Abstract P2–Na0.67Co0.20Mn0.79Ce0.01O2 (NCMC) was synthesized through Mn-site Ce-doping by solid-state method. The X-ray diffraction displays that P2-type structure of the pristine oxide with the space group of P63/mmc has not been changed by Ce-doping. XRD refinements and X-ray photoelectron spectroscopy analysis shows that cerium ions enter the lattice of the pristine oxide. The capacity retention rates of NCMC cathode are 92.3% at 0.1 C after 100 cycles and 91.7% at 1 C after 400 cycles, respectively. NCMC cathode exhibits superior cyclability. This is mainly attributed to the improved structural stability and the widened layer spacing of the pristine oxide and the relieved Jahn-Teller effect and highly reversible P2–P3–P2 phase transition during charge and discharge. This study is of great significance for the practical application of P2-type oxide.

中文翻译：

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Ce掺杂的P2-Na0.67Co0.20Mn0.80O2正极用于储钠的优异循环性能

摘要 P2–Na0.67Co0.20Mn0.79Ce0.01O2（NCMC）是通过固相法Mn位Ce掺杂合成的。X射线衍射表明，空间群为P63/mmc的原始氧化物的P2型结构没有被Ce掺杂改变。XRD 精修和 X 射线光电子能谱分析表明，铈离子进入原始氧化物的晶格。NCMC正极的容量保持率在0.1 C下100次循环后的容量保持率为92.3%，400次循环后在1 C下的容量保持率分别为91.7%。NCMC 正极表现出优异的循环性能。这主要归因于改善的结构稳定性和原始氧化物的加宽层间距以及缓解的 Jahn-Teller 效应和充放电过程中高度可逆的 P2-P3-P2 相变。