电解质
材料科学
溶解
阴极
电化学
降级(电信)
化学工程
电池(电)
锂离子电池
过渡金属
无机化学
锂(药物)
电极
催化作用
化学
有机化学
物理化学
工程类
功率(物理)
内分泌学
物理
电信
医学
量子力学
计算机科学
作者
Di Huang,Chaiwat Engtrakul,Sanjini U. Nanayakkara,David W. Mulder,Sang‐Don Han,Meng Zhou,Hongmei Luo,Robert C. Tenent
标识
DOI:10.1021/acsami.0c22235
摘要
Lithium transition-metal oxides (LiMn2O4 and LiMO2 where M = Ni, Mn, Co, etc.) are widely applied as cathode materials in lithium-ion batteries due to their considerable capacity and energy density. However, multiple processes occurring at the cathode/electrolyte interface lead to overall performance degradation. One key failure mechanism is the dissolution of transition metals from the cathode. This work presents results combining scanning electrochemical microscopy with inductively coupled plasma (ICP) and electron paramagnetic resonance (EPR) spectroscopies to examine cathode degradation products. Our effort employs a LiMn2O4 (LMO) thin film as a model cathode to monitor the Mn dissolution process without the potential complications of conductive additive and polymer binders. We characterize the electrochemical behavior of LMO degradation products in various electrolytes, paired with ICP and EPR, to better understand the properties of Mn complexes formed following metal dissolution. We find that the identity of the lithium salt anions in our electrolyte systems [ClO4–, PF6–, and (CF3SO2)2N–] appears to affect the Mn dissolution process significantly as well as the electrochemical behavior of the generated Mn complexes. This implies that the mechanism for Mn dissolution is at least partially dependent on the lithium salt anion.
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