Abstract:
The pristine LiNi0.8Mn0.1Co0.1O2 and the doped (Ti, Nb) LiNi0.8-xCo0.1Mn0.1O2 (x = 0.01, 0.1and 0.2), as efficient and stable cathode materials for batteries, have been synthesized for the very first-time through CHFS. This work reports a strategy (doping) to stabilize the structure of LiNi0.8Co0.1Mn0.1O2 materials. XRD analysis exhibited that heat treatment at 850 ºC for 12 h using 3X (1.6 g / 2 g NMC powder) lithium content is the optimized conditions to get the most stable structure. Furthermore, the introduction of dopants into the host structure has notably enhanced the structural and cycling stability of the cathode material. The dopant's effect on the structural and electrochemical properties of the material was studied via a number of techniques, including XRD, EDX, SEM, CV and charge/discharge studies. The pristine NMC material showed very low discharge capacity (~130 mAh g-1), which decreased rapidly on cycling owing to structural deterioration, unexpected side reactions and cation mixing. However, increasing the dopant's fraction in the cathode material delivered higher discharge capacities along with enhanced cycling stabilities. The dopants exhibited the discharge capacities in the order: 2 % Nb5+ (180 mAh g-1) ? 0.1 % Ti4+ (130 mAh g-1). Importantly, Nb5+ was electrochemically active and improved the electrochemical performance by mitigating the electrode polarization and increasing the lithium ion diffusion pathways. Contrary to this, Ti4+ doped NMC materials delivered less discharge capacities. Here, the opposing effect is attributed to the electrochemically inert nature of Ti4+, improving only the stability of the material. In general, dopants played their role in enhancing the performance of cathode material depending upon their structural effects. It is highly expected that this work will provide a general approach to improve the electrochemical properties of cathode materials for Li-ion batteries.
Page(s):
0-0
DOI:
DOI not available
Published:
Journal: First International Conference on Revamped Scientific Outlook of 21st Century (Abstract Book), Volume: 0, Issue: 0, Year: 2022