Research Highlight | Center for Nanoscale Materials
Single-crystal battery materials: redefining strain and stability
In a study published in Nature Nanotechnology, researchers uncovered how strain evolves in single-crystal Ni-rich battery electrodes, refining cobalt and manganese roles. This breakthrough paves the way for durable, high-performance lithium-ion batteries.
Schematic of the mechanism of chemomechanical evolutions for cobalt (top) and manganese (bottom) single-crystal Ni-rich Li metal coin cells during electrochemical cycling. The black circle indicates the kinetically hindered zones. The region between the red and black circles schematically shows the presence of a self-accelerating delithiation reaction.
Scientific Achievement
This research decouples mechanical stability from lattice volume changes in single-crystal Ni-rich layered oxides (SC-NMC ) and identifies reaction heterogeneity as the primary driver of strain and mechanical degradation.
Significance and Impact
The findings redefine strain indicators and compositional strategies, enabling design of more durable and efficient lithium-ion batteries for applications in transportation and energy storage.
Research Details
- Scanning diffraction X-ray microscopy (SDXM) was conducted using Hard X-ray Nanoprobe (HXN) at CNM to probe nanoscopic strain evolution.
- Spectra 200 and Talos at CNM were utilized for atomic-scale analysis of localized structural and mechanical degradation.