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Trends in Lattice Energy: Ion Size and Charge02:54

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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在WNb12O33中受到伪约翰-泰勒效应调节的结构扭曲,触发高度稳定和快速充电的存储

Yingying Lei1, Mingru Su1, Shijie Wang1

  • 1School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, PR China.

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概括

铜剂通过提高导电性和离子传输来提高氧化物 (WNb12O33) 阳极性能. 这增加了先进的离子电池的容量和稳定性.

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科学领域:

  • 材料科学
  • 电化学
  • 固态化学

背景情况:

  • 氧化 (WNb12O33) 具有适用于高储存能力的ReO3剪切结构.
  • 电子和离子运输不佳阻碍了WNb12O33作为阳极材料的潜力.
  • 在保持结构完整的同时提高导电性对于WNb12O33阳极至关重要.

研究的目的:

  • 研究Cu2+对WNb12O33结构和电化学特性的影响.
  • 为了提高WNb12O33的电子导电性和离子传输.
  • 评估Cu2+化WNb12O33作为离子电池阳极的性能.

主要方法:

  • 通过局部结构扭曲调节策略合成Cu2+化WNb12O33.
  • 使用X射线衍射 (XRD) 分析晶体结构的特征.
  • 密度函数理论 (DFT) 计算以研究电子结构和粘合.
  • 电化学测试以评估储能,离子扩散,速率能力和循环稳定性.

主要成果:

  • XRD证实了Cu2+注后晶体结构对称性的变化.
  • DFT计算显示变化的带隙和Nb-O键长度,增强电子导电性和Li+吸附性.
  • 用Cu2+添加剂的WNb12O33具有272.6mAhg-1的高可逆特异容量.
  • 提升的Li+扩散系数为5.26 × 10-12 cm2 s-1.
  • 在循环过程中表现出显著的结构稳定性和可逆的单相过渡.
  • 在10Ag-1下实现高速容量 (147.2mAhg-1) 和卓越的循环性能 (在1000个循环后保持5Ag-1的84.3%).

结论:

  • 伪约翰-泰勒效应驱动的兴奋剂策略有效调节了WNb12O33的局部结构.
  • 2+注显著提高了WNb12O33中的电子导电性和离子传输.
  • 作为快速储能应用的高性能阳极材料,Cu0.05WNb11.95O33非常有前途.
  • 这种方法为设计和定制用于储能的剪切结构提供了新的视角.