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首页> 外文期刊>Journal of power sources >Part-II: Exchange current density and ionic diffusivity studies on the ordered and disordered spinel LiNi0.5Mn1.5O4 cathode
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Part-II: Exchange current density and ionic diffusivity studies on the ordered and disordered spinel LiNi0.5Mn1.5O4 cathode

机译：第二部分：有序和无序尖晶石LiNi0.5Mn1.5O4阴极的交换电流密度和离子扩散率研究

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摘要

Additive-free pellets of Li1-xNi0.5Mn1.5O4 have been prepared for the purpose of performing ionic diffusivity and exchange current density studies. Here we report on the characterization of interfacial charge transfer kinetics and ionic diffusivity of ordered (P4(3)32) and disordered (Fd (3) over barm)Li1-xNi0.5Mn1.5O4 as a function of lithium content at ambient temperature. The exchange current density at the electrode/ electrolyte interface is found to be continuously increased with increasing the degree of delithiation for ordered phase (similar to 0.21-6.5 mA/cm(2)) at (x = 0.01-0.60), in contrast the disordered phase exhibits gradually decrease of exchange current density in the initial delithiation at the 4 V plateau regime (x = 0.01 -0.04) and again monotonously increases (0.65-6.8 mA/cm(2)) with further delithiation at (x = 0.04 -0.60). The ionic diffusivity of ordered and disordered phase is found to be similar to 5 x 10(-10) cm(2)s(-1) and similar to 10(-9) cm(2)s(-1), respectively, and does not vary much with the degree of delithiation. From the obtained results it appears that the chemical diffusivity during electrochemical use is limited by lithium transport, but is fast enough over the entire state-of-charge range to allow charge/discharge of micron-scale particles at practical C-rates. (C) 2017 Elsevier B.V. All rights reserved.
机译：为了进行离子扩散性和交换电流密度研究，已经制备了Li1-xNi0.5Mn1.5O4的无添加剂颗粒。在这里，我们报告在环境温度下有序的（P4（3）32）和无序的（Fd（3）在barm上）Li1-xNi0.5Mn1.5O4的界面电荷转移动力学和离子扩散系数的表征。发现在电极/电解质界面处的交换电流密度随着（x = 0.01-0.60）有序相的脱锂度的增加而连续增加（类似于0.21-6.5 mA / cm（2））。无序相在4 V平台状态（x = 0.01 -0.04）的初始脱锂过程中表现出逐渐减小的交换电流密度，并再次单调增加（0.65-6.8 mA / cm（2）），在（x = 0.04- 0.60）。发现有序和无序相的离子扩散率分别类似于5 x 10（-10）cm（2）s（-1）和10（-9）cm（2）s（-1），并且随去磁度的变化不大。从获得的结果来看，似乎在电化学使用期间的化学扩散率受到锂传输的限制，但是在整个电荷状态范围内足够快，以允许以实际的C速率对微米级颗粒进行充电/放电。 （C）2017 Elsevier B.V.保留所有权利。

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