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Synthesis, Structure, and Electrochemical Properties of Na3MB5O10 (M = Fe, Co) Containing M2+in Tetrahedral Coordination
- Source :
- Inorganic Chemistry, Inorganic Chemistry, 2016, ⟨10.1021/acs.inorgchem.6b02070⟩, Inorganic Chemistry, American Chemical Society, 2016, ⟨10.1021/acs.inorgchem.6b02070⟩
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- International audience; In the search for new cathode materials for sodium ion batteries, the exploration of polyanionic compounds has led to attractive candidates in terms of high redox potential and cycling stability. Herein we report the synthesis of two new sodium transition metal pentaborates Na 3 MB 5 O 10 (M = Fe, Co), where Na 3 FeB 5 O 10 represents the first sodium iron borate reported at present. By means of synchrotron X-ray diffraction, we reveal a layered structure consisting of pentaborate B 5 O 10 groups connected through M 2+ in tetrahedral coordination, providing possible three-dimensional Na-ion migration pathways. Inspired by these structural features we examined the electrochemical performances versus sodium and show that Na 3 FeB 5 O 10 is active at an average potential of 2.5 V vs. Na + /Na 0 , correlated to the Fe 3+ /Fe 2+ redox couple as deduced from ex situ Mössbauer measurements. This contrasts with Na 3 CoB 5 O 10 which is electrochemical inactive. Moreover, we show that their electrochemical performances are kinetically limited as deduced by complementary AC/DC conductivity measurements, hence confirming once again the complexity in designing highly performant borate-based electrodes.
- Subjects :
- Diffraction
Chemistry
Sodium
Inorganic chemistry
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Redox
Synchrotron
Cathode
0104 chemical sciences
law.invention
Inorganic Chemistry
Crystallography
law
Mössbauer spectroscopy
[CHIM]Chemical Sciences
Physical and Theoretical Chemistry
0210 nano-technology
Boron
Subjects
Details
- Language :
- English
- ISSN :
- 00201669 and 1520510X
- Database :
- OpenAIRE
- Journal :
- Inorganic Chemistry, Inorganic Chemistry, 2016, ⟨10.1021/acs.inorgchem.6b02070⟩, Inorganic Chemistry, American Chemical Society, 2016, ⟨10.1021/acs.inorgchem.6b02070⟩
- Accession number :
- edsair.doi.dedup.....f9dde184d5b3e435e071f5f2fe84984a