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Abstract <p>Here, we study processes of Li insertion into Ni<sub>3</sub>Si<sub>2</sub>O<sub>5</sub>(OH)<sub>4</sub> phyllosilicate nanoscrolls in the 0.01–4.5 V voltage range aiming to establish electrochemical reactions and reveal the reasons of electrode degradation. The first cathodic polarization initiates the phyllosilicate crystal structure destruction with formation of NiO, and probably SiO<sub>2</sub> and Si, capable of reversible interaction with lithium. As cycling proceeds, the electrode capacity decreases, and the cathodic/anodic processes voltages change. The main cause of the degradation of nickel phyllosilicate-based electrodes is a decrease in the electrochemical activity of nickel oxide and its gradual transition first to cubic Li<sub><i>x</i></sub>Ni<sub>2–<i>x</i></sub>O<sub>2</sub> and then to hexagonal LiNiO<sub>2</sub>.</p>

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Electrochemical Lithiation of Nickel Phyllosilicate Nanoscrolls in the 0.01–4.5 V Voltage Range

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • D. A. Krasilina,
  • P. V. Larosh,
  • E. K. Khrapova,
  • A. M. Rumyantsev,
  • A. A. Krasilin

摘要

Abstract

Here, we study processes of Li insertion into Ni3Si2O5(OH)4 phyllosilicate nanoscrolls in the 0.01–4.5 V voltage range aiming to establish electrochemical reactions and reveal the reasons of electrode degradation. The first cathodic polarization initiates the phyllosilicate crystal structure destruction with formation of NiO, and probably SiO2 and Si, capable of reversible interaction with lithium. As cycling proceeds, the electrode capacity decreases, and the cathodic/anodic processes voltages change. The main cause of the degradation of nickel phyllosilicate-based electrodes is a decrease in the electrochemical activity of nickel oxide and its gradual transition first to cubic LixNi2–xO2 and then to hexagonal LiNiO2.