マンガンの豊富なリチウムイオン電池カトドの界面安定性に対する電解質添加物の影響
Nikita S Dutta1, Madison King1,2, Bingning Wang3
1Materials, Chemistry, and Computational Sciences, National Renewable Energy Laboratory, Golden, Colorado 80401, United States.
まとめ
研究者は,電解質添加物を用いてコバルトフリーリチウムイオン電池カトドの安定性を改善しました. LiDFOBとTMSPiの組み合わせにより,LMR- NM細胞のサイクル性能と比容量は28%向上しました.
科学分野:
- 材料科学
- 電気化学
- エネルギー貯蔵
背景:
- コバルトのないリチウムとマンガンの豊富な (LMR-NM) カトードはリチウムイオン電池の費用対効果の高い代替品ですが,長期サイクルの安定性が低下しています.
- 従来のコバルト含有型カトッドはコストとサプライチェーンの課題に直面し,地球に豊富な材料のソリューションの必要性を高めています.
研究 の 目的:
- 電解質添加物,特にリチウム二酸化硫酸塩 (LiDFOB),トリメチルシリル) フォスフィート (TMSPi),ビニル炭酸塩 (VC) のLMR-NM細胞の循環性能の向上に関する有効性を調査する.
- 先進的なナノスケール特性を用いて,カトド電解質インターフェーズ (CEI) 特性と電気化学性能との構造機能関係を確立する.
主な方法:
- 各種の電解質添加物の組み合わせによるLMR-NM細胞の電気化学サイクル.
- CEIのナノスケール分析のための電子エネルギー損失スペクトロスコーピー (EELS) と結合した冷凍スキャニング伝送電子顕微鏡 (cryo-STEM).
- Mnイオン溶解とCEI形態と化学の分析
主要な成果:
- 2重%のTMSPi + 1重%のLiDFOBの組み合わせは,個々の添加物とベースラインの電解質と比較して優れた性能を示した.
- TMSPi + LiDFOB添加物の組み合わせによる長期サイクリングで,比容量の28%の改善が達成されました.
- LiDFOBはマンガンイオンの溶解を緩和し,CEI表面でMnを安定させ,TMSPiはCEIの保護構造 (∼7~15 nm) に寄与することが判明した.
結論:
- 電解質工学は,特にTMSPiとLiDFOBを使用することで,長期サイクル安定性と,土に豊富なLMR-NMカトドの性能を大幅に改善することができます.
- LiDFOBとTMSPiの相乗効果は,電解質の分解を防止し,バッテリーの性能を維持するために不可欠なCEIの形成と安定性を高めます.
- これらの発見は,将来のエネルギー貯蔵アプリケーションのために,より手頃で信頼性の高いリチウムイオン電池の開発への道を開きます.
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