| 研究実績の概要 |
For material synthesis, we have successfully synthesized vertically aligned SWCNTs on quartz and silicon substrate. We also confirmed that BN and MoS2 can be formed on the vertical array. SEM, Raman, optical absorption, TEM have confirmed the existence of BN and MoS2. We have also reveled that, when SWCNTs forms a bundle, BN and MoS2 will wrap over the entire bundle, instead of isolating the SWCNTs in a bundle and coat in each SWCNT. Therefore, understanding and controlling the bundle structure will be important to understand the S loading in for the vertically aligned heteronanotube array.
On the other hand, to understand and improve the performance of Li anode, TMS additives decompose before FEC to enhance the uniformity of Li deposition. Thus, sulfuryl-containing components and increased content of Li2O were introduced into fluorinated SEI, further improving the homogeneity of SEI and promoting more uniform Li deposition than that only in fluorinated SEI. While TMS additives were applied in a Li metal battery with an ultrathin Li anode (33 μm), a high loading LiNi0.5Co0.2Mn0.3O2 (NCM523) cathode (2.5 mA h /cm2 ), and lean electrolyte (7.7 g/ A h), 130 cycles were achieved in Li|NCM523 batteries with TMS additives compared with 60 cycles without additives. This work not only proposes a new type of additives to suppress Li dendrites but also provides guidance for the design of electrolyte formulations to stabilize ultrathin Li anode in practical batteries.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
We have successfully synthesized vertically aligned SWCNTs on quartz and silicon substrate. We also confirmed that BN and MoS2 can be formed on the vertical array. SEM, Raman, optical absorption, TEM have confirmed the existence of BN and MoS2. This year, we co-authored two publications with the international collaborators on the nanostructure and origin of sulfuryl-containing components in SEI from sulfate
additives for stable cycling of ultrathin lithium metal anodes.
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| 今後の研究の推進方策 |
The next research will be focused on two parts.
1. We will further optimize the synthesis technique of vertically aligned heteronanotube array. This includes the optimization of the growth of carbon nanotube template alone, as well as the the optimization of the coating condition of BN and MoS2.
2. We will also characterize the S loaded vertically aligned heteronanotube array, this include the observation of the geometry of composite and also the characterization of interface between S and the heteronanotube. TEM will employed for this experiment.
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| 次年度使用額が生じた理由 |
Because of the global pandemic of Covid-19, the research activities, particularly the international joint experiments are to certain extent delayed. We are optimizing the material and battery from each side. The joint TEM experiments and the related cost will be performed in the next fiscal year.
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