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Dynamic structural changes at LiMn$$_{2}$$2O$$_{4}$$/electrolyte interface during lithium battery reaction

リチウムイオン電池反応におけるLiMn$$_{2}$$2O$$_{4}$$/電解質界面の構造変化ダイナミクス

平山 雅章*; 井戸 秀和*; Kim, K.-S.*; Cho, W.*; 田村 和久  ; 水木 純一郎; 菅野 了次*

Hirayama, Masaaki*; Ido, Hidekazu*; Kim, K.-S.*; Cho, W.*; Tamura, Kazuhisa; Mizuki, Junichiro; Kanno, Ryoji*

表面X線散乱法を用いて、リチウムイオン電池反応過程におけるLiMn$$_{2}$$O$$_{4}$$/電解質界面の構造変化を調べた。その結果、まず最初に、電気二重層の形成と同時に表面構造の変化が起き、電圧をかけると同時に再構成が起きることがわかった。また、SEI層の組成を解析した結果、(111)面と(110)面では、(110)面の方がより多くMnが検出されたことから、(111)面の方がより安定であることがわかった。

Epitaxial LiMn$$_{2}$$O$$_{4}$$ thin films with restricted lattice planes (111) and (110) are grown on SrTiO$$_{3}$$ substrates by pulsed laser deposition. In situ SXRD studies have revealed dynamic structural changes that reduce the atomic symmetry at the electrode surface during the initial electrochemical reaction. The surface structural changes commence with the formation of an electric double layer, which is followed by surface reconstruction when a voltage is applied in the first charge process. Transmission electron microscopy images after 10 cycles confirm the formation of a solid electrolyte interface (SEI) layer on both the (111) and (110) surfaces and Mn dissolution from the (110) surface. The (111) surface is more stable than the (110) surface. The electrode stability of LiMn$$_{2}$$O$$_{4}$$ depends on the reaction rate of SEI formation and the stability of the reconstructed surface structure.

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パーセンタイル:97.95

分野:Chemistry, Multidisciplinary

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