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3 (a) K0.77MnO2 ?H2O0.23 的HRTEM放大图[26]；(b) K0.77MnO2 ?H2O0.23 电极在电流密度为20 mA/g时的充放电曲线及其在10.5°～15.5°区域的原位XRD谱图[26]；(c) 电流密度为100 mA/g，循环100次时电极的循环性能和相应的库仑效率[26]；(d) K0.77MnO2 ?H2O0.23 电极充放电时的原位XRD表征[43]；(e) P2-K0.75[Ni1/3Mn2/3]O2 电极的XRD结果[44]；(f) 相应的计算晶格参数[44]；(g) 由实验计算的数据和第一性原理计算预测的数据[13]；(h) P2-K0.75MNFO2 在1.5～3.9 V(K/K+)电压范围内充放电过程的XRD图谱[13]

Fig. 3 (a) Enlarged HRTEM image of K0.77MnO2 ?H2O0.23[26]; (b) The first galvanostatic charge/discharge curves of the K0.77MnO2 ?H2O0.23 electrode at a current density of 20 mA/g and corresponding ex situ XRD patterns in the 2θ region of 10.5°～15.5°[26]; (c) Cycle performances and corresponding Coulombic efficiencies of the electrode at a current density of 100 mA/g for 100 cycles[26]; (d) In situ XRD characterization of K0.27(Mn0.98O2)?(H2O)0.53 electrode upon charge/discharge[43]; (e) Operando-XRD result of P2-K0.75[Ni1/3Mn2/3]O2 electrode[44]; (f) the corresponding calculated lattice parameters for o-XRD pattern[44]; (g)from experimentally calculated data and data predicted by first-principles calculations[13]; (h) Contour maps in selected 2θ ranges obtained from In operando XRD patterns of P2-K0.75MNFO2 during the charge-discharge process in the range of 1.5～3.9 V (K/K+)[13]