Effect of TiO2-coating on structure and electrochemical performance of LiCo0.2Ni0.4Mn0.4O2

• 来源期刊: 中国高等学校学术文摘·化学
• 关键词: LiCo0.2Ni0.4Mn0.4O2 TiO2-coating electro-chemical performance lithium ion batteries
• 年，卷（期）: 2008,（1）
• 页码范围: 64-69
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11458-007-008-0020-5

摘要

LiCo0.2Ni0.4Mn0.4O2, as the cathode materia for lithium ion batteries, was modified by TiO2-coatingThe effect of TiO2-coating on the structure and electro-chemical performance of LiCo0.2Ni0.4Mn0.4O2 was char-acterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and galvanostatic charge-discharge tests. The results suggest that a small amount of TiO2-coating doesnot change the crystalline structure, but considerably improves the electrochemical performance of LiCo0.2Ni0.4Mn0.4O2 in terms of capacity delivery and cyclability. XPS measurements confirm that the improved electrochemical performance is most possibly attributed to a decrease in interaction between the layered material and non-aqueous electrolyte during the charge-discharge processes.