Gueon, Donghee Lee, Jaehyun Lee, Joong Kee Moon, Jun Hyuk 2024-01-20T04:33:14Z 2024-01-20T04:33:14Z 2021-09-03 2016-04 2046-2069 https://pubs.kist.re.kr/handle/201004/124260 The uniform dispersion of Si materials in a carbon matrix while maintaining the nanomorphology of Si is required to achieve higher performance lithium-ion batteries (LIBs). Carbon-coated silicon nanoparticles embedded in monodisperse carbon spheres (C-SNP/CSs) were assembled by a simple mixing approach. We obtained high silicon contents up to 56 wt% for the composite electrodes. The C-SNP/CS anodes delivered a reversible specific capacity of 1230 mAh g (1) for 56 wt% Si and 953 mA h g (1) for 44 wt% Si at 800 mA g (1) after 150 charge/discharge cycles. The capacity retention after 150 cycles was 73% for the 56 wt% Si and 86% for 44 wt% Si C-SNP/CS electrodes, while the bare C-SNPs without CSs displayed only 32% retention. The high cycle performance indicates that the CSs effectively alleviated the mechanical stress induced by the large volume changes of Si during the charge/discharge cycles. Moreover, the high capacity retention reveals the high electrical conductivity of the electrodes, provided by the assembled morphology the CSs and the carbon-shell on the silicon nanoparticles(SNPs). The use of CSs with C-SNPs is a facile method to obtain a uniformly-dispersed mixture and can be readily scaled for practical applications. English ROYAL SOC CHEMISTRY ANODE MATERIAL HIGH-CAPACITY CYCLING PERFORMANCE POROUS SILICON COMPOSITE SI Carbon-coated silicon nanoparticle-embedded carbon sphere assembly electrodes with enhanced performance for lithium-ion batteries Article 10.1039/c6ra00238b 1 RSC ADVANCES, v.6, no.44, pp.38012 - 38017 RSC ADVANCES 6 44 38012 38017 scie scopus 000374495400065 2-s2.0-84966270960 Chemistry, Multidisciplinary Chemistry Article ANODE MATERIAL HIGH-CAPACITY CYCLING PERFORMANCE POROUS SILICON COMPOSITE SI Carbon coated silicon nanoparticle lithium ion batteries assembly carbon sphere