単価イオンを持つ拡張濃縮超リン酸フレームワークは,リチウムの移動性と高い計算された電気化学的安定性を組み合わせます
Guopeng Han1, Andrij Vasylenko1, Alex R Neale1,2
1Department of Chemistry, University of Liverpool, Crown Street, Liverpool, L69 7ZD, United Kingdom.
Journal of the American Chemical Society
|October 22, 2021
まとめ
研究者らは,リチウム超リン酸材料であるLi3P5O14とLi4P6O17を開発し,先進リチウムイオン電池のイオン伝導性と電気化学的安定性を向上させました.
科学分野:
- 固体無機化学
- 材料科学
- 電気化学
背景:
- 拡張アニオンフレームワークは多様ですが,リチウム超リン酸は報告されていません.
- リン酸塩とシリケートは地球に豊富に存在するが,リチウムを含むその超リン酸塩の形態は未調査である.
- 新しい固体電解質の開発は 次世代のエネルギー貯蔵に不可欠です
研究 の 目的:
- 新しいリチウム超リン酸化合物を合成し特徴づけること.
- これらの新材料のイオン伝導性と電気化学的性質を調査する.
- リチウムイオン電池の 固体電解質としての可能性を探るため
主な方法:
- Li3P5O14とLi4P6O17の結晶構造の決定
- イオン伝導度測定のためのインペデンススペクトロスコーピーとDC極化.
- 電気化学的評価のためのNMRスペクトロスコーピーと 静電塗装/剥離
主要な成果:
- Li3P5O14の層状の超リン酸構造と,リ4P6O17のループ型の鎖を発見した.
- Li3P5O14は高いイオン伝導性 (8.5~5) ×10−7 S cm~1) と低い活性化エネルギー (0.43~7) を表している.
- 両化合物は酸化に対する高い熱力学的安定性を示し,Li3P5O14は4. 8Vに安定している.
結論:
- 新しいリチウム超リン酸は,固体電解質のための新しい構造基盤を提供します.
- Li3P5O14はリチウムイオン電池の用途に有望なイオン伝導性と電気化学的安定性を示しています.
- これらの材料は,電解質の性能を最適化するための新しい戦略を提供し,潜在的にカソッドコーティングです.
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