A silicone‐based radical polymer 2 was synthesized by hydrosilylation of PMHS with 4‐allyl‐2,2,6,6‐tetramethylpiperidine‐N‐oxyl ether 1 in the presence of a platinum‐ or rhodium‐catalyst. A reversible redox peak of 2 at 3.56 V (vs. Li/Li+) was observed by CV measurements. A coin‐shaped cell of 2 shows a discharge capacity of 46 mAh · g−1, which is 47% of the theoretical capacity of 2 (98 mAh · g−1). A directly TEMPO‐substituted silicone, poly[methyl(2,2,6,6‐tetramethylpiperidine‐N‐oxyl‐4‐oxyl)siloxane] 3 was also obtained by rhodium‐catalyzed dehydrogenative alcoholysis of PMHS with TEMPO‐OH. The coin‐shaped cell of 3 shows a discharge capacity of 80 mAh · g−1, which is 69% of the theoretical capacity of 3 (116 mAh · g−1).magnified image
We fabricated a lithium ion battery with a non-flammable trimethyl phosphate (TMP) electrolyte, which has sufficient cycle properties (capacity retention was 97% at 50 cycles) and safety improvement due to the optimization of lithium salt concentration and a graphite anode with pre-formed solid electrolyte interphase (SEI). By dissolving highly concentrated LiPF 6 , i.e., above 2 M, into the TMP mixed electrolyte, lithium ion easily intercalated into the graphite anode. This was because the solvation number of TMP molecule to the lithium ion decreased. When a SEI film was formed using ethylene carbonate and diethyl carbonate solvents in advance without TMP, the decomposition of the non-carbonate solvent, such as TMP, was suppressed. Eventually, we found that a safe and high-performance lithium ion battery could be fabricated only with a combination of controlling the solvation number in the electrolyte and SEI pre-forming technology on the graphite anode
We have developed new alkoxy-ethyl protecting groups for ArF chemically amplified positive resists.The developed groups show excellent performances in thermal stability, deprotection reaction efficiency, and dissolution contrast. Moreover, we find that the dissolution rates of polymers protected with these groups can be characterized by the polarity and molecular volume of the groups. ArF contact printing experiments also confirm that chemically amplified resists with these groups have good resolution capabilities. Thus the new alkoxy-ethyl groups are shown to have excellent performances as protecting groups for ArF chemically amplified resists.
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