Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 10    October 2010

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Effects of Na content on structure and electrochemical performances of NaxMnO2+d cathode material
YANG Shun-yi(杨顺毅)1, WANG Xian-you(王先友)1, WANG Ying(王 莹)2,
CHEN Quan-qi(陈权启)1, LI Jiao-jiao(李姣姣)1, YANG Xiu-kang(杨秀康)

1. Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education,
School of Chemistry, Xiangtan University, Xiangtan 411105, China;
2. School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan 430073, China

Abstract:Sodium manganese oxides, NaxMnO2+d (x = 0.4, 0.5, 0.6, 0.7, 1.0; d = 0−0.3), were synthesized by solid-state reaction routine combined with sol-gel process. The structure, morphology and electrochemical performances of as-prepared samples were characterized by XRD, SEM, CV, EIS and galvanostatic charge/discharge experiments. It is found that Na0.6MnO2+d and Na0.7MnO2+d have high discharge capacity and good cycle performance. At a current density of 25 mA/g at the cutoff voltage of 2.0−4.3 V, Na0.6MnO2+d gives the second discharge capacity of 188 mA∙h/g and remains 77.9% of second discharge capacity after 40 cycles. Na0.7MnO2+d exhibits the second discharge capacity of 176 mA∙h/g and shows better cyclic stability; the capacity retention after 40 cycles is close to 85.5%. Even when the current density increases to 250 mA/g, the discharge capacity of Na0.7MnO2+d still approaches to 107 mA∙h/g after 40 cycles.

 

Key words: lithium-ion battery; cathode material; sodium manganese oxides; electrochemical properties; sol-gel technology

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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