High capacity sodium-rich layered oxide cathode for sodium-ion batteries
Guo Gen-Cai, Wang Changhao, Ming Bang-Ming, Luo Si-Wei, Su Heng, Wang Bo-Ya, Zhang Ming, Yu Hai-Jun, Wang Ru-Zhi
       

(color online) (a) The diffusion path of Na+ in the Na layer (path I–IV, represented by blue arrow) and between Na layer and Mn layer (path V–VI, represented by green arrow); (b) diffusion barrier of Na+ migration in the Na layer (path I–IV, represented by green line) and between Na layer and Mn layer (path V–VI, represented by blue line).