Halim, Martin Hudaya, Chairul Kim, A-Young Lee, Joong Kee 2024-01-20T05:02:58Z 2024-01-20T05:02:58Z 2021-09-03 2016-02 2050-7488 https://pubs.kist.re.kr/handle/201004/124482 Silicon oxycarbide (SiOC) is gaining increasing attention as a promising anode material for lithium ion batteries due to its higher reversible capacity compared to incumbent graphite. The kinetic processes at a SiOC anode result in rapid capacity fading even at a relatively low current density, thereby hindering its commercialization. Herein, a distinctive, phenyl-rich silicone oil is used as a precursor for producing SiOC anode materials via simple pyrolysis. We find that only silicone oil with phenyl-rich rings can be converted into SiOC materials. The phenyl group was crucial for carbon incorporation to allow Si-O-C bonding and the formation of a free-carbon phase. The resulting SiOC anode exhibited stable cyclability up to 250 cycles, with a discharge capacity of 800 mA h g(-1) at a current density of 200 mA g(-1). The remarkable cycle performance of SiOC was correlated with its low dimensional expansion (7%) during lithiation, which maintains its structure over cycling. Rate capability tests showed a highly stable performance with a maximum discharge capacity of 852 mA h g(-1) at a current density of 100 mA g(-1). When the discharge current density was increased 64-fold, the reversible capacity of the SiOC anode was 90% of its maximum capacity, 772 mA h g(-1). The excellent electrochemical performance of SiOC could be attributed to the rapid mobility of Li+ within the SiOC matrix, as indicated by a Li+ diffusion coefficient of 5.1 x 10(-6) cm(2) s(-1). English ROYAL SOC CHEMISTRY REDUCED GRAPHENE OXIDE POLYMER-DERIVED SICN OXYCARBIDE GLASSES CARBON INSERTION CERAMICS STORAGE INSERTION/EXTRACTION TEMPERATURE CAPABILITY Phenyl-rich silicone oil as a precursor for SiOC anode materials for long-cycle and high-rate lithium ion batteries Article 10.1039/c5ta09973k 1 JOURNAL OF MATERIALS CHEMISTRY A, v.4, no.7, pp.2651 - 2656 JOURNAL OF MATERIALS CHEMISTRY A 4 7 2651 2656 scie scopus 000369665800031 2-s2.0-84958041069 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article REDUCED GRAPHENE OXIDE POLYMER-DERIVED SICN OXYCARBIDE GLASSES CARBON INSERTION CERAMICS STORAGE INSERTION/EXTRACTION TEMPERATURE CAPABILITY Phenyl-rich silicon oil SiOC anode Lithium ion batteries