Synergistic Effect of Cathode and Electrolyte Additives on Stabilizing the Anodic Interface for Sodium-based Dual-carbon Batteries
Synergistic Effect of Cathode and Electrolyte Additives on Stabilizing the Anodic Interface for Sodium-based Dual-carbon Batteries
复制标题
DOI：
10.1016/j.jallcom.2023.168863
复制
发表时间：
2023-01
影响因子：
6.2
通讯作者：
Li Zhang;Ziqiang Liu;Xiaqing Zhang;Jianze Feng;Hongyun Ma;W. Feng;Xiaoyun Wang;Qian Yue;
中科院分区：
文献类型：
--
作者：
Li Zhang;Ziqiang Liu;Xiaqing Zhang;Jianze Feng;Hongyun Ma;W. Feng;Xiaoyun Wang;Qian Yue;
钠基双碳电池（SDCBs）作为一种新型的储能装置，由于其成本低廉和钠的天然丰富性，引起了人们越来越多的关注。然而，目前此类器件的应用受到低比容量和较差循环稳定性的限制，这是由不稳定阳极界面的形成和电解质中阴离子和阳离子之间的显著串扰引起的。在这里，我们提出了一个双添加剂的策略，采用Na 2C 2 O 4作为阴极添加剂和氟代碳酸乙烯酯（FEC）作为电解质添加剂，有效地创建一个稳定的阳极界面，抑制阴-阳离子串扰。具有双添加剂的所构造的SDCB提供良好的倍率性能（在0.5 A g− 1下为30.9 mAh g−1）、优异的循环稳定性（在0.1 A g− 1下在280次循环后保持约81.9%）以及192.6 Wh kg−1的高能量密度，这比仅具有一种添加剂或不具有任一添加剂的SDCB的性能优越上级。添加双添加剂后，循环阳极的阳极界面变得稳定均匀，富钠无机物相增多，有机物相减少。该方法具有成本低、操作简便、安全性高、环境友好等优点，可有效提高SDCB的电化学性能，促进其商业化应用。
Sodium-based dual-carbon batteries (SDCBs), as a novel energy storage device, have aroused increasing interest due to their low cost and the natural abundance of sodium. However, the application of such devices is currently limited by the low specific capacity and inferior cyclic stability, which is caused by the formation of an unstable anodic interface and significant crosstalk between anions and cations in the electrolyte. Here, we propose a dual-additive strategy employing Na2C2O4as a cathode additive and fluoroethylene carbonate (FEC) as an electrolyte additive that effectively creates a stable anodic interface and suppresses anion-cation crosstalk. The as-constructed SDCBs with dual additives deliver good rate capability (30.9 mAh g−1at 0.5 A g−1), excellent cyclic stability (∼81.9 % retention at 0.1 A g−1after 280 cycles), and a high energy density of 192.6 Wh kg−1, which is superior to the performance of SDCBs with only one of the additives or without either additive. The anodic interface on the cycled anode becomes stable and uniform after the addition of the dual additives, and contains more Na-rich inorganic species and fewer organic species. The proposed strategy can improve the electrochemical performances of SDCBs and promote the commercial application of such devices thanks to the low cost, ease of operation, high safety, and environmental friendliness.