Abstract
Among cathode materials for Li-ion batteries, LiFePO4 (LFP) is one of the most relevant for commercial batteries in electric vehicle applications. In this work, the Young’s modulus and the indentation hardness of a commercial composite LiFePO4 cathode are measured using statistical nanoindentation. The influence of the surface roughness, a substrate effect, as well as particle size effect and densification on the measurement are discussed in detail. A focus lies on the analysis of the mechanical properties of the porous secondary LiFePO4 particles and the porosity dependence of the Young’s modulus. The measurements are validated via finite element simulations on reconstructed real microstructures. It was found that the mechanical properties of the secondary LiFePO4 particles are significantly lower than those of bulk LiFePO4 and a porosity dependence of the Young’s modulus was established. The experimental Young’s modulus of the porous LiFePO4 is 47.3GPa and the indentation hardness is 2.5GPa. For porous ceramics such as these, this results in an estimation of the yield strength of 1.5GPa.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
