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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]
Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 85181929
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Increased cycling stability of Li<subscript>4</subscript>Ti<subscript>5</subscript>O<subscript>12</subscript>-coated LiMn<subscript>1.5</subscript>Ni<subscript>0.5</subscript>O<subscript>4</subscript> as cathode material for lithium-ion batteries
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  Data: <searchLink fieldCode="JN" term="%22Ceramics+International%22">Ceramics International</searchLink>. Apr2013, Vol. 39 Issue 3, p3087-3094. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Chemical+stability%22">Chemical stability</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium+compounds%22">Lithium compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+coating%22">Metal coating</searchLink><br /><searchLink fieldCode="DE" term="%22Cathodes%22">Cathodes</searchLink><br /><searchLink fieldCode="DE" term="%22Lithium-ion+batteries%22">Lithium-ion batteries</searchLink><br /><searchLink fieldCode="DE" term="%22Sol-gel+processes%22">Sol-gel processes</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Scanning+electron+microscopy%22">Scanning electron microscopy</searchLink>
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  Data: 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]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.ceramint.2012.09.088
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      – Code: eng
        Text: English
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        PageCount: 8
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      – SubjectFull: Chemical stability
        Type: general
      – SubjectFull: Lithium compounds
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      – SubjectFull: Metal coating
        Type: general
      – SubjectFull: Cathodes
        Type: general
      – SubjectFull: Lithium-ion batteries
        Type: general
      – SubjectFull: Sol-gel processes
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      – SubjectFull: High temperatures
        Type: general
      – SubjectFull: Scanning electron microscopy
        Type: general
    Titles:
      – TitleFull: Increased cycling stability of Li4Ti5O12-coated LiMn1.5Ni0.5O4 as cathode material for lithium-ion batteries
        Type: main
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            NameFull: Zhu, Yan-Rong
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            NameFull: Yi, Ting-Feng
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            NameFull: Zhu, Rong-Sun
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            NameFull: Zhou, An-Na
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            – D: 01
              M: 04
              Text: Apr2013
              Type: published
              Y: 2013
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