Improving the Electrochemical Performance of a Series of Electrospun LiNi1/3-xCo1/3Mn1/3+xO2 Samples
首发时间:2016-03-10
Abstract:A series of LiNi1/3-xCo1/3Mn1/3+xO2(x=0, 1/18, 1/15, and 1/12) cathode materials was successfully synthesized via electrospinning. The samples were characterized using X-ray diffraction, scanning electron microscopy, and electrical conductivity measurements. In addition, 2025-type coin cells containing LiNi1/3-xCo1/3Mn1/3+xO2 cathode materials were characterized using cyclic voltammetry and galvanostatic charge/discharge measurements. The Ni-Mn content (x) significantly affected the electrochemical properties of the electrospun samples, although electrospinning did not alter the samples' micromorphologies. The specific capacities, rate performances, cycle stabilities, and conductivities of the LiNi1/3-xCo1/3Mn1/3+xO2(0≤x≤1/15) samples increased with increasing x. The cation mixing of LiNi1/3-xCo1/3Mn1/3+xO2(0≤x≤1/15) was reduced when the Ni content decreased, indicating that the structural stability was enhanced. When x was increased further, the electrochemical performance of LiNi0.25Co0.33Mn0.42O2 was attenuated. The excess x value (x=1/12) in LiNi1/3-xCo1/3Mn1/3+xO2 prepared by electrospinning debases the structure stability possibly.
keywords: LiNi1/3-xCo1/3Mn1/3+xO2 Electrospinning Electrochemical performance
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提高静电纺丝制备一系列LiNi1/3-xCo1/3Mn1/3+xO2样品的电化学性能的方法
摘要:本文采用静电纺丝的方法成功合成了一系列镍钴锰酸锂正极材料 LiNi1/3-xCo1/3Mn1/3+xO2(x=0,1/18,1/15,1/12)。通过X射线衍射(XRD)、扫描电子显微镜(SEM)以及电导率测试对样品的结构和形貌等进行了一系列的表征。此外,通过循环伏安(CV)和电化学工作站对制备出的电池也进行了一系列电化学性能测试。实验证明,虽然静电纺丝并没有改变热处理后的样品的形貌,但是镍和锰的含量还是明显影响了静电纺丝制备出的电极的电化学性能。当0≤x≤1/15时,LiNi1/3-xCo1/3Mn1/3+xO2样品的比容量、倍率性能以及电导率随着x值的增加而增加。随着镍含量的减少,锰含量的增加,LiNi1/3-xCo1/3Mn1/3+xO2(0≤x≤1/15)的阳离子混排减少了,从而增强了结构的稳定性。当x值进一步增加到1/12时,LiNi0.25Co0.33Mn0.42O2的电化学性能衰减了,可能是由于过量的X值会导致样品结构的稳定性下降造成的。
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提高静电纺丝制备一系列LiNi1/3-xCo1/3Mn1/3+xO2样品的电化学性能的方法
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