Inhibition of P3‒O3 phase transition via local symmetry tuning in P3-type layered cathodes for ultra-stable sodium storage Ya-Nan Zhou, Zichun Xiao, Duzhao Han, Suning Wang, Jinniu Chen, Wei Tang, Mingyu Yang, Le Shao, Chengyong Shu, Weibo Hua, Dezhong Zhou and Yuping Wu Abstract Sodium-deficient layered oxide cathode materials such as P3-type Na2/3Ni1/3Mn2/3O2 (P3-NaNM) usually suffer from different kinds of Na+/vacancy ordering and phase transitions upon Na+ extraction/insertion, which...