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Journal of The Electrochemical Society, 158 (12) A1307-A1312 (2011) A1307 0013-4651/2011/158(12)/A1307/6/$28.00 © The Electrochemical Society Electrochemical Properties of

By Monoclinic Namno, Xiaohua Ma and Hailong Chen

Abstract

Monoclinic α- NaMnO2 is re-investigated electrochemically as a positive electrode material for sodium ion batteries. About 0.85 Na can be deintercalated from NaMnO2 and 0.8 Na be intercalated back during potentiostatical intermittent charge and discharge. Galvanostatical cycling between 2.0 V and 3.8 V gives 185 mAh/g discharge capacity for the first cycle at C/10 rate and 132 mAh/g remains after 20 cycles. Charge and discharge curves are significantly different indicating more hysteresis than is typical for lithium intercalation compounds. We also explain the remarkable difference between layered LiMnO2 and NaMnO2 upon alkali removal. © 2011 The Electrochemical Society. [DOI: 10.1149/2.035112jes] All rights reserved. Manuscript submitted June 24, 2011; revised manuscript received September 2, 2011. Published November 1, 2011. LixMO2 (M = 3d transition metal) compounds with the O3 layered structure have been intensively studied as positive electrode materials for lithium ion batteries, and LiCoO2 and LiNiO2 –basedmaterials op-erate well as Li-intercalation materials. For several other 3d transition metals LiMO2 either does not easily form the O3-layered structure (M = Ti, Fe, Mn), or does not reversibly deintercalate lithium (M = V, Cr, Fe, Mn).1–3 Indeed, layered LiFeO2 and LiMnO2 ca

Year: 2016
DOI identifier: 10.1149/2.035112jes
OAI identifier: oai:CiteSeerX.psu:10.1.1.1015.377
Provided by: CiteSeerX
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