Morphology Engineering in Cobalt‐Free Li‐Rich Oxides for High‐Capacity and Strain‐Tolerant Cathodes

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Abstract Morphology engineering plays a critical role in enhancing ionic diffusion kinetics and activating oxygen redox activity cobalt‐free lithium‐rich layered oxides (LROs), addressing their intrinsic limitations for high‐energy‐density batteries. Herein, morphology‐engineering strategy is proposed to synthesize LRO cathodes with radially arranged primary grains (LRO‐RA) short rod‐like (LRO‐SR). The radial architecture of LRO‐RA establishes fast Li + pathways, as evidenced by its near‐identical coefficient LRO‐SR despite dominating contributions. This accelerated ion transport facilitates reversible anionic redox, yielding 79 mAh g −1 higher initial discharge capacity (0.1C) 50.6 mV lower O oxidation potential compared LRO‐SR. Advanced spectroscopic diffraction analyses confirm that the morphology stabilizes minimizes MnO 6 distortion, mitigates strain accumulation. Consequently, achieves 94.8% retention after 400 cycles (1C), far exceeding (75.6%), mitigated voltage decay. Post‐cycling analysis confirms dense resist electrolyte infiltration phase transformation, preserving structural integrity. work elucidates how morphology‐driven optimization amplifies reversibility, offering universal design principle high‐capacity Li‐rich cathodes.

Language: Английский

Ba/Ti co-doping to improve O-redox reversibility and structural stability of Li-rich layered cathodes

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 648, P. 237352 - 237352

Published: May 23, 2025

Language: Английский