| 海藻酸钠-羧甲基纤维素钠凝胶涂层对锌负极稳定性的影响 | |
| Effect of sodium alginate-sodium carboxymethylcellulose gel layer on the stability of Zn anodes | |
| 摘要: 通过一种绿色、自交联策略，基于海藻酸钠(SA)和羧甲基纤维素钠(CMC)中羧基对Zn2+的离子缔合作用，利用旋涂法在锌电极表面原位构建了具有孔结构的柔性 SA+CMC 凝胶涂层(Zn@SA+CMC)。涂层中富含羟基，羟基的强吸附效应能够使涂层与锌电极紧密结合，减少界面处的副反应。柔性涂层不仅能适应锌电镀过程中的体积变化，还表现出较好的亲锌性，更低的成核过电压，更高的离子电导率，有利于Zn2+均匀沉积，有效抑制了锌枝晶的生成。因此，Zn@SA+CMC对称电池能稳定运行890h(3 mA·cm-2)；Zn@SA+CMC||MnO2全电池表现出优越的倍率和循环性能。 | |
| 关键词: 水系锌离子电池 海藻酸钠 羧甲基纤维素钠 凝胶涂层 亲锌性 | |
| 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: Here, we propose a green and self-crosslinking strategy to in-situ prepare a sodium carboxymethylcellulose (CMC) and sodium alginate (SA) layer on the Zn electrode (Zn@SA+CMC) via the superionic bonds between the carboxylate groups and Zn2+ . Scanning electron microscopy (SEM) images confirm a porous structure of the SA+ CMC layer. The functional effects of the gel layer are as follows. Firstly, the layer is rich in hydroxyl groups, which can be tightly adsorbed onto the Zn anode surface to form a protective layer and separate the Zn anode from the electrolyte. Secondly, the protective layer is a gel film, making it mechanically flexible, which can accommodate the volume change during Zn plating. Thirdly, the SA+CMC gel layer possesses zincophilicity, reduces interfacial resistance, lowers the nucleation energy barrier, and increases ionic conductivity, thereby promoting uniform Zn deposition and effectively inhibiting dendritic growth. As a result, the Zn@SA+CMC symmetrical cell sustained over 890 h of long-term stability at a high current density of 3 mA·cm-2 and the Zn@SA+CMC half cell could provide as high a Coulombic efficiency of 99.8% over 3 700 h (1 850 cycles). Furthermore, the Zn@SA+CMC||MnO2 full cell delivered a specific capacity of 185.1 mAh·g-1 at 0.3 A·g-1, maintaining stability for over 1 200 cycles. | |
| Keywords: aqueous Zn-ion battery sodium alginate sodium carboxymethylcellulose gel layer zincophilicity | |
| 投稿时间：2024-05-24 修订日期：2024-07-07 | |
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| 唐晓宁,刘珺楠,杨兴富,雷杰,罗秋洋,夏澍,薛安.海藻酸钠-羧甲基纤维素钠凝胶涂层对锌负极稳定性的影响[J].无机化学学报,2024,40(8):1452-1460. | |
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| Support information: 相关附件： 20240191_2024-7-6--补充材料.doc | |
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