法拉第效率
插层(化学)
电化学
阴极
氧化还原
极化(电化学)
X射线光电子能谱
离子
阳极
钠离子电池
钠
材料科学
无机化学
化学
相(物质)
化学工程
电极
物理化学
冶金
有机化学
工程类
作者
Jingjun Ding,Yong‐Ning Zhou,Qian Sun,Xiqian Yu,Xiao‐Qing Yang,Zheng‐Wen Fu
标识
DOI:10.1016/j.electacta.2012.09.058
摘要
P2-phase Na0.74CoO2 cathode material prepared by a solid-state method exhibits the specific discharge capacity of 107 mAh g−1 at 0.1 C with good cycling performance for rechargeable sodium ion batteries. The voltage polarization between charging and discharging at 0.1 C rate is about 150–250 mV and the coulombic efficiency in each cycle is about 89%. The expansion and compression in c-axis of the NaxCoO2 unit cell during the Na intercalation/deintercalation is revealed by ex situ XRD. XPS and in situ XAS data directly confirm that deintercalation/intercalation of Na ions from/into the layered structure proceeds with the Co3+/Co4+ redox reaction.
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