钠离子电池层状氧化物正极：层间滑移，相变与性能

刘欢庆, 高旭, 陈军, 尹首懿, 邹康宇, 徐来强, 邹国强, 侯红帅, 纪效波

Layered oxide cathode for sodium ion batteries: Interlayer glide, phase transition and performance

Huanqing LIU, Xu GAO, Jun CHEN, Shouyi YIN, Kangyu ZOU, Laiqiang XU, Guoqiang ZOU, Hongshuai HOU, Xiaobo JI

图4 (a) P2-Na_2/3Ni_1/3Mn_2/3O₂电极的充放电曲线^[57]；(b) Na_2/3Fe_1/2Mn_1/2O₂ and Na_2/3Mn_0.65Ni_0.15Fe_0.2O₂的相变与循环中钠含量的关系。*表示循环的起点^[58]；(c) 充电至3.8和4.2 V的P2型Na_xFe_1/2Mn_1/2O₂样品的XRD图^[44]；(d) “ Z”相的相变机制^[59]

Fig.4 (a) the charge/discharge curves of P2-Na_2/3Ni_1/3Mn_2/3O₂ electrode^[57]; (b) phase evolution of Na_2/3Fe_1/2Mn_1/2O₂ and Na_2/3 Mn_0.65Ni_0.15Fe_0.2O₂ as a function of the sodium content during first cycle. The sign * shows the starting point of cycling^[58]; (c) XRD patterns of P2-type Na_xFe_1/2Mn_1/2O₂ samples charged to 3.8 and 4.2 V^[44]; (d) the phase transformation mechanism for the “Z”phase^[59]