材料科学
阳极
扫描电子显微镜
锂(药物)
集电器
电化学
硅
化学工程
纳米技术
光电子学
复合材料
电极
电解质
医学
工程类
内分泌学
物理化学
化学
作者
Jonas Schlaier,Şahin Cangaz,Sebastian Maletti,Christian Heubner,Thomas Abendroth,M. Schneider,Stefan Kaskel,A. Michaelis
标识
DOI:10.1002/admi.202200507
摘要
Abstract Silicon (Si) is considered the most promising anode material for next‐generation high‐energy lithium‐ion batteries. To enable the use of pure Si anodes, patterning is essential to reduce electrode degradation caused by volume changes during cycling. The authors herein report a facile and scalable Cu electrodeposition (Cu‐ECD) process to tailor the topography of Cu current collectors for the directed formation of columnar Si anodes by physical vapor deposition (PVD). ECD parameters, such as Cu concentration, temperature, potential, and deposited amount of Cu, are systematically varied. The most promising ECD parameters are applied to modify commercial Cu foils, which are then used to prepare columnar Si anodes via PVD. Modified current collectors and resulting Si anodes are investigated by scanning electron microscopy (SEM), laser scanning confocal microscopy, and adhesion tests. Selected Si anodes are characterized in battery cells regarding cycling stability. It is shown that the adjustment of the current collector topography results in a significant increase in cycling stability. SEM analysis revealed differences in the mechanical degradation and electrochemical capacity decay. Based on the results, process–structure–property relationships between the topography of the Cu‐ECD current collectors, the resulting columnar Si anodes and their electrochemical performance are derived.
科研通智能强力驱动
Strongly Powered by AbleSci AI