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首页> 外文期刊>Electrochimica Acta >Sodium-Based vs. Lithium-Based Dual-Ion Cells: Electrochemical Study of Anion Intercalation/De-Intercalation into/from Graphite and Metal Plating/Dissolution Behavior
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Sodium-Based vs. Lithium-Based Dual-Ion Cells: Electrochemical Study of Anion Intercalation/De-Intercalation into/from Graphite and Metal Plating/Dissolution Behavior

机译：基于钠的与锂基双离子细胞：远离阴离子插入/去嵌入的电化学研究，石墨和金属电镀/溶出行为

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Energy storage systems utilizing a simultaneous intercalation of anions into a graphite host structure at the positive electrode and intercalation/insertion/reduction or deposition of cations at the negative electrode during charge, were introduced under the term dual-ion cells, recently. In this work, the electrochemical intercalation of TFSI- anions into graphite has been studied in sodium-based dual-ion cells (SDICs) at different upper cut-off potentials varying between 4.5 V and 4.7 V vs. Na/Na+. Electrochemical characteristics of SDICs, including the reversible capacity, Coulombic efficiency, energy efficiency and onset potentials for anion intercalation, were evaluated in comparison to the lithium-based dual-ions cells (LDICs). A stable charge/discharge cycling performance over 500 cycles has been found for SDICs providing a specific capacity of approximate to 32 mAh g(-1) and a Coulombic efficiency exceeding 99% at an upper cut-off potential of 4.7 V vs. Na/Na+ at the graphite cathode. By the addition of the electrolyte additive ethylene sulfite (ES), an increase of the reversible capacity to approximate to 46 mAh g(-1) was achieved. Furthermore, possible reasons for the overall inferior cycling performance in terms of capacity for SDICs as compared to LDICs such as an increased overpotential for plating/stripping of Na+ ions as compared to Li+ ions are discussed. In this respect, we also found that the addition of ethylene sulfite particularly decreases the overpotentials for the metal plating process, which at least partially explains the enhanced reversible capacity in LDICs and SDICs by using ES as electrolyte additive. (C) 2017 Elsevier Ltd. All rights reserved.
机译：在术语双离子电池下，利用将阴离子的同时插入阴离子与阴离子的同时插入的石墨宿主结构进行在术语中引入负电极处的腔室宿主结构。在这项工作中，已经在4.5V和4.7V与Na / Na +之间的不同上截止电位中在基于钠基的双离子电池（SDICS）中研究了TFSIIONs进入石墨中的电化学嵌入。与锂基双离子细胞（LDICs）相比，评估了SDICS的电化学特性，包括可逆容量，库仑效率，能量效率和阴离子插入的发作电位。已经找到了500多个循环的稳定充电/放电循环性能，其SDICS提供了近似为32mAhg（-1）的特定容量，并且在4.7V与NA的上截止电位下超过99％的库仑效率超过99％。 Na +在石墨阴极。通过添加电解质添加剂乙烯亚硫酸盐（ES），达到了近似为46mAhg（-1）的可逆能力的增加。此外，与SDICS的容量相比，与LDIC相比，诸如与Li +离子相比的电镀/离子的剥离的过电位增加的LDICs的能力方面可能的原因。在这方面，我们还发现添加乙烯亚硫酸盐特别是通过使用ES作为电解质添加剂来解释LDIC和SDIC中的增强的可逆容量的整向性。 （c）2017 Elsevier Ltd.保留所有权利。

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