• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced energy materials >A Tale of Two Sites: On Defining the Carrier Concentration in Garnet-Based Ionic Conductors for Advanced Li Batteries
【24h】

A Tale of Two Sites: On Defining the Carrier Concentration in Garnet-Based Ionic Conductors for Advanced Li Batteries

机译：两个地点的故事：关于定义高级锂电池的石榴石离子导体中的载流子浓度

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

Solid electrolytes based on the garnet crystal structure have recently been identified as a promising material to enable advance Li battery cell chemistries because of the unprecedented combination of high ionic conductivity and electrochemical stability against metallic Li. To better understand the mechanisms that give rise to high conductivity, the goal of this work is to correlate Li site occupancy with Li-ion transport. Toward this goal, the Li site occupancy is studied in cubic garnet as a function of Li concentration over the compositions range: Li7−xLa3Zr2−xTaxO12 (x = 0.5, 0.75, and 1.5). The distribution of Li between the two interstitial sites (24d and 96h) is determined using neutron and synchrotron diffraction. The bulk conductivity is measured on >97% relative density polycrystalline specimens to correlate Li-ion transport as a function of Li site occupancy. It is determined that the conductivity changes nonlinearly with the occupancy of the octahedral (96h) Li site. It is shown that the effective carrier concentration is dependent on the Li site occupancy and suggests that this is a consequence of significant carrier–carrier coulombic interactions. Furthermore, the observation of maximum conductivity near Li = 6.5 mol is explained.
机译：最近，基于石榴石晶体结构的固体电解质由于具有高离子电导率和对金属Li的电化学稳定性的空前组合，已被认为是有望实现先进的锂电池化学的材料。为了更好地理解引起高电导率的机制，这项工作的目标是将锂的位置占有率与锂离子的运输联系起来。为了实现这一目标，研究了在立方石榴石中Li的位置占有率与Li浓度在以下组成范围内的关系：Li7-xLa3Zr2-xTaxO12（x = 0.5、0.75和1.5）。使用中子和同步加速器衍射确定两个间隙位置（24d和96h）之间Li的分布。在> 97％相对密度的多晶样品上测量整体电导率，以将锂离子的运输与锂位点占有率相关联。可以确定，电导率随八面体（96h）Li位置的占有率非线性变化。结果表明，有效载流子浓度取决于Li位点的占有率，并表明这是重要的载流子-载流子库仑相互作用的结果。此外，解释了在Li = 6.5 mol附近观察到的最大电导率。

著录项

  • 来源
    《Advanced energy materials》 |2015年第11期|1-9|共9页
  • 作者

    Travis Thompson; Asma Sharafi; Michelle D. Johannes; Ashfia Huq; Jan L. Allen; Jeff Wolfenstine; Jeff Sakamoto;

  • 作者单位

    Department of Mechanical EngineeringUniversity of Michigan 2350 Hayward Ave GG Brown Laboratory Ann Arbor MI USA;

    Department of Mechanical EngineeringUniversity of Michigan 2350 Hayward Ave GG Brown Laboratory Ann Arbor MI USA;

    Center for Computational Materials Science Naval Research Laboratory Anacostia VA USA;

    Spallation Neutron Source Bear Creek Rd Oak Ridge National Laboratory Oak Ridge TN USA;

    RDRL-SED-C Army Research Laboratory Adelphi MD USA;

    RDRL-SED-C Army Research Laboratory Adelphi MD USA;

    Department of Mechanical EngineeringUniversity of Michigan 2350 Hayward Ave GG Brown Laboratory Ann Arbor MI USA;

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

    batteries; garnet; ionic conductivity; neutron diffraction; solid electrolytes;

    机译：电池;石榴石;离子电导率;中子衍射;固体电解质;

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