Mesocarbon microbeads (MCMB) is one of the promising carbon materials as anodes for rechargeable lithium batteries among commercially available carbon materials. We have examined the correlation between carbon structures and chargedischarge characteristics of the MCMBs prepared at different heat‐treatment temperatures. It was found that the MCMB heat‐treated at 700°C possesses a tremendously high charge‐discharge capacity of 750 Ah kg−1 . This suggests that there is another mechanism for the charge‐discharge reaction besides a graphite intercalation compound mechanism which is well known. Therefore, we propose a cavity mechanism in which intercrystallite spaces in MCMB are capable of storing lithium species.

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ABSTRACT:The mechanical properties and morphological changes of poly(lactic acid) (PLA), polycarbonate (PC), and poly(butylene adipate-co-terephthalate) (PBAT) polymer blends were investigated. Several types of blend samples were prepared by reactive processing (RP) with a twinscrew extruder using dicumyl peroxide (DCP) as a radical initiator. Dynamic mechanical analyses (DMA) of binary polymer blends of PC/PBAT indicated that each component was miscible over a wide range of PC/PBAT mixing ratios. DMA of PLA/PBAT/PC ternary blends revealed that PBAT is miscible with PC even in the case of ternary blend system and the miscibility of PLA and PBAT can also be modified through RP. As a result, the tensile strain and impact strength of the ternary blends was increased considerably through RP, especially for PLA/PBAT/PC ¼ 42/18/40 (wt/ wt/wt) with DCP (0.3 phr). Scanning electron microscopy (SEM) analysis of the PLA/PBAT/PC blends revealed many small spherical island phases with a domain size of approximately 0.05-1 lm for RP, whereas it was approximately 10 lm without RP.

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