Mechanism of the Loss of Capacity of LiNiO2 Electrodes for Use in Aqueous Li-Ion Batteries: Unveiling a Fundamental Cause of Deterioration in an Aqueous Electrolyte through In Situ Raman Observation,ACS Applied Materials & Interfaces

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Mechanism of the Loss of Capacity of LiNiO2 Electrodes for Use in Aqueous Li-Ion Batteries: Unveiling a Fundamental Cause of Deterioration in an Aqueous Electrolyte through In Situ Raman Observation
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-12-01 , DOI: 10.1021/acsami.0c18157
Changhee Lee ₁ , Yuko Yokoyama ₁ , Yasuyuki Kondo ₁ , Yuto Miyahara ₁ , Takeshi Abe ₁ , Kohei Miyazaki ₁

Affiliation

This study investigated the fundamental mechanisms of the loss of capacity of LiNiO₂ (LNO) electrodes for Li⁺ insertion/deinsertion with a special focus on the origin of this deterioration in an aqueous system. In situ Raman spectra revealed that the intercalation of H⁺ ions formed a NiOOH_x film at the surface of LNO during the initial electrochemical cycles; this NiOOH_x film was also confirmed by X-ray photoelectron spectroscopy and transmission electron microscopy analysis. The formation of an electrochemically inactive spinel-like phase (Ni₃O₄) at the subsurface was triggered by the absence of Li in the NiOOH_x film at the surface. These structural changes of LNO, accelerated by the intercalation of H⁺ ions, were considered to be the fundamental cause of the greater loss of capacity in the aqueous system.

中文翻译：

用于水性锂离子电池的LiNiO ₂电极容量损失的机理：通过原位拉曼观察揭示水性电解质劣化的根本原因

这项研究调查了LiNiO ₂（LNO）电极用于Li ⁺插入/插入的容量损失的基本机理，特别关注了水性系统中这种劣化的起因。原位拉曼光谱表明，在最初的电化学循环中，H ⁺离子的插入在LNO表面形成了NiOOH _x膜。通过X射线光电子能谱和透射电子显微镜分析也证实了该NiOOH _x膜。NiOOH _x中不存在锂会触发在表面下形成电化学惰性的尖晶石状相（Ni ₃ O ₄）。膜在表面。通过插入H ⁺离子而加速的LNO的这些结构变化被认为是水性系统容量损失更大的根本原因。

更新日期：2020-12-16

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