Subramanyan Krishnan, Lee Yun-Sung, Aravindan Vanchiappan
Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati 517507, India.
Department of Advanced Chemicals and Engineering, Chonnam National University, Gwang-ju 61186, Republic of Korea.
J Colloid Interface Sci. 2021 Jan 15;582(Pt A):51-59. doi: 10.1016/j.jcis.2020.08.043. Epub 2020 Aug 11.
An immense effort has been put into developing high-performance electrodes to commercialize sodium-ion batteries, but research on developing an efficient electrolyte is lacking. This study aims to find the best carbonate-based electrolyte systems by incorporating the existing ideas reported in this field. The sodium superionic conductor (NASICON) type NaV(PO)F-C (NVPF-C) was chosen as a cathode, and its compatibility with four different carbonate-based electrolyte solutions was studied in the half-cell assembly. Additionally, full-cell assembly with hard carbon as an anode is also explored. Binary and ternary combinations of the solvents ethylene carbonate, propylene carbonate, and dimethyl carbonate were employed with and without fluoroethylene carbonate as an additive. A systematic study was performed, including the in-situ impedance technique, and to determine the compatibility. Detailed galvanostatic studies for NVPF-C based half-cells, as well as hard carbon/NVPF-C full-cells, are performed, which shows that 1 M NaClO in propylene carbonate:dimethyl carbonate + fluoroethylene carbonate is a better electrolyte composition for this assembly. Subsequently, a temperature study was carried out on this electrolyte to test its performance.
为了使钠离子电池商业化，人们付出了巨大努力来开发高性能电极，但在开发高效电解质方面的研究却很匮乏。本研究旨在通过整合该领域已报道的现有思路，找到最佳的碳酸盐基电解质体系。选择钠超离子导体（NASICON）型NaV(PO)F-C（NVPF-C）作为阴极，并在半电池组件中研究了其与四种不同碳酸盐基电解质溶液的兼容性。此外，还探索了以硬碳为阳极的全电池组装。使用碳酸亚乙酯、碳酸丙烯酯和碳酸二甲酯的二元和三元组合，并添加或不添加氟代碳酸乙烯酯作为添加剂。进行了包括原位阻抗技术在内的系统研究，以确定兼容性。对基于NVPF-C的半电池以及硬碳/NVPF-C全电池进行了详细的恒电流研究，结果表明，碳酸丙烯酯：碳酸二甲酯 + 氟代碳酸乙烯酯中的1 M NaClO是该组装的较好电解质组成。随后，对该电解质进行了温度研究以测试其性能。
