Lithium-carbon composite material, its preparation method and application, and lithium compensation method
A carbon composite material and compensation method technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of limited increase in electrode specific surface area, high equipment cost, large particle size, etc., and achieve good cycle stability, particle size, etc. The effect of small diameter and uniform particle size
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[0042] In a more typical embodiment, the preparation method specifically comprises: in an inert atmosphere, after uniformly mixing the complex carbon particles and lithium metal, heating until the lithium metal melts, and fully stirring, and then cooling to room temperature to obtain the obtained Lithium-carbon composite materials.
[0043] In the aforementioned preparation method, the protection of the inert atmosphere can prevent the metal lithium from deteriorating (for example, being oxidized) due to contact with air or the like during the heating and melting process.
[0044] In the aforementioned preparation methods, the reaction vessels and the like used should be inert with respect to metallic lithium, that is, the constituent materials of these reaction vessels will not react with metallic lithium in the aforementioned preparation methods.
[0045] Further, the raw materials of the carbon particles include acetylene black, Ketjen black (such as Ketjen black ECP600JD),...
Embodiment 1
[0074] Example 1: Mix lithium metal and acetylene black (purchased from Alfa Aesar) at a mass ratio of 1:1 and add a heater that is inert to lithium metal, heat to about 200°C to melt lithium metal, and stir for 10 minutes , after the stirring was completed, it was cooled to room temperature to obtain lithium-carbon composite nanoparticles, and the lithium loading amount thereof was 38wt% according to a weighing test. The aforementioned operations are preferably performed under argon protection. According to the nitrogen adsorption and desorption test, the lithium-carbon composite nanoparticles have pores of 10 to 70 nm and pores of 0.1 to 1 cm. -3 g -1 Kong Rong.
Embodiment 2
[0075] Embodiment 2: The process of this embodiment is basically the same as that of Embodiment 1, except that the mass ratio of metal lithium to acetylene black used is 1.5:1. However, the lithium loading in the obtained lithium-carbon composite nanoparticles was 47wt%. The X-ray powder diffraction pattern of the lithium-carbon composite nanoparticles can be found in figure 1 shown. refer to Figure 2a , Figure 3a-Figure 3b These are the transmission electron micrographs and scanning electron micrographs of the acetylene black nanoparticles used in this example, respectively, and it can be seen that they have a spherical or quasi-spherical structure.
[0076] Figure 2b , Figure 3c-Figure 3d They are the transmission electron micrographs and scanning electron micrographs of lithium-carbon composite nanoparticles in this example, respectively. It can be seen that they are aggregates formed by spherical or quasi-spherical particles, in which molten lithium exists on the ...
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