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首页> 外文期刊>Journal of materials science >Structure and electrochemical properties of acid-leached LiMn_(2-x)Ti_xO_4
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Structure and electrochemical properties of acid-leached LiMn_(2-x)Ti_xO_4

机译：酸浸LiMn_（2-x）Ti_xO_4的结构与电化学性能

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摘要

To gain deeper understanding on the relationships between crystal structure and electrochemical properties of manganese oxide electrodes for supercapacitors, acid-leached LiMn~(2 − x)Ti~(x)O~(4)were investigated. Based on both Reitveld refinement on X-ray diffraction patterns and X-ray absorption near edge structure, it is proposed that replacing some Mn with Ti not only enlarges the unit cells but also alters the crystal structure, specifically the occupancy of each element in the lattice. While the tetrahedral 8a position and octahedral 16c position are both vacant in leached MnO~(2), those in leached LiMn~(2 − x)Ti~(x)O~(4)with x > 0 are occupied by Ti and Mn, respectively. The differences in the unit cell dimension and the crystal structure affect the electrochemical behaviors of the compounds. Although the total specific capacitance generally decreases with Mn active species, trend in %C~(ins)is opposite in samples with x = 0.25–0.75. Despite having some cations in the positions which should hinder the ion diffusion, the enlarged cavity size resulting from Ti substitution promotes the diffusion process and enhances the insertion capacitance in these samples.
机译：为了深入了解超级电容器锰氧化物电极的晶体结构与电化学性能之间的关系，研究了酸浸LiMn〜（2 ^-x）Ti〜（x）O〜（4）。基于X射线衍射图的Reitveld细化和X射线在边缘结构附近的吸收，建议用Ti代替某些Mn不仅会扩大晶胞，而且会改变晶体结构，特别是改变元素的占有率。格子。浸出MnO〜（2）中四面体8a位和八面体16c位均空位，而x> 0的浸出LiMn〜（2-x）Ti〜（x）O〜（4）中的Ti和Mn占据， 分别。晶胞尺寸和晶体结构的差异影响化合物的电化学行为。尽管总的比电容通常随Mn活性物种而降低，但x = 0.25-0.75的样品中％C〜（ins）的趋势却相反。尽管在某些位置上会阻碍离子扩散的阳离子，但由于Ti取代而导致的腔尺寸增大，促进了扩散过程并增强了这些样品中的插入电容。

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