材料科学
电化学
粒径
X射线光电子能谱
锂(药物)
锂离子电池
离子
极化(电化学)
阴极
镍
冶金
化学工程
粒子(生态学)
电池(电)
物理化学
电极
热力学
功率(物理)
内分泌学
有机化学
化学
工程类
地质学
物理
海洋学
医学
作者
Maolin Zhang,Jiangtao Shen,Jing Li,Dongyan Zhang,Yangxi Yan,Yunxia Huang,Zhimin Li
标识
DOI:10.1016/j.ceramint.2019.10.195
摘要
Particle size plays an important role in the electrochemical properties of cathode materials for lithium-ion battery, and the sizes of cathode powders are often designed to specific scales to obtain desired rate capacity, cyclic stability, etc. Nano-sized or micron-sized primary/secondary particles were both reported to be helpful to heighten the electrochemical properties of the same material system. However, the relationship between particle size and electrochemical properties of Ni-rich LiNi0.8Co0.1Mn0.1O2 (NCM-811) has not been discussed in detail. Here, we prepared the pristine NCM-811 powders with various micro-sized particles by using solid state reaction, and investigated the influence of particle size on the electrochemical properties of typical NCM-811 cathode material, to clarify the importance of size effect. The result indicates that pristine NCM-811 cathode powders with D50 = 7.7 μm displayed the best initial discharge specific capacity (224.5 and 169.1 mA h/g at 1/20 C and 1 C rate, respectively) and retention capacity (71.0% at 1 C rate) after 100th cycling at room temperature. The mutual acting mechanism in terms of layered structure, cation mixing degree, polarization state, charge-transfer resistance, and the diffusion ability of lithium-ion was confirmed by XRD, XPS, CV and EIS analyses, respectively.
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