固溶体
电极
钠
化学
无机化学
材料科学
物理化学
冶金
作者
Naoaki Yabuuchi,Mitsuyasu Yano,Hiroaki Yoshida,Satoru Kuze,Shinichi Komaba
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2013-01-01
卷期号:160 (5): A3131-A3137
被引量:179
摘要
NaFex(Ni1/2Mn1/2)1-xO2 layered oxides are synthesized by a solid-state method, and their electrode properties as positive electrodes for rechargeable sodium batteries are examined. Crystallographic analysis on a series of samples reveals that NaFex(Ni1/2Mn1/2)1-xO2 samples crystallize into a solid solution between two end-members of O3-type Na(Ni1/2Mn1/2)O2 and NaFeO2. A Na/NaFe0.4(Ni1/2Mn1/2)0.6O2 cell delivers 130 mAh g−1 of reversible capacity in a voltage range of 2.0 – 3.8 V. Energy density available based on metallic sodium is estimated to be approximately 400 mWh g−1, which is considerably larger than that of NaFeO2 (∼300 mWh g−1). Moreover, the Na/NaFe0.4(Ni1/2Mn1/2)0.6O2 cell shows relatively good cyclability and rate-capability. From these results, a potential application of the NaFex(Ni1/2Mn1/2)1-xO2 solid solution for rechargeable Na-ion batteries is discussed.
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