Investigation and improvement on the electrochemical performance and storage characteristics of LiNiO₂-based materials for lithium ion battery

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• 作者：Xiaobo Zheng ; Xinhai Li ; ^{xinhaili_@126.com" class="auth_mail" title="E-mail the corresponding author} ; Zhixing Wang ; Huajun Guo ; Zhenjun Huang ; Guochun Yan ; Ding Wang
• 关键词：Lithium nickel cobalt manganese oxide ; Alcohol washing ; Cationic disorder ; Capacity retention ; Storage characteristic
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 February 2016
• 年：2016
• 卷：191
• 期：Complete
• 页码：832-840
• 全文大小：3407 K

文摘

Poor storage property and the rapid moisture hinder the application of LiNi_0.8Co_0.1Mn_0.1O₂ due to the formation of Li₂CO₃/LiOH impurities and a spontaneous reduction of Ni³⁺ to Ni²⁺ on the surface. Alcohol washing is desirable to improve the electrochemical performance, storage characteristics and structural stability of LiNi_0.8Co_0.1Mn_0.1O₂. Electrochemical studies indicate that washed material exhibits a higher discharge capacity (148 mAh g⁻¹ at 8 C) and better capacity retention at 2 C (79.2% after 100 cycles) compared with the un-treated material after storage in air for 40 days. Inductively coupled plasma (ICP) tests show the amount of metal dissolution decreases compared with the un-washed sample. The Rietveld refinement results indicate that the Li/Ni cationic disorder can be reduced from 0.0714 to 0.0538 by alcohol washing after storage. Transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) indicate alcohol washing contributes LiNi_0.8Co_0.1Mn_0.1O₂ much resistant to H₂O and CO₂, which further reduce the formation of Li₂CO₃ and maintain structural stability during the storage process.