Preparation of FePO4 by liquid-phase method and modification on the surface of LiNi0.80Co0.15Al0.05O2 cathode material
Preparation of FePO4 by liquid-phase method and modification on the surface of LiNi0.80Co0.15Al0.05O2 cathode material
复制标题
液相法制备FePO4及LiNi0.80Co0.15Al0.05O2正极材料表面改性
DOI：
10.1016/j.jallcom.2017.10.047
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发表时间：
2018-01
影响因子：
6.2
通讯作者：
Hong Guo
中科院分区：
文献类型：
--
作者：
Shubiao Xia;Fushao Li;Feixiang Chen;Hong Guo
采用常规液相法制备了分布均匀、结晶度高的纳米FePO 4，并将其包覆在LiNi0.80Co0.15Al0.05O2（NCA）表面，以调节电极的界面性能。包覆前后NCA的晶体结构相对完整。FePO 4的表面改性有效地提高了NCA材料的循环稳定性和热稳定性。初始放电比容量为181 mAhg-1、180 mAhg-1、180 mAhg-1和166 mAhg-1，对应于原始和涂层含量为1重量%、2重量%和3重量%。当涂层含量为2wt%时，100次循环后容量保持率仍保持在85.82%以上。它甚至在5C下也表现出良好的速率容量性能。电化学阻抗谱分析表明，涂层降低了材料的电荷转移电阻，提高了材料的循环性能。因此，纳米FePO 4包覆的NCA电极具有更好的电化学性能。
A general liquid-phase technology is hired to prepare uniform distribution, high crystallinity nano-FePO4, which is coated on the surface of LiNi0.80Co0.15Al0.05O2(NCA) to adjust the interface property of electrode. The crystal structure of NCA is relatively complete before and after coating. Surface modification by FePO4improves the cycling and thermal stability of NCA materials effectively. The initial specific discharge capacity is 181 mAhg−1, 180 mAhg−1, 180 mAhg−1, and 166 mAhg−1, corresponding to the pristine and the coating contents of 1 wt%, 2 wt%, and 3 wt%. The capacity retention can keep over 85.82% for the sample coated content of 2 wt% after 100 cycles. It also exhibit good rate capacity performance even at 5C. The Electrochemical impedance spectroscopy (EIS) analysis reveals the charge transfer resistance is reduced by coating and the cycle performance is improved. Therefore, the NCA electrode coated with nano-FePO4shows enhanced electrochemical performance.
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通讯作者：
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