P2-type manganese-based layered oxides are considered as promising cathode materials for sodium-ion batteries (SIBs). However, most of them suffer from sluggish kinetics and unfavorable structural stability, severely impeding their practical applications. Herein, Nasicon-type NaTi₂(PO₄)₃ (NTP) nanoshell is coated on the surface of P2-type Na_0.67Co_0.2Mn_0.8O₂ (NCM) to boost its performance as a novel cathode for SIBs. The as-prepared NCM@NTP7 exhibits smooth electrochemical charge/discharge profiles, with a specific capacity of 70.7 mAh/g at 20C, and 86.7% capacity retained at 0.5C after 150 cycles at room temperature. Impressively, the bulk structure can be stabilized via the absolute solid-solution reaction at low temperature (-20℃), which shows 120.9 mAh/g discharge capacity at 0.2C with 92.3% retention and fast Na⁺ transport kinetic, wherein the D value is 16 times as large as that of pristine NCM. Our study provides a simple and efficient strategy to design and optimize promising layer-structural cathodes for SIBs.

P2型锰基层状氧化物被认为是钠离子电池（SIB）的有希望的阴极材料。然而，它们中的大多数遭受动力学迟滞和不利的结构稳定性的困扰，从而严重阻碍了它们的实际应用。在此，在P 2型Na _0.67 Co _0.2 Mn _0.8 O ₂的表面上包覆有Nasicon型NaTi ₂（PO ₄）₃（NTP）纳米壳。（NCM）来提升其作为SIB新型阴极的性能。所制备的NCM @ NTP7表现出平滑的电化学充电/放电曲线，在20°C下的比容量为70.7 mAh / g，在室温下进行150次循环后在0.5C下的容量为86.7％。令人印象深刻的是，可以通过在低温（-20℃）下进行的绝对固溶反应来稳定整体结构，该反应在0.2C下的放电容量为120.9 mAh / g，保留率为92.3％，Na ^+的传输动力学很快，其中D值是原始NCM的16倍。我们的研究提供了一种简单有效的策略来设计和优化SIB的有前景的层结构阴极。