relates to the technical field of aluminum ion batteries, in particular to a method for preparing non-closed multi-wall carbon nanotube materials and electrodes and batteries prepared therefrom. Background technique [0002] Low cost, high power, and high energy density will be a must for future battery applications, such as Li-S, Li-air, and multivalent ion rechargeable batteries. Multivalent ion rechargeable batteries can provide double the (Mg 2+ , Ca 2+ ) or triple (Al 3+ ) of electrons. More importantly, multivalent ion batteries do not rely on lithium metal, such as Li-S and Li-air batteries, which avoids potential safety risks. In addition, the price advantage of polyvalent metal ore is more favorable for future commercial applications than lithium ore. As the most abundant metal in the Earth's crust, aluminum is ideal for large-scale energy storage due to its stable valence state and low potential. As we all know, Al...
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