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Yang, Hao; Jia, Weishang; Zhang, Jingfang; Liu, Yuchi; Wang, Zihao; Yang, Yaoyue; Feng, Lanxiang; Yan, Xinxiu; Li, Tao; Zou, Wei; Li, Jingze
Journal of colloid and interface science, 20/May , Letnik: 661Journal Article
The Cu collector is modified with Ag and Sn coatings through a simple and efficient substitution reaction. Ag demonstrates higher lithiophilicity compared to Sn, and the gradient modification of the Cu foam enables control over the deposition site of Li metal. This leads to improved space utilization and enhanced C-rate performance of the 3D scaffold. Display omitted Metallic lithium (Li) is highly desirable for Li battery anodes due to its unique advantages. However, the growth of Li dendrites poses challenges for commercialization. To address this issue, researchers have proposed various three-dimensional (3D) current collectors. In this study, the selective modification of a 3D Cu foam scaffold with lithiophilic elements was explored to induce controlled Li deposition. The Cu foam was selectively modified with Ag and Sn to create uniform Cu foam (U-Cu) and gradient lithiophilic Cu foam (G-Cu) structures. Density Functional Theory (DFT) calculations revealed that Ag exhibited a stronger binding energy with Li compared to Sn, indicating superior Li induction capabilities. Electrochemical testing demonstrated that the half cell with the G-Cu@Ag electrode exhibited excellent cycling stability, maintaining 550 cycles with an average Coulombic efficiency (CE) of 97.35%. This performance surpassed that of both Cu foam and G-Cu@Sn. The gradient modification of the current collectors improved the utilization of the 3D scaffold and prevented Li accumulation at the top of the scaffold. Overall, the selective modification of the 3D Cu foam scaffold with lithiophilic elements, particularly Ag, offers promising prospects for mitigating Li dendrite growth and enhancing the performance of Li batteries.
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