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梯度离子调节电流采集器用于高性能和无树突的金属电池

Jia-Hao Zhang¹, Yu Chang¹, Jia-Cheng Yu²

¹State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.

ACS applied materials & interfaces

|July 31, 2024

概括

这项研究介绍了一种新型的电流采集器,使用金纳米粒子和多多巴胺用于稳定,无树的金属阳极. 这项创新提高了电池的安全性和性能,为商业金属电池铺平了道路.

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:

金属阳极提供高能量密度,但受到状物生长和体积变化的影响,危及安全性和循环寿命.
目前稳定金属阳极的方法对于大规模的商业应用是不够的.
控制离子沉积对于开发安全高效的金属电池至关重要.

研究的目的:

开发一种用于稳定且无树的金属阳极的新型电流采集器.
调查渐变金纳米粒子分布和多多巴胺封装对沉积的影响.
为了提高金属电池的安全性和电化学性能.

主要方法:

一个3D碳纤维纸 (CP) 电流收集器的制造,用渐变金纳米粒子 (Au) 装饰,并用聚多巴胺 (PDA) 封装.
在对称和全细胞中对CP/Au/PDA电极的电化学表征.
对沉积行为和体积变化适应的分析.

主要成果:

CP/Au/PDA电极显示出均的沉积,具有9mV的低核化超电位.
高库伦比效率 (平均值~98.8%) 在1 mA cm−2 达到1 mAh cm−2.2.
对称的细胞表现出超低电压歇斯底里 (~20 mV) 和长周期寿命 (1000 h).
一个LiFePO4 (LFP) 完全电池在1°C的350个循环后显示出136mAhg-1的高放电容量,容量损失最小.

结论:

性Au纳米颗粒的梯度分布和现场形成的Li-PDA层有效调节Li+运输和沉积.
3D CP结构适应体积变化,确保电极的稳定性.
这种梯度离子调节电流采集器代表了无树的金属阳极和更安全的电池的重大进步.

关键词:

金属电池金属电池梯度黄金结构的梯度黄金结构.的树突是的树突.离子调节的离子调节聚多巴胺胺是一种多多巴胺胺.

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