Manganese (Mn)-based cathodes with advantages of low-cost, environmental benign, high energy density are crucial for the commercial process of sodium ion batteries (SIBs). Layer-tunnel hybrid cathode, which aims to integrate high capacity of P2-type layered structure with excellent cycling stability, superior rate performance of tunnel structure, deserves great research efforts. To further enhance the respective performance, the ratio of layer-tunnel component in the hybrid Na_0.6Mn_1-xNi_xO₂ was adjusted by a simple cationic Ni²⁺ doping route. The crystal structure and electrochemical behavior of Na_0.6Mn_1-xNi_xO₂ were carefully detected, compared and analyzed. The comprehensive results evidenced that the layered component ratio would rapidly increase with Ni²⁺ doping. The structural parameters of pure phase would also be affected by varied Ni²⁺ content. And 5% Ni doping could be an optimized point in terms of reversible capacity, cycling stability, rate performance and reaction kinetics. This study would reveal the dual-function of cationic doping in both macro scale component ratio and atomic scale crystal lattice parameter, and grasp new insight into the design and optimization of high performance hybrid cathode for SIBs.

锰（Mn）基阴极具有低成本，环境友好，高能量密度的优势，对于钠离子电池（SIB）的商业化生产至关重要。旨在集成高容量的P2型层状结构，优异的循环稳定性，优异的隧道结构倍率性能的层隧道混合阴极值得大力研究。为了进一步提高各自的性能，通过简单的阳离子Ni ²⁺掺杂途径来调节杂化Na _0.6 Mn _{1- x} Ni _x O ₂中的层隧道成分的比例。Na _0.6 Mn _{1- x} Ni _x的晶体结构和电化学行为仔细检测，比较和分析O ₂。综合结果表明，随着Ni ^2+的掺杂，层状组分比将迅速增加。Ni ²⁺含量的变化也会影响纯相的结构参数。就可逆容量，循环稳定性，速率性能和反应动力学而言，5％Ni掺杂可能是一个最佳点。这项研究将揭示阳离子掺杂在宏观组分比例和原子尺度晶格参数方面的双重功能，并为SIBs高性能混合阴极的设计和优化提供新的见识。