Revealing unusual storage failure of single-crystal high-nickel cathodes during high-temperature and high-humidity exposure.

This work investigates an unusual storage failure in single-crystal high-nickel cathode materials under a simulated hot and humid environment. A transient passivation effect was observed during short-term exposure, followed by rapid performance deterioration and structural/chemical state transformations upon prolonged storage. The findings highlight the need for targeted ambient storage control and material modification strategies.