| 甘氨酸电解液添加剂对水系锌离子电池电化学性能的影响 | |
| Effect of glycine electrolyte additive on the electrochemical performance of aqueous zinc-ion batteries | |
| 摘要: 水系锌离子电池因其高安全性、高容量、低价格等优点，有望成为下一代规模储能设备。然而，副反应、锌枝晶和有限的使用寿命阻碍了其实际应用。我们将电解质添加剂甘氨酸(Gly)引入到常规水系ZnSO4电解质中。Gly中的极性基团(—COOH和—NH2)可以调节Zn2+的溶剂化结构，从而重新分配Zn2+的沉积以避免枝晶和副反应发生。结果表明，在ZnSO4电解质中添加50 mmol·L-1的Gly后(ZnSO4-Gly)，Zn||Zn对称电池在1 mA·cm-2和1 mAh·cm-2下，表现出良好的循环寿命(3 000 h)，明显高于使用ZnSO4电解质的性能(300 h)。以ZnSO4-Gly为电解液的Zn||MnO2全电池，在比电容和倍率性能方面比无添加剂器件表现得更好。 | |
| 关键词: 水系锌离子电池 电解液添加剂 甘氨酸 锌负极 锌枝晶 | |
| 基金项目: 国家自然科学基金(No.22065005)、贵州省基础研究(自然科学)项目(黔科合基础-ZK[2023]一般048)和贵州大学引进人才科研项目(No.202052)资助。 | |
| Abstract: Aqueous zinc-ion batteries (AZIBs) using the Zn metal anode have been considered one of the next-generation commercial batteries with high security, robust capacity, and low price. However, side reactions, Zn dendrites, and limited lifespan still constrain their practical applications. Herein, the electrolyte additive (glycine, Gly) was introduced into the conventional ZnSO4 electrolyte (denoted as ZnSO4-Gly). The abundant polar groups (—COOH and —NH2) on the Gly can regulate the solvation structure of Zn2+ and thus redistribute Zn2+ deposition to avoid dendrites and side reactions. As a result, the excellent cycle life (3 000 h, at 1 mA·cm-2 and 1 mAh·cm-2) of the Zn||Zn symmetric cell was realized in typical ZnSO4 electrolytes with only 50 mmol·L-1 of Gly additive, overwhelmingly larger than bare ZnSO4 (300 h). The Zn||MnO2 battery with ZnSO4-Gly electrolyte displayed much better than the additive-free device in terms of specific capacity and capacity retention. | |
| Keywords: aqueous zinc-ion battery electrolyte additive glycine Zn anodes Zn dendrites | |
| 投稿时间：2023-04-14 修订日期：2023-06-18 | |
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| 唐晓宁,夏澍,罗秋洋,刘珺楠,杨兴富,邵姣婧,薛安.甘氨酸电解液添加剂对水系锌离子电池电化学性能的影响[J].无机化学学报,2023,39(8):1501-1509. | |
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