材料科学
锂(药物)
X射线光电子能谱
透射电子显微镜
扫描电子显微镜
离子
电化学
法拉第效率
阴极
化学工程
电极
涂层
分析化学(期刊)
纳米技术
化学
复合材料
色谱法
物理化学
有机化学
医学
工程类
内分泌学
作者
Yan Nie,Wei Xiao,Miao Chang,Rui Fang,Zhiyan Kou,Ding Wang,Mingbiao Xu,Changjun Wang
标识
DOI:10.1016/j.electacta.2020.136477
摘要
In-situ modification with Li1.3Al0.3Ti1.7(PO4)3 (LATP) fast ion conductor powders is introduced to construct the stable structure of LiNi0.8Co0.15Al0.05O2 (NCA) materials, which are characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, energy disperse spectroscope and X-ray photoelectron spectroscope. The results demonstrate that the particle surface of NCA-1.0 is homogeneously wrapped by a LATP coating layer with a thickness of about 200 nm and the value of Ni2+ ions in the Li layer is 1.58% when the optimal doping proportion of the LATP precursor to the NCA precursor is about 1.0 wt %. The coin cell assembled with NCA-1.0 delivers a remarkable discharge specific capacity of 152.4 mAh g−1 with a capacity retention ratio of 89.5% at 2 C after 150 cycles, a favorable rate capacity of 153.2 mAh g−1 at 5 C, and an increased Li+ diffusion coefficient of 6.65 × 10−10 cm2 s−1. Those outstanding electrochemical properties can be attributed to the synergistic effects of the formed LATP coating and Ti4+ doping, indicating that the in-situ modification way is a promising route to enhance the electrochemical properties of Ni-rich materials for lithium-ion batteries.
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