• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced energy materials >Native Vacancy Enhanced Oxygen Redox Reversibility and Structural Robustness
【24h】

Native Vacancy Enhanced Oxygen Redox Reversibility and Structural Robustness

机译：本机空缺增强氧气氧化还原可逆性和结构鲁棒性

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

Cathode materials with high energy density, long cycle life, and low cost are of top priority for energy storage systems. The Li-rich transition metal (TM) oxides achieve high specific capacities by redox reactions of both the TM and oxygen ions. However, the poor reversible redox reaction of the anions results in severe fading of the cycling performance. Herein, the vacancy-containing Na-4/7[Mn-6/7(◻(Mn))(1/7)]O-2 (◻(Mn) for vacancies in the Mn Symbol of the Klingon Empire O slab) is presented as a novel cathode material for Na-ion batteries. The presence of native vacancies endows this material with attractive properties including high structural flexibility and stability upon Na-ion extraction and insertion and high reversibility of oxygen redox reaction. Synchrotron X-ray absorption near edge structure and X-ray photoelectron spectroscopy studies demonstrate that the charge compensation is dominated by the oxygen redox reaction and Mn3+/Mn4+ redox reaction separately. In situ synchrotron X-ray diffraction exhibits its zero-strain feature during the cycling. Density functional theory calculations further deepen the understanding of the charge compensation by oxygen and manganese redox reactions and the immobility of the Mn ions in the material. These findings provide new ideas on searching for and designing materials with high capacity and high structural stability for novel energy storage systems.
机译：具有高能量密度，长循环寿命和低成本的阴极材料是能量存储系统的首要任务。富锂过渡金属（TM）氧化物通过TM和氧离子的氧化还原反应实现了高特异性。然而，阴离子的可逆氧化还原反应差导致循环性能的严重衰落。在本文中，含有空位的Na-4/7 [Mn-6/7（1/7））（1/7）] O-2（◻（Mn），用于Klingon帝国o板的Mn符号的空位）作为Na离子电池作为新型阴极材料呈现。本机空缺的存在赋予该材料具有有吸引力的性质，包括高结构柔韧性和Na离子萃取和插入的稳定性，氧氧化还原反应的高可逆性。边缘结构和X射线光电子能谱附近的同步X射线吸收表明，电荷补偿由氧氧化还原反应和MN3 + / MN4 +氧化还原反应分别主导。原位同步X射线衍射在循环期间表现出其零应变特征。密度函数理论计算进一步加深了氧气和锰氧化还原反应对电荷补偿的理解和材料中Mn离子的不动。这些调查结果为寻找和设计具有高容量和高结构稳定性的材料来提供新的思路，可用于新颖的能量存储系统。

著录项

  • 来源
    《Advanced energy materials》 |2019年第4期|1803087.1-1803087.9|共9页
  • 作者

    Li Yejing; Wang Xuefeng; Gao Yurui; Zhang Qinghua; Tan Guoqiong; Kong Qingyu; Bak Seongmin; Lu Gang; Yang Xiao-Qing; Gu Lin; Lu Jun; Amine Khalil; Wang Zhaoxiang; Chen Liquan;

  • 作者单位

    Chinese Acad Sci Inst Phys Key Lab Renewable Energy POB 603 Beijing 100190 Peoples R China|Univ Chinese Acad Sci Sch Phys Sci POB 603 Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Phys Key Lab Renewable Energy POB 603 Beijing 100190 Peoples R China|Univ Calif San Diego Dept NanoEngn 9500 Gilman Dr La Jolla CA 92093 USA;

    Calif State Univ Northridge Dept Phys & Astron Northridge CA 91330 USA;

    Chinese Acad Sci Inst Phys Lab Adv Mat & Electron Microscopy POB 603 Beijing 100190 Peoples R China;

    Argonne Natl Lab Chem Sci & Engn Div 9700 S Cass Ave Lemont IL 60439 USA;

    Synchrotron Soleil F-91192 Gif Sur Yvette France;

    Brookhaven Natl Lab Dept Chem Upton NY 11973 USA;

    Calif State Univ Northridge Dept Phys & Astron Northridge CA 91330 USA;

    Brookhaven Natl Lab Dept Chem Upton NY 11973 USA;

    Chinese Acad Sci Inst Phys Lab Adv Mat & Electron Microscopy POB 603 Beijing 100190 Peoples R China;

    Argonne Natl Lab Chem Sci & Engn Div 9700 S Cass Ave Lemont IL 60439 USA;

    Argonne Natl Lab Chem Sci & Engn Div 9700 S Cass Ave Lemont IL 60439 USA;

    Chinese Acad Sci Inst Phys Key Lab Renewable Energy POB 603 Beijing 100190 Peoples R China|Univ Chinese Acad Sci Sch Phys Sci POB 603 Beijing 100190 Peoples R China;

    Chinese Acad Sci Inst Phys Key Lab Renewable Energy POB 603 Beijing 100190 Peoples R China|Univ Chinese Acad Sci Sch Phys Sci POB 603 Beijing 100190 Peoples R China;

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

    cathode materials; charge compensation; oxygen redox; sodium manganese oxide; zero-strain;

    机译：阴极材料;电荷补偿;氧氧化还原;氧化钠;零株;

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