Surface regulation enables high stability of single-crystal lithium-ion cathodes at high voltage.

ABSTRACT: Single-crystal cathode materials for lithium-ion batteries have attracted increasing interest in providing greater capacity retention than their polycrystalline counterparts. However, after being cycled at high voltages, these single-crystal materials exhibit severe structural instability and capacity fade. Understanding how the surface structural changes determine the performance degradation over cycling is crucial, but remains elusive. Here, we investigate the correlation of the surface structure, internal strain, and capacity deterioration by using operando X-ray spectroscopy imaging and nano-tomography. We directly observe a close correlation between surface chemistry and phase distribution from homogeneity to heterogeneity, which induces heterogeneous internal strain within the partic

SUBMITTER: Zhang F 

PROVIDER: S-EPMC7298058 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature