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首页> 外文期刊>Advanced energy materials >Layered Na-lon Cathodes with Outstanding Performance Resulting from the Synergetic Effect of Mixed P- and O-Type Phases
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Layered Na-lon Cathodes with Outstanding Performance Resulting from the Synergetic Effect of Mixed P- and O-Type Phases

机译：分层NA-LON阴极，具有卓越的性能，由混合P-和O型阶段的协同作用产生

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摘要

Herein, the synthesis of new quaternary layered Na-based oxides of the type NaxMnyNizFe0.1Mg0.1O2 (0.67 x 1.0; 0.5 y 0.7; 0.1 z 0.3) is described. The synthesis can be tuned to obtain P2- and O3-type as well as mixed P-/O-type phases as demonstrated by structural, morphological, and electrochemical properties characterization. Although all materials show good electrochemical performance, the simultaneous presence of the P- and O-type phases is found to have a synergetic effect resulting in outstanding performance of the mixed phase material as a sodium-ion cathode. The mixed P3/P2/O3-type material, having an average elemental composition of Na0.76Mn0.5Ni0.3Fe0.1Mg0.1O2, overcomes the specific drawbacks associated with the P2- and O3-type materials, allowing the outstanding electrochemical performance. In detail, the mixed phase material is able to deliver specific discharge capacities of up to 155 mAh g(-1) (18 mA g(-1)) in the potential range of 2.0-4.3 V. In the narrower potential range of 2.5-4.3 V the material exhibits high average discharge potential (3.4 V versus Na/Na+), exceptional average coulombic efficiencies (99.9%), and extraordinary capacity retention (90.2% after 601 cycles). The unexplored class of P-/O-type mixed phases introduces new perspectives for the development of layered positive electrode materials and powerful Na-ion batteries.
机译：在此，描述了Naxmnynizfe0.1Mg0.1Mg0.1Mg0.1Mg0.1MG0.1MG0.1MG0.1MG0.1MG0.1MG0.1MY10.1MG0.1O2（0.67×1.0; 0.5°Y 0.7; 0.1 Z 0.3）的新季铵分层Na基氧化物的合成。可以调整合成以获得P2-和O 3类型以及通过结构，形态学和电化学性质表征所证明的混合的P-/ O型相。尽管所有材料都显示出良好的电化学性能，但发现P-and O型相的同时存在具有协同作用，导致混合相材料作为钠离子阴极的优异性能。混合的P3 / P2 / O 3型材料，具有Na0.76mN0.5Ni0.1MG0.1MG0.1O2的平均元素组成，克服了与P2和O3型材料相关的特定缺点，允许出色的电化学性能。详细地，混合相材料能够在2.0-4.3V的电位范围内提供高达155mAhg（-1）（18mA G（-1））的特定放电容量。在2.5的较窄势范围内-4.3 V材料表现出高平均放电电位（3.4V与Na / Na +），卓越的平均库仑效率（> 99.9％），和非凡的容量保留（601次循环后90.2％）。未开发的P-/ O型混合阶段的类别引入了分层正极材料和强大的NA离子电池的开发的新视角。

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