Demonstrating Apparently Inconspicuous but Sensitive Impacts on the Rollover Failure of Lithium-Ion Batteries at a High Voltage

• DOI: 10.1021/acsami.1c17408
• Publication Date: 2021-11-24T00:43:45Z
• Authors: Sven Klein; Peer Bärmann; Lukas Stolz; Kristina Borzutzki; Jan-Patrick Schmi...; Markus Börner; Martin Winter; Tobias Placke; Johannes Kasnatsc...
• Keywords: Rollover (web design); Catastrophic failure

Layered oxides, such as Li[Ni0.5Co0.2Mn0.3]O2 (NCM523), are promising cathode materials for operation at a high voltage, i.e., high-energy lithium-ion batteries. The instability-reasoned transition metal dissolution remains major challenge, which initiates electrode cross-talk, alteration of the solid electrolyte interphase, and enhanced Li-metal dendrite formation graphite anode, consequently leading to rollover failure. In this work, relevant impacts on failure mechanism highlighted. For example, conventional coating NCM523 with aluminum oxide typical high-voltage modification improves kinetic aspects but can only postpone later charge/discharge cycles. Interestingly, similar effect is observed merely after cell protocol, first Further influences specific test protocols highlighted show that even disappears C-rates above 2C, be attributed more homogeneous distribution formation. It worth noting variation anode porosity reveal effects, as, e.g., variations in processing also impact Li appearance Overall, valid complex phenomenon, sensitively depends apparently inconspicuous parameters should not disregarded.