...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS applied materials & interfaces >On the Mechanism of the Improved Operation Voltage of Rhombohedral Nickel Hexacyanoferrate as Cathodes for Sodium-Ion Batteries
【24h】

On the Mechanism of the Improved Operation Voltage of Rhombohedral Nickel Hexacyanoferrate as Cathodes for Sodium-Ion Batteries

机译：六面体六氰基高铁酸镍作为钠离子电池阴极的工作电压提高的机理研究

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We reported a rhombohedral Na-rich nickel hexacyanoferrate (r-NiHCF) with high discharge voltage, which also possesses long cycle stability and excellent rate capability when serving as the cathode material of Na-ion batteries. First-principles calculations suggest that the high working voltage of r-NiHCF is correlated to the asymmetric residence of Na+ ions in the rhombohedral framework in parallel with the low charge density at the Fe2+ ions. In both aqueous and ether-based electrolytes, r-NiHCF exhibits higher voltage than that of cubic NiHCF. Rate and cycle experiments indicate that r-NiHCF delivers a specific capacity of 66.8 mAh g(-1) at the current density of 80 mA g(-1), which is approximate to the theoretical capacity of r-NiHCF. A capacity retention of 96% can be achieved after 200 cycles. The excellent stability of r-NiHCF can be assigned to the absence of rhombohedral cubic phase transition and negligible volume variation during electrochemical redox, as proven by the ex situ XRD patterns at different depths of charge/discharge and the DFT calculations, respectively.
机译：我们报道了具有高放电电压的菱面体富含Na的六氰合铁酸镍（r-NiHCF），当用作Na离子电池的正极材料时，它还具有长循环稳定性和出色的倍率性能。第一性原理计算表明，r-NiHCF的高工作电压与Na +离子在菱形体框架中的不对称滞留相关，同时与Fe2 +离子的低电荷密度相关。在水基和醚基电解质中，r-NiHCF的电压都高于立方NiHCF的电压。速率和循环实验表明，r-NiHCF在电流密度为80 mA g（-1）时可提供66.8 mAh g（-1）的比容量，这近似于r-NiHCF的理论容量。 200次循环后，容量保持率可达到96％。 r-NiHCF的出色稳定性可以归因于在电化学氧化还原过程中不存在菱面体立方相变和体​​积变化可忽略不计，这分别通过在不同充电/放电深度处的异位XRD图谱和DFT计算来证明。

著录项

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