MgO coated P2-Na0.67Mn0.75Ni0.25O2 layered oxide cathode for Na-Ion batteries

IF 5.4 Q2 CHEMISTRY, PHYSICAL Journal of Power Sources Advances Pub Date : 2024-01-01 DOI:10.1016/j.powera.2024.100135

Cornelius Gauckler , Gints Kucinskis , Lukas Fridolin Pfeiffer , Abdelaziz A. Abdellatif , Yushu Tang , Christian Kübel , Fabio Maroni , Ruihao Gong , Margret Wohlfahrt-Mehrens , Peter Axmann , Mario Marinaro

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Abstract

In this study, we propose an effective strategy to improve the electrochemical performance of a P2-Na_0.67Mn_0.75Ni_0.25O₂ (P2-MNO) cathode material for Na-ion batteries based on MgO surface coating. The MgO coating, with a thickness of ∼20–50 nm, is obtained by means of a facile wet-chemistry approach followed by heat treatment carried out at comparatively low temperatures (400–500 °C) in order to avoid possible Mg doping in the bulk of the P2-MNO. Detailed electrochemical investigations demonstrate improved electrochemical performance of the MgO-coated material (M-P2-MNO) in comparison to pristine bare one at both room and elevated (40 °C) temperatures. Operando differential electrochemical mass spectroscopy (DEMS) demonstrate that the MgO coating is effective in suppressing unwanted gas evolution due to side reactions thus stabilizing the cathode/electrolyte interface.

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用于钠离子电池的氧化镁涂层 P2-Na0.67Mn0.75Ni0.25O2 层状氧化物阴极

在本研究中，我们提出了一种基于氧化镁表面涂层的有效策略，以改善用于纳离子电池的 P2-Na0.67Mn0.75Ni0.25O2 (P2-MNO) 阴极材料的电化学性能。氧化镁涂层的厚度为 20-50 纳米，是通过一种简便的湿化学方法获得的，随后在相对较低的温度（400-500 °C）下进行热处理，以避免在 P2-MNO 的主体中掺杂镁。详细的电化学研究表明，氧化镁涂层材料（M-P2-MNO）在室温和高温（40 °C）下的电化学性能均优于原始裸露材料。操作微分电化学质谱 (DEMS) 显示，氧化镁涂层能有效抑制副反应引起的不必要的气体演化，从而稳定阴极/电解质界面。

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