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A High‐Capacity, Low‐Cost Layered Sodium Manganese Oxide Material as Cathode for Sodium‐Ion Batteries
Author(s) -
Guo Shaohua,
Yu Haijun,
Jian Zelang,
Liu Pan,
Zhu Yanbei,
Guo Xianwei,
Chen Mingwei,
Ishida Masayoshi,
Zhou Haoshen
Publication year - 2014
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201402138
Subject(s) - sodium , electrochemistry , manganese , sodium oxide , cathode , lamellar structure , oxide , inorganic chemistry , birnessite , materials science , sodium ion battery , ion , electrode , chemical engineering , chemistry , faraday efficiency , manganese oxide , metallurgy , organic chemistry , engineering
A layered sodium manganese oxide material (NaMn 3 O 5 ) is introduced as a novel cathode materials for sodium‐ion batteries. Structural characterizations reveal a typical Birnessite structure with lamellar stacking of the synthetic nanosheets. Electrochemical tests reveal a particularly large discharge capacity of 219 mAh g −1 in the voltage rang of 1.5–4.7 V vs. Na/Na + . With an average potential of 2.75 V versus sodium metal, layered NaMn 3 O 5 exhibits a high energy density of 602 Wh kg −1 , and also presents good rate capability. Furthermore, the diffusion coefficient of sodium ions in the layered NaMn 3 O 5 electrode is investigated by using the galvanostatic intermittent titration technique. The results greatly contribute to the development of room‐temperature sodium‐ion batteries based on earth‐abundant elements.