Neutron Diffraction and Electrochemical Studies of Na0.79CoO2 and Na0.79Co0.7Mn0.3O2 Cathodes for Sodium-Ion Batteries

被引：20

作者：

Beck, Faith R. ^{[1
]}

Cheng, Y. Q. ^{[2
]}

Bi, Zhonghe ^{[2
]}

Feygenson, Mikhail ^{[2
]}

Bridges, Craig A. ^{[2
]}

Moorhead-Rosenberg, Zachary ^{[3
]}

Manthiram, Arumugam ^{[3
]}

Goodenough, John B. ^{[3
]}

Paranthaman, M. Parans ^{[2
]}

Manivannan, Ayyakkannu ^{[1
,4
,5
]}

机构：

[1] US DOE, NETL, Morgantown, WV 26507 USA

[2] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA

[3] Univ Texas Austin, Austin, TX 78712 USA

[4] W Virginia Univ, Phys Dept, Morgantown, WV 26506 USA

[5] W Virginia Univ, Dept Mech Engn, Morgantown, WV 26506 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2014年 / 161卷 / 06期

基金：

美国国家科学基金会;

关键词：

NA-BATTERIES; ELECTRODE; PERFORMANCE; INSERTION; NACOO2; GROWTH; NMR;

D O I：

10.1149/2.025406jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Na0.79CoO2 and Na0.79Co0.7Mn0.3O2 with a layered hexagonal structure (P2-type) were synthesized by the Pechini process followed by heat-treatment at elevated temperatures in order to achieve the crystalline phases. The samples were characterized with X-ray diffraction, neutron diffraction, magnetic measurements and electrochemical charge-discharge cycling. X-ray diffraction confirmed the presence of P2 layered hexagonal structure after heat-treatment at 900 degrees C in air. Neutron diffraction patterns confirm Mn substitution on Co sites without forming pronounced Mn-Co ordering. Cyclic voltammetry showed the oxidation and reduction peaks of Co and Mn, indicating the intercalation and de-intercalation behavior of the Na ions. A discharge capacity of 60 mAh/g was achieved for both compositions, with the Na0.79Co0.70Mn0.3O2 composition showing a more stable discharge capacity up to 60 cycles. (C) 2014 The Electrochemical Society.

引用

页码：A961 / A967

页数：7

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