一个新离子受体添加剂,用于-40°C的金属电池由离子/离子溶解工程
Meng Li1, Jinlong Jiang1, Ying Chen1
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
Angewandte Chemie (International ed. in English)
|October 17, 2024
概括
一种新的添加剂,4-aminophenylboronic acid pinacol ester (ABAPE),通过改善离子传输和稳定电极接口来提高金属电池的性能. 这使得循环寿命延长,在低温下稳定运行.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 金属电池 (SMB) 具有较高的理论容量和丰富的资源,但由于Na+离子运输动力学和界面不稳定性而面临挑战.
- 现有的研究往往忽略了电解质中的离子调节,使离子对电池性能影响的机制未得到充分研究.
研究的目的:
- 引入一种新的阴离子受体添加剂,4-氨基基酸皮纳科尔 (ABAPE),以提高中小企业的性能.
- 研究 ABAPE 提高 Na+ 运输和界面稳定性的机制.
主要方法:
- 使用理论计算来了解ABAPE与电解质组件的相互作用.
- 用深度Ar离子蚀刻的X射线光电子光谱 (XPS) 来分析电极-电解质接口.
- 电化学性能是使用Na saq saq Na的对称细胞和Na saq saq saq Na3V2(PO4) 3 (NVP) 细胞进行评估的.
主要成果:
- ABAPE有效地减弱了阴离子合,通过改变Na+溶解结构和降低溶解屏障,加速了Na+运输动力学.
- 添加剂促进形成稳定而密集的电极-电解质接口.
- ABAPE通过形成键来稳定电解质,防止NaPF6的水解和减轻酸性物种的形成,使长周期性能 (在对称细胞中500小时) 和NVP细胞中稳定的运行 (在1C下1200个周期后保持84.29%,在-40°C下没有衰变) 成为可能.
结论:
- 阳离子受体添加剂ABAPE显著提高金属电池的电化学性能.
- 在中小企业中,ABAPE为克服界面和动力限制提供了一个有希望的策略,特别是在低温应用中.
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