Li Jun, Huang Si, Xu Shuaijun, Lan Lifang, Lu Lu, Li Shaofang
Faculty of Chemical Engineering and Light Industry,, Guangdong University of Technology, No. 100 Waihuan xi Road, Guangzhou Higher Education Mega Center, Panyu District, Guangzhou, Guangdong, 510006, China.
Nanoscale Res Lett. 2017 Oct 30;12(1):576. doi: 10.1186/s11671-017-2342-z.
ᅟ: Ag-coated spherical LiTiO composite was successfully synthesized via a sol-gel-assisted hydrothermal method using an ethylene glycol and silver nitrate mixture as the precursor, and the influence of the Ag coating contents on the electrochemical properties of its was extensively investigated. X-ray diffraction (XRD) analysis indicated that the Ag coating does not change the spinel structure of LiTiO. The electrochemical impedance spectroscopy (EIS) analyses demonstrated that the excellent electrical conductivity of the LiTiO/Ag resulted from the presence of the highly conducting silver coating layer. Additionally, the nano-thick silver layer, which was uniformly coated on the particles, significantly improved this material's rate capability. As a consequence, the silver-coated micron-sized spherial LiTiO exhibited excellent electrochemical performance. Thus, with an appropriate silver content of 5 wt.%, the LiTiO/Ag delivered the highest capacity of 186.34 mAh g at 0.5C, which is higher than that of other samples, and maintained 92.69% of its initial capacity at 5C after 100 cycles. Even at 10C after 100 cycles, it still had a capacity retention of 89.17%, demonstrating remarkable cycling stability.
ISRCTN NARL-D-17-00568.
采用乙二醇和硝酸银混合物作为前驱体，通过溶胶 - 凝胶辅助水热法成功合成了Ag包覆的球形LiTiO复合材料，并广泛研究了Ag包覆量对其电化学性能的影响。X射线衍射（XRD）分析表明，Ag包覆并未改变LiTiO的尖晶石结构。电化学阻抗谱（EIS）分析表明，LiTiO/Ag优异的电导率源于高导电银包覆层的存在。此外，均匀包覆在颗粒上的纳米厚银层显著提高了该材料的倍率性能。因此，Ag包覆的微米级球形LiTiO表现出优异的电化学性能。因此，当Ag含量为5 wt.%时，LiTiO/Ag在0.5C下具有最高容量186.34 mAh g，高于其他样品，并且在5C下100次循环后保持其初始容量的92.69%。即使在10C下100次循环后，其容量保持率仍为89.17%，显示出卓越的循环稳定性。
ISRCTN NARL-D-17-00568。
