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RISS 인기검색어
- 검색키워드
- 저자 : Komaba, Shinichi (검색결과 3 건)
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Layered $LiCo_{x}Mn_{1-x}O_2$ as Cathode Materials for Li-Ion Batteries
Kumagai, Naoaki,Myung, Seung-Taek,Komaba, Shinichi The Korean Institute of Electrical and Electronic 2001 전기전자재료 Vol.14 No.12
Orthorhombic type LiCo$_{x}$Mn$_{1-x}$ O$_2$(0$\leq$x$\leq$0.14) oxides have been synthesized by hydrothermal treatment of (Co$_{x}$Mn$_{1-x}$ )$_3$O$_4$precursors and LiOH aqueous solution at 17$0^{\circ}C$. As-synthesized powders showed well-ordered $\beta$-MaMnO$_2$structures, and the products were single crystalline particle oxides from TEM observations. The particle size decreased with increasing the amount of Co substituent. Much more improved capacity upon 100 cyclings was clearly seen in orthorhombic LiCo$_{0.1}$Mn$_{0.9}$O$_2$, comparing to orthorhombic LiMnO$_2$..EX>.
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An, Byung Chull,Sakai, Tsuyoshi,Komaba, Shigeru,Kishi, Hiroko,Kobayashi, Sei,Kim, Jin Young,Ikebe, Reiko,Ikebe, Mistuo American Chemical Society 2014 Biochemistry Vol.53 No.49
<P/><P>Motor activity of myosin III is regulated by autophosphorylation. To investigate the role of the kinase activity on the transporter function of myosin IIIA (Myo3A), we identified the phosphorylation sites of kinase domain (KD), which is responsible for the regulation of kinase activity and thus motor function. Using mass spectrometry, we identified six phosphorylation sites in the KD, which are highly conserved among class III myosins and Ste20-related misshapen (Msn) kinases. Two predominant sites, Thr<SUP>184</SUP> and Thr<SUP>188</SUP>, in KD are important for phosphorylation of the KD as well as the motor domain, which regulates the affinity for actin. In the Caco2 cells, the full-length human Myo3A (hMyo3AFull) markedly enlarged the microvilli, although it did not show discrete localization within the microvilli. On the other hand, hMyo3AFull(T184A) and hMyo3AFull(T188A) both showed clear localization at the microvilli tips. Our results suggest that Myo3A induces large actin bundle formation to form microvilli, and phosphorylation of KD at Thr<SUP>184</SUP> and Thr<SUP>188</SUP> is critical for the kinase activity of Myo3A, and regulation of Myo3A translocation to the tip of microvilli. Retinal extracts potently dephosphorylate both KD and motor domain without IQ motifs (MDIQo), which was inhibited by okadaic acid (OA) with nanomolar range and by tautomycetin (TMC) with micromolar range. The results suggest that Myo3A phosphatase is protein phosphatase type 2A (PP2A). Supporting this result, recombinant PP2Ac potently dephosphorylates both KD and MDIQo. We propose that the phosphorylation–dephosphorylation mechanism plays an essential role in mediating the transport and actin bundle formation and stability functions of hMyo3A.</P>
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Choi, Moon-Ho,Yoon, Chong Seung,Myung, Seung-Taek,Lim, Byung-Beom,Komaba, Shinichi,Sun, Yang-Kook The Electrochemical Society 2015 Journal of the Electrochemical Society Vol.162 No.12
<P>Li was incorporated into transition metal layers of Ni-rich Li[Ni<SUB>0.95</SUB>Co<SUB>0.05</SUB>]O<SUB>2</SUB> by formation of a solid solution with Li<SUB>2</SUB>MnO<SUB>3</SUB> (layer notation: Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB>), which can be denoted as (1-<I>x</I>)Li[Ni<SUB>0.95</SUB>Co<SUB>0.05</SUB>]O<SUB>2</SUB> – <I>x</I>Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB>, to understand the effect of Li on the structure, electrochemistry and thermal characteristic of the cathode. Structural analysis data obtained by Rietveld refinement of X-ray diffraction data indicate that the additional Li can be found in the transition metal layers of (1-<I>x</I>)Li[Ni<SUB>0.95</SUB>Co<SUB>0.05</SUB>]O<SUB>2</SUB> – <I>x</I>Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB>. An interesting feature is that the average oxidation states of Ni and Mn are 3+ and 4+, respectively, for (1-<I>x</I>)Li[Ni<SUB>0.95</SUB>Co<SUB>0.05</SUB>]O<SUB>2</SUB> – <I>x</I>Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB> as demonstrated by X-ray absorption study. The first discharge capacity was approximately 217 mAh g<SUP>−1</SUP>, and the resulting retention was above 90% for 0.9Li[Ni<SUB>0.95</SUB>Co<SUB>0.05</SUB>]O<SUB>2</SUB> – 0.1Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB> (Li[Li<SUB>0.033</SUB>Ni<SUB>0.855</SUB>Co<SUB>0.045</SUB>Mn<SUB>0.067</SUB>]O<SUB>2</SUB>) in the range of 2.7 to 4.5 V for 100 cycles, which is a surprising result for Ni-rich compounds. Moreover, the thermal stability of (1-<I>x</I>)Li[Ni<SUB>0.95</SUB>Co<SUB>0.05</SUB>]O<SUB>2</SUB> – <I>x</I>Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB> was significantly improved over the cathodes with identical Ni fraction. These results highlight the role of tetravalent Mn ions, even in small amounts, in stabilizing the electrochemical performances and thermal properties in the Ni-rich layer cathodes.</P>
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