Accelerated aging and degradation mechanism of LiFePO₄/graphite batteries cycled at high discharge rates.

ABSTRACT: The effects of discharge rates (0.5C, 1.0C, 2.0C, 3.0C, 4.0C and 5.0C) on the aging of LiFePO₄/graphite full cells are researched by disassembling the fresh and aged full cells. The capacity degradation mechanism is analyzed via electrochemical performance, surface morphologies and compositions, and the structure of the anode and cathode electrodes. The capacity fade is accelerated with increasing discharge rates. The irreversible loss of active lithium due to the generation of an SEI film is the primary aging factor for the full cells cycled at low discharge rates. However, when the discharge rate is greater than or equal to 4.0C, the performance degradation of the LiFePO₄ electrode is distinct due to structure decay, which is caused by quick and repeated inte

SUBMITTER: Sun S 

PROVIDER: S-EPMC9082553 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature