• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Ti surface doping of LiNi0.5Mn1.5O4-delta positive electrodes for lithium ion batteries
【24h】

Ti surface doping of LiNi0.5Mn1.5O4-delta positive electrodes for lithium ion batteries

机译：用于锂离子电池的LINI0.5MN1.5O4-DELTA正电极的TI表面掺杂

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The particle surface of LiNi0.5Mn1.5O4-delta (LNMO), a Li-ion battery cathode material, has been modified by Ti cation doping through a hydrolysis-condensation reaction followed by annealing in oxygen. The effect of different annealing temperatures (500-850 degrees C) on the Ti distribution and electrochemical performance of the surface modified LNMO was investigated. Ti cations diffuse from the preformed amorphous 'TiOx' layer into the LNMO surface during annealing at 500 degrees C. This results in a 2-4 nm thick Ti-rich spinel surface having lower Mn and Ni content compared to the core of the LNMO particles, which was observed with scanning transmission electron microscopy coupled with compositional EDX mapping. An increase in the annealing temperature promotes the formation of a Ti bulk doped LiNi(0.5-w)Mn(1.5+w)-tTitO4 phase and Ti-rich LiNi0.5Mn1.5-yTiyO4 segregates above 750 degrees C. Fourier-transform infrared spectrometry indicates increasing Ni-Mn ordering with annealing temperature, for both bare and surface modified LNMO. Ti surface modified LNMO annealed at 500 degrees C shows a superior cyclic stability, coulombic efficiency and rate performance compared to bare LNMO annealed at 500 degrees C when cycled at 3.4-4.9 V vs. Li/Li+. The improvements are probably due to suppressed Ni and Mn dissolution with Ti surface doping.
机译：LINI0.5MN1.5O4-DERTA（LNMO），锂离子电池阴极材料的颗粒表面已经通过TI阳离子掺杂通过水解 - 缩合反应，然后在氧中退火。研究了不同退火温度（500-850℃）对表面改性LNMO的Ti分布和电化学性能的影响。在退火期间，Ti阳离子在退火时从预制的无定形'TiOx'层扩散到LNMO表面中，这导致与LNMO颗粒的核心相比，这导致具有较低的Mn和Ni含量的2-4nm厚的Ti致尖晶石表面，用扫描透射电子显微镜观察到与组成EDX映射耦合的扫描透射电子显微镜。退火温度的增加促进了Ti散装掺杂LiNi（0.5-W）Mn（1.5±W）-TitO4相和富含Ti的LiNi0.5Mn1.5-YtiyO 4偏析750℃的傅立叶变换红外线的形成光谱测定表明，对于裸露和表面改性的LNMO，光谱测量表明增加了Ni-Mn排序。在500摄氏度下，Ti表面改性的LNMO退火显示出优异的循环稳定性，与在500摄氏度以3.4-4.9V与Li / Li +循环时以500摄氏度退火的裸LNMO相比。改善可能是由于抑制了Ni和Mn溶解与Ti表面掺杂。

著录项

  • 来源
    《RSC Advances》 |2018年第13期|共14页
  • 作者

    Okudur F. Ulu; DHaen J.; Vranken T.; De Sloovere D.; Verheijen M.; Karakulina O. M.; Abakumov A. M.; Hadermann J.; Van Bael M. K.; Hardy A.;

  • 作者单位

    UHasselt Inst Mat Res IMO IMOMEC Energyville Inorgan &

    Phys Chem Agoralaan B-3590 Diepenbeek Belgium;

    UHasselt Inst Mat Res IMO IMOMEC Mat Phys Wetenschapspk 1 B-3590 Diepenbeek Belgium;

    UHasselt Inst Mat Res IMO IMOMEC Energyville Inorgan &

    Phys Chem Agoralaan B-3590 Diepenbeek Belgium;

    UHasselt Inst Mat Res IMO IMOMEC Energyville Inorgan &

    Phys Chem Agoralaan B-3590 Diepenbeek Belgium;

    UHasselt Inst Mat Res IMO IMOMEC Energyville Inorgan &

    Phys Chem Agoralaan B-3590 Diepenbeek Belgium;

    Univ Antwerp EMAT Groenenborgerlaan 171 B-2020 Antwerp Belgium;

    Univ Antwerp EMAT Groenenborgerlaan 171 B-2020 Antwerp Belgium;

    Univ Antwerp EMAT Groenenborgerlaan 171 B-2020 Antwerp Belgium;

    UHasselt Inst Mat Res IMO IMOMEC Energyville Inorgan &

    Phys Chem Agoralaan B-3590 Diepenbeek Belgium;

    UHasselt Inst Mat Res IMO IMOMEC Energyville Inorgan &

    Phys Chem Agoralaan B-3590 Diepenbeek Belgium;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号