Cycle-Induced Interfacial Degradation and Transition-Metal Cross-Over in LiNi_0.8Mn_0.1Co_0.1O₂-Graphite Cells.

ABSTRACT: Ni-rich lithium nickel manganese cobalt (NMC) oxide cathode materials promise Li-ion batteries with increased energy density and lower cost. However, higher Ni content is accompanied by accelerated degradation and thus poor cycle lifetime, with the underlying mechanisms and their relative contributions still poorly understood. Here, we combine electrochemical analysis with surface-sensitive X-ray photoelectron and absorption spectroscopies to observe the interfacial degradation occurring in LiNi_0.8Mn_0.1Co_0.1O₂-graphite full cells over hundreds of cycles between fixed cell voltages (2.5-4.2 V). Capacity losses during the first ∼200 cycles are primarily attributable to a loss of active lithium through electrolyte reduction on the graphite anode, se

SUBMITTER: Bjorklund E 

PROVIDER: S-EPMC9082506 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature