材料科学
锂(药物)
阳极
合金
阴极
环境友好型
基质(水族馆)
硅
纳米技术
电偶阳极
电极
冶金
电池(电)
集电器
法拉第效率
箔法
复合材料
化学
电解质
阴极保护
物理化学
功率(物理)
内分泌学
地质学
物理
海洋学
生物
医学
量子力学
生态学
作者
Shyam Sharma,Patrick Crowley,Arumugam Manthiram
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2021-10-21
卷期号:9 (43): 14515-14524
被引量:13
标识
DOI:10.1021/acssuschemeng.1c05168
摘要
Aluminum foils are highly promising anode materials for enabling next-generation Li-ion batteries that are simultaneously low-cost, environmentally friendly, and high-performing. However, the practical application of Al foil anodes has been hindered by the issues of low Coulombic efficiency and rapid mechanical failure, leading to poor cycle life. Here, we demonstrate the positive effect of as low as 1% silicon addition (Al99.0Si1.0) on the performance of a free-standing, aluminum foil anode. The Al99.0Si1.0 foil anode displays substantial improvements in both cycle life (>100 cycles) and Coulombic efficiency (>99.5%) compared to pure Al in both half-cells and full cells paired with a LiFePO4 cathode. Ex situ morphological analysis with scanning electron microscopy reveals the formation of a large, interconnected network of deep cracks in Al99.0Si1.0 after the initial cycle, generating nanostructured, porous aluminum “islands” supported by a pristine, unreacted aluminum substrate. We believe that this highly stable structure allows for facile lithium transport and has the capability to freely expand/contract without isolation from the base foil, preventing rapid mechanical failure of the electrode. Our results demonstrate the potential of Al–Si alloy foil anodes as a low-cost, sustainable battery material, and the study will stimulate further exploration of Al-alloy foil anodes.
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