Prediction Clue on the Fading Capacity of Multi-Walled Carbon Nanotube-Decorated Li 2 (Fe 1– x Ti x )SiO 4 /C High-Performance Cathode Materials

作者：Sivaraj Pazhaniswamy, Abhilash Karuthedath Parameswaran, B. Nalini, Sunkulp Goel, Zdeněk Sofer, Sudheer Kumar Yadav, Christopher Selvin Panneerselvam · 发表于：Energy & Fuels · 年份：2021 · DOI：10.1021/acs.energyfuels.1c00269 · 被引用次数：21 · 研究领域：Advancements in Battery Materials、Advanced Battery Technologies Research、Advanced Battery Materials and Technologies

The key challenges of Li 2 FeSiO 4 are poor conductivity, low Li-ion diffusion, and extreme capacity fading during the charge–discharge process. In this research, a new attempt has been made to combine three key strategies: carbon coating, cation (Ti 4+ ) doping, and the incorporation of multi-walled carbon nanotubes (MWCNTs) to address major electrochemical impediments in the Li 2 FeSiO 4 cathode material. The field emission-scanning electron microscopy and high-resolution transmission electron microscopy analyses demonstrated the homogeneous distribution of spherical Li 2 Fe 0.94 Ti 0.06 SiO 4 /C nanoparticles entangled in the MWCNT framework. The 5 wt % MWCNT-integrated Li 2 Fe 0.94 Ti 0.06 SiO 4 /C composite cathode offers an excellent initial specific charge capacity of 240 mA h g –1 and the discharge capacity of 238 mA h g –1, which are higher than those of the bare Li 2 FeSiO 4 /C. The sample exhibits an excellent rate capability (124 mA h g –1 @15 C) and a good long-term cycle life up to 1000 cycles. The Ti doping at the Fe site of Li 2 FeSiO 4 /C prohibits the structural distortion during the charge and discharge processes. The surface charge-transfer performance has improved via carbon coating and incorporation of MWCNTs into the Ti-doped Li 2 FeSiO 4 /C nanoparticles. To date, the results of the research have been very enlightening, especially in terms of the rate capability and stability of cycling.