Electrochemical properties of P2-phase Na0.74CoO2 compounds as cathode material for rechargeable sodium-ion batteries

被引：140
|
作者：
Ding, J. J. [1 ]
Zhou, Y. N. [2 ]
Sun, Q. [1 ]
Yu, X. Q. [2 ]
Yang, X. Q. [2 ]
Fu, Z. W. [1 ]
机构：
[1] Fudan Univ, Dept Chem & Laser Chem, Shanghai Key Lab Mol Catalysts & Innovat Mat, Shanghai 200433, Peoples R China
[2] Brookhaven Natl Lab, Upton, NY 11973 USA
来源：
ELECTROCHIMICA ACTA | 2013年 / 87卷
关键词：
Sodium ion battery; Sodium cobalt oxides; Cathode material; ELECTROLYTE; CHALLENGES;
D O I：
10.1016/j.electacta.2012.09.058
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
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. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：388 / 393
页数：6
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