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New Insight into Ethylenediaminetetraacetic Acid Tetrasodium Salt as a Sacrificing Sodium Ion Source for Sodium-Deficient Cathode Materials for Full Cells
Sejong Univ, Dept Nano Technol & Adv Mat Engn, Seoul, South Korea; Sejong Univ, Sejong Battery Inst, Seoul, South Korea.
Sejong Univ, Dept Nano Technol & Adv Mat Engn, Seoul, South Korea; Sejong Univ, Sejong Battery Inst, Seoul, South Korea.
Sejong Univ, Dept Nano Technol & Adv Mat Engn, Seoul, South Korea; Sejong Univ, Sejong Battery Inst, Seoul, South Korea.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.ORCID iD: 0000-0002-6326-8106
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2019 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 11, no 6, p. 5957-5965Article in journal (Refereed) Published
Abstract [en]

Sacrificing sodium supply sources is needed for sodium-deficient cathode materials to achieve commercialization of sodium-ion full cells using sodium-ion intercalation anode materials. Herein, the potential of ethylenediaminetetraacetic acid tetrasodium salt (EDTA-4Na) as a sacrificing sodium supply source was investigated by intimately blending it with sodium-deficient P2-type Na0.67[Al0.05Mn0.95]O2. The EDTA-4Na/Na0.67[Al0.05Mn0.95]O2 composite electrode unexpectedly exhibited an improved charge capacity of 177 mA h (g-oxide)−1 compared with the low charge capacity of 83 mA h (g-oxide)−1 for bare Na0.67[Al0.05Mn0.95]O2. The reversible capacity of an EDTA-4Na/Na0.67[Al0.05Mn0.95]O2//hard carbon full-cell system increased to 152 mA h (g-oxide)−1 at the first discharge with a Coulombic efficiency of 89%, whereas the Na0.67[Al0.05Mn0.95]O2 without EDTA-4Na delivered a discharge capacity 51 mA h g–1 because of the small charge capacity. The EDTA-4Na sacrificed itself to generate Na+ ions via oxidative decomposition by releasing four sodium ions and producing C3N as a decomposition resultant on charge. It is thought that the slight increase in discharge capacity is associated with the electroconducting nature of the C3N deposits formed on the surface of the Na0.67[Al0.05Mn0.95]O2 electrode. We elucidated the reaction mechanism and sacrificial activity of EDTA-4Na, and our findings suggest that the addition of EDTA-4Na is beneficial as an additional source of Na+ ions that contribute to the charge capacity.

Place, publisher, year, edition, pages
2019. Vol. 11, no 6, p. 5957-5965
Keywords [en]
EDTA-4Na, additive, cathode, sodium, battery
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-378998DOI: 10.1021/acsami.8b18488ISI: 000459221900042PubMedID: 30653287OAI: oai:DiVA.org:uu-378998DiVA, id: diva2:1298621
Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25Bibliographically approved

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Zhu, Jie-Fang

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