Premium
A Sodium Manganese Oxide Cathode by Facile Reduction for Sodium Batteries
Author(s) -
Song Jinju,
Gim Jihyeon,
Kim Sungjin,
Kang Jungwon,
Mathew Vinod,
Ahn Docheon,
Kim Jaekook
Publication year - 2014
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201301510
Subject(s) - sodium , inorganic chemistry , manganese , stoichiometry , materials science , intercalation (chemistry) , oxide , electrochemistry , cathode , chemistry , electrode , metallurgy , organic chemistry
A nonstoichiometric sodium manganese oxide (Na x MnO 2+ δ ) cathode useful for sodium batteries was synthesized by an ambient‐temperature strategy that involved facile reduction of aqueous sodium permanganate in sodium iodide and subsequent heat treatment at 600 °C. Combined powder X‐ray diffraction and synchrotron X‐ray diffraction analyses confirmed the annealed sample to belong to a Na x MnO 2 phase with a P 2‐hexagonal structure. The ICP‐AES results confirmed the stoichiometry of the sample to be Na 0.53 MnO 2+ δ . Electron microscopy studies revealed the particle size of the electrode to be in the range of a few hundred nanometers. The Na 0.53 MnO 2+ δ cathode delivered an average discharge capacity of 170 mA h g −1 with a stable plateau at 2.1 V for the initial 25 cycles versus sodium. Ex situ XANES studies confirmed the reversible intercalation of sodium into Na 0.53 MnO 2+ δ and suggested the accommodation of over‐stoichiometric Mn 4+ ions to contribute towards the performance of the electrode.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom