电化学
氧化还原
阴极
材料科学
离子
钠
电极
储能
无机化学
化学工程
化学
物理化学
冶金
热力学
物理
工程类
功率(物理)
有机化学
作者
Charifa Hakim,Noha Sabi,Le Anh,Mouad Dahbi,Daniel Brandell,Kristina Edström,Laurent Duda,Ismae͏̈l Saadoune,Reza Younesi
标识
DOI:10.1038/s42004-020-0257-6
摘要
Rechargeable sodium-ion batteries have recently attracted renewed interest as an alternative to Li-ion batteries for electric energy storage applications, because of the low cost and wide availability of sodium resources. Thus, the electrochemical energy storage community has been devoting increased attention to designing new cathode materials for sodium-ion batteries. Here we investigate P2- Na0.78Co1/2Mn1/3Ni1/6O2 as a cathode material for sodium ion batteries. The main focus is to understand the mechanism of the electrochemical performance of this material, especially differences observed in redox reactions at high potentials. Between 4.2 V and 4.5 V, the material delivers a reversible capacity which is studied in detail using advanced analytical techniques. In situ X-ray diffraction reveals the reversibility of the P2-type structure of the material. Combined soft X-ray absorption spectroscopy and resonant inelastic X-ray scattering demonstrates that Na deintercalation at high voltages is charge compensated by formation of localized electron holes on oxygen atoms.
科研通智能强力驱动
Strongly Powered by AbleSci AI