钾离子电池锰基层状氧化物正极的研究进展

韩文哲, 赖青松, 高宣雯, 骆文彬

Advances toward manganese-based layered oxide cathodes for potassium-ion batteries

Wenzhe HAN, Qingsong LAI, Xuanwen GAO, Wenbin LUO

图6 (a) Rb和Mg元素取代对晶体结构影响的示意图；(b) P3型和O3型层状结构沿TM层 c 轴方向的结构示意图；(c) K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ 粉末以及用其组装电池但未开始循环时的HRTEM图；(d) K_0.45MnO₂ 和K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ 在1.5～3.9 V电压范围、70 mA/g电流密度下的电压曲线及对应的原位XRD图谱；(e) 通过原位XRD图谱计算的K_0.45MnO₂ 和K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ 的晶格参数；(f) K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ 在20 mA/g下的GITT结果，以及相应的 D_K+；(g) K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ 在200 mA/g下的循环性能^[69]

Fig. 6 (a) Schematic diagram of the effect of Rb and Mg substitution on the crystal structure; (b) The stacking of P3-type and O3-type layered structures along the c-axis direction of the TM slabs; (c) Representative HRTEM images of the K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ powder and K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ test cathode placed in the battery environment without cycling; (d) The voltage curves and representative corresponding in situ XRD patterns of K_0.45MnO₂ and K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ at 70 mA/g in the range of 1.5—3.9 V.; (e) The c-lattice parameter of K_0.45MnO₂ and K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ calculated from in situ XRD patterns; (f) Charge GITT result of K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ at 20 mA/g, and the corresponding D_K+; (g) Cycling performance of K_0.45Rb_0.05Mn_0.85Mg_0.15O₂ at 200 mA/g^[69]