Preparation of silicon carbon anode for lithium-ion batteries by fixed bed and lithium storage properties
Utilizing conductive carbon black as the substrate and SiH4 as the silicon source precursor,silicon-carbon composite anode material were prepared for lithium-ion batteries via a fixed bed CVD reactor.Two schemes were studied:sole deposition of SiH4 and its co-deposition with C2H4.Additionally,the impact of carbon encapsulation using C2H4 as the carbon source on the lithium storage performance was investigated.The experimental results reveal that sole SiH4 deposition yields smaller Si nanoparticles,with a reduction in Si loading as the deposition temperature increases.During the co-deposition of SiH4 and C2H4,C@SiC composite structure is formed,and the crystallinity and grain size of elemental silicon decrease with the increase of C2H4 proportion.Under the co-deposition of SiH4/C2H4 and C2H4 carbon coating conditions,a composite structure featuring coexistent Si,SiC,and C crystals is observed,enhancing sample material cycling performance albeit with a notable decrease in capacity.
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