定量的复合金属锂作为三维泡沫锂电极用于锂电池的研究
Quantitative Lithium Composite as 3D Lithium Foam Anode for Lithium Metal Battery
Received date: 2022-02-07
Revised date: 2022-03-02
Online published: 2022-03-18
金属锂作为电池的负极材料具有极高的比容量和极低的氧化还原电位,能够显著提升电池的能量密度。然而,金属锂负极在实际应用中所面临的主要问题是锂枝晶、界面副反应和电极体积变化大的难题。在本文中,我们提出了一种通过将定量的金属锂与三维骨架进行复合形成三维泡沫锂负极的策略,并利用三维泡沫锂来抑制锂枝晶的生长和缓解电极的体积变化。因此,三维泡沫锂电极有利于金属锂负极的高效利用,并能借助其与平面锂箔相比更高的比表面积和更多的反应位点来提升电池的倍率性能。因此,通过采用三维泡沫锂,对称电池的循环寿命和倍率性能都得到了有效的提升。EIS数据结果表明,三维泡沫锂能够减小对称电池的电荷转移阻抗。而且,将三维泡沫锂作为负极组装的LTO全电池,与锂箔作为负极相比,循环1000周平均放电比容量从65 mAh·g-1提升至121 mAh·g-1。
李虎东 , 贾维尚 , 闫新秀 , 阳耀月 . 定量的复合金属锂作为三维泡沫锂电极用于锂电池的研究[J]. 电化学, 2022 , 28(8) : 2202051 . DOI: 10.13208/j.electrochem.2202051
Lithium (Li) metal as an anode material for batteries has extremely high specific capacity and extremely low redox potential, which can significantly improve the energy density of the battery. However, the main problems faced by the use of Li metal anodes are Li dendrite growth, interfacial side reaction and volumetric change of electrode. Herein, a strategy to prepare the three-dimensional (3D) Li foam by combining 3D scaffold with quantitative Li was proposed to suppress Li dendrites growth and alleviate electrode volumetric change. The 3D Li foam facilitated the efficient utilization of Li metal by suppressing the Li dendrite growth, mitigating the volumetric change, and improving the rate performance. Therefore, the cycling lifetime and rate performance of the symmetric cells using the 3D Li foam were improved. The EIS results showed that the 3D Li foam reduced the charge transfer resistance of the symmetric cells. And the average discharge specific capacity of the LTO cell during 1000 cycles was enhanced from 65 mAh·g-1 to 121 mAh·g-1 by using the 3D Li foam.
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