Ultrafast Dischargeable LiMn2O4 Thin-Film Electrodes with Pseudocapacitive Properties for Microbatteries

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• 作者：Marcus FehseRafael Trócoli ; Edgar Ventosa ; Elba HernándezAlfonso Sepúlveda ; Alex Morata ; Albert Tarancón
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：February 15, 2017
• 年：2017
• 卷：9
• 期：6
• 页码：5295-5301
• 全文大小：492K
• ISSN：1944-8252

文摘

LiMn₂O₄ (LMO) thin films are deposited on Si-based substrates with Pt current collector via multi-layer pulsed-laser-deposition technique. The LMO thin films feature unique kinetics that yield outstanding electrochemical cycling performance in an aqueous environment. At extremely high current densities of up to 1880 μA cm^–2 (≈ 348 C), a reversible capacity of 2.6 μAh cm^–2 is reached. Furthermore, the electrochemical cycling remains very stable for over 3500 cycles with a remarkable capacity retention of 99.996% per cycle. We provide evidence of significant nondiffusion-controlled, pseudocapacitive-like storage contribution of the LMO electrode.