【公開日：2024.07.25】【最終更新日：2024.05.21】

課題データ / Project Data

課題番号 / Project Issue Number

23UT0191

利用課題名 / Title

The study of Zn-MnO2 battery

利用した実施機関 / Support Institute

東京大学 / Tokyo Univ.

機関外・機関内の利用 / External or Internal Use

内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)

技術領域 / Technology Area

【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-

【重要技術領域 / Important Technology Area】（主 / Main）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion（副 / Sub）次世代ナノスケールマテリアル/Next-generation nanoscale materials

キーワード / Keywords

MnO2, CNT, hybrid nanostructure, battery, energy storage,二次電池/ Secondary battery,電極材料/ Electrode material,電子顕微鏡/ Electronic microscope,エネルギー貯蔵/ Energy storage,X線回折/ X-ray diffraction,ナノシート/ Nanosheet

利用者と利用形態 / User and Support Type

利用者名（課題申請者）/ User Name (Project Applicant)

Gong Wei

所属名 / Affiliation

東京大学　大学院工学系研究科

共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes

ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes

Sakata Ichiro

利用形態 / Support Type

（主 / Main）機器利用/Equipment Utilization（副 / Sub）,技術補助/Technical Assistance

利用した主な設備 / Equipment Used in This Project

UT-006：ハイスループット電子顕微鏡
UT-202：高輝度In-plane型X線回折装置
UT-855：高精細電子顕微鏡

報告書データ / Report

概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)

The δ-MnO2 nanosheets were synthesized into continuously interconnected carbon nanotube (CNT) networks by electrochemical deposition, thus imparting both electrical conductivity and mechanical durability to MnO2. We study the reaction mechanism of the MnO2 cathode.

実験 / Experimental

The materials were characterized by field emission scanning electron microscope (FE-SEM, JSM-7800F PRIME, JEOL) equipped with energy-dispersive X-ray Spectroscope, high-resolution TEM (HRTEM, JEM-2800, JEOL), X-ray diffraction pattern (XRD, SuperLab, Rigaku) using a Cu radiation (Kα, λ=0.15406 nm). XPS analyzed the surface chemical composition of the cathode (PHI5000 Versa Probe).

結果と考察 / Results and Discussion

The X-ray diffraction (XRD) pattern (Fig. 1) exhibit diffraction peaks at around 12.0^o, 36.7^o, and 65.7^o corresponding to 001 plane (an interlayer spacing of 7.35 Å), 110 plane (an inter-planar distance of 2.45 Å), and 020 plane, respectively, which was clearly recognizable to be birnessite (JCPDS: 42-1317). The XRD analysis suggest the formation of birnessite, however, the low intensity of peaks imply the poor degree of crystallinity. High-resolution transmission electron microscopy (HRTEM) images of birnessite are shown in Fig. 1. Birnessite consist of nanosheet-like flakes with a lattice spacing of 0.73 nm that corresponded to the crystal plane of (001), which is consistent with XRD data. The energy-dispersive X-ray spectroscope (EDS) mapping (Fig. S1) show the homogeneous distribution of Mn (pink), O (green), and Cs (blue, interlayer cation) elements, indicating that Cs⁺ as the interlayer cation is uniformly distributed in between the layers of birnessite (Cs_0.28MnO₂ calculated by the atom % from EDS data).

図・表・数式 / Figures, Tables and Equations

Fig. 1 XRD, TEM, and EDS of the birnessite-MnO₂

その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)

The authors thank Mr Hiroyuki Oshikawa, Mr Masahiro Fukukawa, and Mr Kazuhiro Fukawa (Institute of Engineering Innovation, School of Engineering, The University of Tokyo) for their valuable assistance in HR-TEM, FE-SEM, and XRD experiments. The HR-TEM, FE-SEM, and XRD measurements were conducted in Research Hub for Advanced Nano Characterization, The University of Tokyo, supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

成果発表・成果利用 / Publication and Patents

論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)

1. Guilin Chi, Wire-shaped, all-solid-state, high-performance flexible asymmetric supercapacitors based on (Mn,Fe) oxides/reduced graphene oxide/oxidized carbon nanotube fiber hybrid electrodes, Nano Energy, 117, 108887(2023).
   DOI: 10.1016/j.nanoen.2023.108887
   

口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.

特許 / Patents

特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件