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首页> 外文期刊>Advanced energy materials >A Novel Surface Treatment Method and New Insight into Discharge Voltage Deterioration for High-Performance 0.4Li2MnO3–0.6LiNi1/3Co1/3Mn1/3O2 Cathode Materials
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A Novel Surface Treatment Method and New Insight into Discharge Voltage Deterioration for High-Performance 0.4Li2MnO3–0.6LiNi1/3Co1/3Mn1/3O2 Cathode Materials

机译：新型0.4Li2MnO3–0.6LiNi1 / 3Co1 / 3Mn1 / 3O2正极材料的表面处理方法和放电电压劣化的新认识

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摘要

The Li-rich cathode materials have been considered as one of the most promising cathodes for high energy Li-ion batteries. However, realization of these materials for use in Li-ion batteries is currently limited by their intrinsic problems. To overcome this barrier, a new surface treatment concept is proposed in which a hybrid surface layer composed of a reduced graphene oxide (rGO) coating and a chemically activated layer is created. A few layers of GO are first coated on the surface of the Li-rich cathode material, followed by a hydrazine treatment to produce the reducing agent of GO and the chemical activator of the Li2MnO3 phase. Compared to previous studies, this surface treatment provides substantially improved electrochemical performance in terms of initial Coulombic effiency and retention of discharge voltage. As a result, the surface-treated 0.4Li­2MnO3–0.6LiNi1/3Co1/3Mn1/3O2 exhibits a high capacity efficiency of 99.5% during the first cycle a the discharge capacity of 250 mAh g−1 (2.0–4.6 V under 0.1C), 94.6% discharge voltage retention during 100 cycles (1C) and the superior capacity retention of 60% at 12C at 24 °C.
机译：富锂阴极材料被认为是高能锂离子电池最有希望的阴极之一。然而，目前用于锂离子电池的这些材料的实现受到其固有问题的限制。为了克服这一障碍，提出了一种新的表面处理概念，其中创建了由还原的氧化石墨烯（rGO）涂层和化学活化层组成的混合表面层。首先在富锂阴极材料的表面上涂覆几层GO，然后进行肼处理，以生产GO的还原剂和Li2MnO3相的化学活化剂。与以前的研究相比，该表面处理在初始库仑效率和保持放电电压方面提供了显着改善的电化学性能。结果，经表面处理的0.4Li2MnO3–0.6LiNi1 / 3Co1 / 3Mn1 / 3O2在第一个循环中表现出99.5％的高容量效率，放电容量为250 mAh g-1（在0.1C下为2.0–4.6 V） ，在100个循环（1C）时具有94.6％的放电电压保持率，在24°C和12C时具有60％的出色容量保持率。

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  • 来源
    《Advanced energy materials》 |2014年第16期|1-9|共9页
  • 作者

    Pilgun Oh; Minseong Ko; Seungjun Myeong; Youngsik Kim; Jaephil Cho;

  • 作者单位

    School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan Korea;

    School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan Korea;

    School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan Korea;

    School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan Korea;

    School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) Ulsan Korea;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    lithium-ion batteries; cathodes; surface treatments; electrodes; chemical treatments;

    机译：锂离子电池;阴极;表面处理;电极;化学处理;

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