Enhancing the Electrochemical Performance of Ni-Rich LiNi0.88Co0.09Al0.03O2 Cathodes through Tungsten-Doping for Lithium-Ion Batteries

Abstract

The tungsten-doped (0.5 and 1.0 mol%) LiNi0.88Co0.09Al0.03O2 (NCA) cathode materials are manufactured to systematically examine the stabilizing effect of W-doping. The 1.0 mol% W-doped LiNi0.88Co0.09Al0.03O2 (W1.0-NCA) cathodes deliver 173.5 mAh g−1 even after 100 cycles at 1 C, which is 95.2% of the initial capacity. While the capacity retention of NCA cathodes cycled in identical conditions is 86.3%. The optimal performances of the W1.0-NCA could be ascribed to the suppression of impendence increase and the decrease in anisotropic volume change, as well as preventing the collapse of structures during cycling. These findings demonstrate that the W-doping considerably enhances the electrochemical performance of NCA, which has potential applications in the development of Ni-rich layered cathode materials that can display high capacity with superior cycling stability.

Ageing of High Energy Density Automotive Li-Ion Batteries: The Effect of Temperature and State-of-Charge

“…W doping of NCA is known to increase electronic and ionic conductivity, decrease cation mixing, and mitigate particle cracking. 50 The negative electrode consisted of graphite with SiO x particles, which had a coating or interphase layer with a thickness up to 100 nm. The use of SiO x chemistry in the negative electrode has been found to improve its specific capacity and lower degradation compared to pure Si.…”

The role of niobium in layered oxide cathodes for conventional lithium-ion and solid-state batteries

“…21 These characteristics translate to an observed reduction in degradation and improvements to lithium diffusion kinetics when Nb 5+ is employed as a dopant. Other element dopants with comparable ionic radius and higher valence than the TMs in LTMOs, such as V 5+ , 22–24 Ta 5+ , 25–27 Mo 6+ , 28–30 and W 6+ , 31–33 have also been reported to exhibit similar improvements. Another work has outlined the impact of these and various other dopants and coating materials on Ni-rich CAMs.…”

Low-cobalt active cathode materials for high-performance lithium-ion batteries: synthesis and performance enhancement methods

“…147 Various cations, such as Na + , K + , Mg 2+ , Al 3+ , Nb 5+ , V + , W 6+ , Mo 6+ , Zr 4+ , Si 4+ , etc., are successfully doped into the crystal moiety of high Ni-NCMs/NCAs to improve the structural stability, conductivity and electrochemical performance. [148][149][150][151][152][153][154] Shen et al have doped Ni 0.6 Co 0.05 Mn 0.35 O 2 with varying amounts of Na + and K + (1-3%) and evaluated the electrochemical performance. 36 It was observed that 2% Na + and 1% K + doping could efficiently improve the performance individually.…”