Work

Investigating the effect of spark plasma sintering temperature and post-sintering annealing in LiNi0.5Mn1.5O4 for its ideal design towards practical battery applications

Year: 2025

Type: article

Abstract: In this work, the effect of spark plasma sintering (SPS) and post-annealing in pure Ar and O 2 on structure, ac/dc-conductivity, impedance, and electronic properties of LiNi 0.5 Mn 1.5 O 4 (LNMO) are investigated, which establish a roadmap for the design of an ideal compound. Structural analysis using XRD reveals that the unit cell volume increases with SPS temperature and post-annealing in Ar and decreases in O 2 due to a reduction in oxygen vacancies . The dc-conductivity shows the dominance of SPH conduction up to 200 K, while Mott-VRH conduction prevails until 168 K. Frequency dispersion modeling of ac-conductivity (σ ac ) with modified JPL supports the NSPT model, and scaling of σ ac follows the modified Summerfield model. In addition, DRT clearly distinguishes grain, grain boundary, interfacial, and electrode contributions and shows that post-annealing in Ar(O 2 ) can be effectively used to increase(decrease) the grain and grain boundary resistance, which can be utilized to design and property-tune LNMO for practical applications.

Source: Journal of the European Ceramic Society

DOI: 10.1016/j.jeurceramsoc.2025.117524

Authors: Jon G. Bell, Rishabh Shukla, Shangxiong Huangfu, Michael Stuer

Institution: Swiss Federal Laboratories for Materials Science and Technology

Language: English

Topic: Advancements in Battery Materials

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $3,900