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Increased cycling stability of Li4Ti5O12-coated LiMn1.5Ni0.5O4 as cathode material for lithium-ion batteries

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Title: Increased cycling stability of Li4Ti5O12-coated LiMn1.5Ni0.5O4 as cathode material for lithium-ion batteries
Authors: Zhu, Yan-Rong1, Yi, Ting-Feng tfyihit@163.com, Zhu, Rong-Sun1, Zhou, An-Na1
Source: Ceramics International. Apr2013, Vol. 39 Issue 3, p3087-3094. 8p.
Subjects: Chemical stability, Lithium compounds, Metal coating, Cathodes, Lithium-ion batteries, Sol-gel processes, High temperatures, Scanning electron microscopy
Abstract: Abstract: Li4Ti5O12 (LTO)-coated 5V spinel LiMn1.5Ni0.5O4 as cathode was prepared by the sol–gel method followed by high-temperature calcinations. The structural and electrochemical properties of these cathodes were investigated using differential thermal analysis (DTA) and thermogravimetery (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), and charge–discharge studies. TG–DTA shows that LiMn1.5Ni0.5O4 spinel forms at about 400°C. XRD reveals that a substitutional compound LiMn2−x−y Ni x Ti y O4 can be formed when the coated content of LTO exceeds 3wt%. SEM exhibits that the coated LiMn1.5Ni0.5O4 is covered with small particles that consist mainly of LTO. CV and dQ/dV versus voltage curves demonstrate that the modified material exhibits remarkably enhanced electrochemical reversibility and stability. The charge–discharge test indicates that 3wt% LTO-coated LiMn1.5Ni0.5O4 has excellent fast charge–discharge performances. These results reveal that LTO-coated layer protects the surface of the active materials from HF in the electrolyte during electrochemical cycling. As a result, the surface-modification of LiMn1.5Ni0.5O4 with LTO should be an effective way to improve the fast charge–discharge properties. [Copyright &y& Elsevier]
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Database: Engineering Source
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Abstract:Abstract: Li4Ti5O12 (LTO)-coated 5V spinel LiMn1.5Ni0.5O4 as cathode was prepared by the sol–gel method followed by high-temperature calcinations. The structural and electrochemical properties of these cathodes were investigated using differential thermal analysis (DTA) and thermogravimetery (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), and charge–discharge studies. TG–DTA shows that LiMn1.5Ni0.5O4 spinel forms at about 400°C. XRD reveals that a substitutional compound LiMn2−x−y Ni x Ti y O4 can be formed when the coated content of LTO exceeds 3wt%. SEM exhibits that the coated LiMn1.5Ni0.5O4 is covered with small particles that consist mainly of LTO. CV and dQ/dV versus voltage curves demonstrate that the modified material exhibits remarkably enhanced electrochemical reversibility and stability. The charge–discharge test indicates that 3wt% LTO-coated LiMn1.5Ni0.5O4 has excellent fast charge–discharge performances. These results reveal that LTO-coated layer protects the surface of the active materials from HF in the electrolyte during electrochemical cycling. As a result, the surface-modification of LiMn1.5Ni0.5O4 with LTO should be an effective way to improve the fast charge–discharge properties. [Copyright &y& Elsevier]
ISSN:02728842
DOI:10.1016/j.ceramint.2012.09.088