Boosting the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode materials in-situ modified with Li1.3Al0.3Ti1.7(PO4)3 fast ion conductor for lithium-ion batteries
Boosting the electrochemical performance of LiNi0.8Co0.15Al0.05O2 cathode materials in-situ modified with Li1.3Al0.3Ti1.7(PO4)3 fast ion conductor for lithium-ion batteries
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Li1.3Al0.3Ti1.7(PO4)3快离子导体原位改性LiNi0.8Co0.15Al0.05O2正极材料提高锂离子电池电化学性能
DOI：
10.1016/j.electacta.2020.136477
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发表时间：
2020-09-01
影响因子：
6.6
通讯作者：
Wang, Changjun
中科院分区：
文献类型：
--
作者：
Nie, Yan;Xiao, Wei;Wang, Changjun
采用Li1.3Al0.3Ti1.7（PO 4）（3）（LATP）快离子导体粉末原位改性，制备了结构稳定的LiNi0.8Co0.15Al0.05O2（NCA）材料，并用X射线衍射仪、扫描电镜、透射电镜、能谱仪和X射线光电子能谱仪对其进行了表征。结果表明，当LATP前驱体与NCA前驱体的最佳掺杂比例为1.0wt%时，NCA-1.0颗粒表面均匀包覆有厚度约200 nm的LATP包覆层，Li层中Ni 2+离子的含量为1.58%。用NCA-1.0组装的纽扣电池在2C下150次循环后的放电比容量为152.4mAh g（-1），容量保持率为89.5%，5C下的倍率容量为153.2mAh g（-1），Li+扩散系数为6.65 × 10（-10）cm（2）s（-1）。这些优异的电化学性能可归因于所形成的LATP涂层和Ti 4+掺杂的协同效应，表明原位改性方法是提高锂离子电池富Ni材料电化学性能的一种有前途的途径。(c)2020爱思唯尔有限公司保留所有权利。
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 x 10(-10) cm(2) 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. (c) 2020 Elsevier Ltd. All rights reserved.