Core-shell structure of nano silicon energy storage material and lithium ion battery comprising nano silicon energy storage material
A technology of energy storage materials and core-shell structure, which is applied in the direction of batteries, nanotechnology, structural parts, etc., can solve the problems of limited capacity improvement, lithium ion consumption, accelerated capacity, etc., and achieve good stretch recovery, buffer volume shrinkage changes, The effect of prolonging the service life
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Embodiment 1
[0045] Embodiment 1 (the structure of following embodiment 2~6 is identical, repeats no more):
[0046] Such as figure 1 Shown: a core-shell structure of a nano-silicon energy storage material, including an inner core, an organic-inorganic intermediate layer coated on the outside of the inner core, and an outer shell coated on the outside of the intermediate layer. The inner core is composed of A particles 1 Composition, the middle layer is B skeleton structure 2 containing Si—O—Si cross-linked network;
[0047] Such as figure 2 Shown: the A particle 1 and the B skeleton structure 2 form an AB composite particle.
[0048] Such as image 3 Shown: the shell 3 is covered with one AB composite particle.
[0049] Such as Figure 4 Shown: the shell 3 is covered with a plurality of AB composite particles.
[0050] Further, after high-temperature sintering, the skeleton structure 2 of the middle layer B forms annular voids, and the voids are filled with nano-silicon 21 .
[00...
Embodiment 2
[0056] The preparation method of embodiment 2:
[0057] Using silicon as the inner core, it is firstly hydrolyzed with difunctional organosiloxane, then polymerized and coated with the inner core, then polymerized and coated with trifunctional organosiloxane, and then coated with the outer carbon layer, and sintered for later use.
[0058] Step 1. Select 100 parts of silicon particles with a D50 particle size of 150nm and 2 parts of siloxane coupling agent γ-glycidyl ether propyl trimethoxysilane KH560, and disperse them in ethylene glycol by ultrasonic after mechanical mixing. Ultrasonic at 40°C for 2 hours to carry out surface grafting treatment, filter and dry for later use;
[0059] Step 2. Add 15 parts of dimethyldimethoxysilane to 100 parts of aqueous solution and hydrolyze at 30°C for 0.5 hours. Add 8 parts of the product from Step 1 as a nucleating substance and disperse evenly. Raise the temperature to 50°C. Under the neutral condition of 7, carry out the polymerizat...
Embodiment 3
[0061] The preparation method of embodiment 3:
[0062] With silicon as the inner core, difunctional organosiloxane is first used as a chain extender, copolymerized with trifunctional and tetrafunctional groups, polymerized and coated with the inner core, and then coated with the outer carbon layer, and sintered for later use.
[0063] Step 1. Select 100 parts of silicon particles with a D50 particle size of 500nm and 2 parts of siloxane coupling agent γ-(methacryloyloxy)propyltrimethoxysilane KH570, and after mechanical mixing, ultrasonically disperse in anhydrous In ethanol, supersonicate at 50°C for 0.5 hours to carry out surface grafting treatment, filter and dry for later use;
[0064] Step 2. Add 5 parts of dimethyldiethoxysilane, 10 parts of cyclohexyltrimethoxy, and 3 parts of ethyl orthosilicate to 100 parts of aqueous solution at 30°C for 0.5 hours to hydrolyze 15 parts of the product of step 1 Add as a nucleating substance to disperse evenly, raise the temperature ...
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