Abstract
Severe volume expansion and inherently poor lithium ion transmission are two major problems of silicon anodes. To address these issues, we proposed a pomegranate-type Si/C composite anode with highly dispersed tiny silicon particles as the core assisted by small amount of SiC. Skillfully exploiting the high heat from magnesiothermic reduction, SiC can assist the good dispersion of silicon and provide good interface compatibility and chemical stability. The silicon anchored to the carbon shell provides multipoint contact mode, that together with the carbon shell frame, significantly promoting the transfer of dual charge. Besides, the pomegranate-type microcluster structure also improves the tap density of the electrode, reduces the direct contact area between active material and electrolyte, and enhances the electrochemical performance.
Highlights
The rapid development of new energy industries forces the exploration of lithium ion batteries (LIBs) into the higher, faster, and safer area
The SiO2 nano-particles synthesized from the hydrolyzation of tetraethyl orthosilicate (TEOS) present regular sphere shape with smooth surface and uniform size (~180 nm) (Fig. S1 in the Electronic Supplementary Material (ESM))
Carbon layer is formed from the normal coating and carbonization of resorcinol formaldehyde (RF) resin
Summary
The rapid development of new energy industries forces the exploration of lithium ion batteries (LIBs) into the higher, faster, and safer area. Liu et al [10] designed a pomegranate-inspired Si/C anode by gathering a number of yolk@shell nano particles to form a microsized particle This novel nano–micro secondary structure deliveries high areal capacity and ultralong cycling life. The small amount SiC, gained from the local high temperature of MR by controlling NaCl, can play a role like double side tape to anchor the Si particles on the C shell with a good dispersion. This design of tape-SiC exhibits three kinds of excellent peculiarities, as follows: 1) Intrinsic chemical inert can protect Si from the corrosion of the permeable electrolyte. The pomegranate-shape-like structure armed with carbon shell can: 1) limit the direct contact of electrolyte and silicon; 2) improve the electronic conductivity of Si nanoparticles; 3) provide hollow void for the free volume expansion of silicon
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