【公開日：2025.06.10】【最終更新日：2025.04.10】

課題データ / Project Data

課題番号 / Project Issue Number

24NM5407

利用課題名 / Title

Li MnO2 primary lithium battery improvement

利用した実施機関 / Support Institute

物質・材料研究機構 / NIMS

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）物質・材料合成プロセス/Molecule & Material Synthesis

【重要技術領域 / Important Technology Area】（主 / Main）その他/Others（副 / Sub）-

キーワード / Keywords

Energy storage materials, lithium ion battery, Inductively coupled plasma emission spectroscopy

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)

Lin Chia-Ching

所属名 / Affiliation

物質・材料研究機構

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

岩撫 暁生

利用形態 / Support Type

（主 / Main）技術代行/Technology Substitution（副 / Sub）-

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

NM-203：誘導結合プラズマ発光分析装置群

報告書データ / Report

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

To measure the manganese dissolution in the electrolyte by ICP.

実験 / Experimental

After cycles, the lithium metal and deposited manganese was dissolved in the acid and measure the ICP test.

結果と考察 / Results and Discussion

We performed ICP-OES tests on cells with different electrolytes and Li₃PO₄ surface coatings after 100 cycles. The results, presented in Table 1, reveal Mn dissolution levels of 19.8, 22.9, and 27.4 at% in the voltage range of 1.5–4.2 V and 27.3, 31.9, and 37.2 at% in the voltage range of 1.5–4.8 V for electrodes tested in 1M LiPF₆ in EC/EMC with volume ratios of 3:7, 5:5, and 7:3, respectively. These findings indicate that higher Mn dissolution correlates with increased EC content and a higher voltage cutoff, suggesting that side reactions between MnO₂ and the electrolyte contribute to dissolution. Applying a 2 wt% Li₃PO₄ coating to MnO₂ significantly reduces Mn dissolution, lowering it to 5.2 at% and 7.2 at% in 1M LiPF₆ in EC/EMC (3:7 ratio) at voltage ranges of 1.5–4.2 V and 1.5–4.8 V, respectively, after 100 cycles. This demonstrates that the surface coating effectively minimizes direct contact between MnO₂ particles and the electrolyte, thereby reducing Mn dissolution.

図・表・数式 / Figures, Tables and Equations

Table1. Percentage of LiMnO₂ and LiMn₂O₄ phases from Rietveld refinement analyses in the β-MnO₂ materials, amount of Mn dissolution from the electrodes, capacity drop and percentage of capacity drop contributed by Mn dissolution after 100 cycles using different electrolytes in different voltage ranges.

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

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)

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