• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >CeO2-modified P2-Na-Co-Mn-O cathode with enhanced sodium storage characteristics
【24h】

CeO2-modified P2-Na-Co-Mn-O cathode with enhanced sodium storage characteristics

机译：CEO2改性P2-NA-CO-MN-O阴极，具有增强的钠储存特性

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

To improve the cycling stability and dynamic properties of layered oxide cathodes for sodium-ion batteries, surface modified P2-Na0.67Co0.25Mn0.75O2 with different levels of CeO2 was successfully synthesized by the solid-state method. X-ray photoelectron spectra, X-ray diffraction and Raman spectra show that the P2-structure and the oxidation state of cobalt and manganese of the pristine oxide are not affected by CeO2 surface modification, and a small amount of Ce4+ ions have been reduced to Ce3+ ions, and a few Ce ions have entered the crystal lattice of the P2-oxide surface during modification with CeO2. In a voltage range of 2.0-4.0 V at a current density of 20 mA g(-1), 2.00 wt% CeO2-modified Na0.67Co0.25Mn0.75O2 delivers a maximum discharge capacity of 135.93 mA h g(-1), and the capacity retentions are 91.96% and 83.38% after 50 and 100 cycles, respectively. However, the pristine oxide presents a low discharge capacity of 116.14 mA h g(-1), and very low retentions of 39.83% and 25.96% after 50 and 100 cycles, respectively. It is suggested that the CeO2 modification enhances not only the maximum discharge capacity, but also the electric conductivity and the sodium ion diffusivity, resulting in a significant enhancement of the cycling stability and the kinetic characteristics of the P2-type oxide cathode.
机译：为了改善钠离子电池的层状氧化物阴极的循环稳定性和动态性能，通过固态方法成功地合成了具有不同CeO 2的表面改性的P2-Na0.67Co0.25mN0.75O2。 X射线光电子体光谱，X射线衍射和拉曼光谱表明，P2结构和丙醇的氧化锰和初步氧化锰的氧化态不受CEO2表面改性的影响，并且少量CE4 +离子已经减少到Ce3 +离子和几个Ce离子在用CeO 2改性期间进入了P2氧化物表面的晶格。在电流密度为20mA g（-1）的电压范围内，2.00wt％CeO2改性的Na0.67Co0.25Mn0.75O2提供135.93 mA Hg（-1）的最大放电容量，在50和100个循环分别在50和100次循环后，容量保持率为91.96％和83.38％。然而，原始氧化物的低放电容量为116.14mA H（-1），分别在50和100次循环后的39.83％和25.96％的非常低的存活率。建议，CEO2改性不仅增强了最大放电容量，还可以增强导电性和钠离子扩散率，导致循环稳定性和P2型氧化物阴极的动力学特性显着提高。

著录项

  • 来源
    《RSC Advances》 |2018年第43期|共11页
  • 作者

    Wang Yanzhi; Tang Jiantao;

  • 作者单位

    Yanshan Univ Hebei Key Lab Appl Chem Coll Environm &

    Chem Engn Qinhuangdao 066004 Hebei Peoples R China;

    Yanshan Univ Hebei Key Lab Appl Chem Coll Environm &

    Chem Engn Qinhuangdao 066004 Hebei Peoples R China;

  • 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