Ultrafine Silver Nanoparticles for Seeded Lithium Deposition toward Stable Lithium Metal Anode
Ultrafine Silver Nanoparticles for Seeded Lithium Deposition toward Stable Lithium Metal Anode
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DOI：
10.1002/adma.201702714
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发表时间：
2017-10-11
影响因子：
29.4
通讯作者：
Hu, Liangbing
中科院分区：
文献类型：
--
作者：
Yang, Chunpeng;Yao, Yonggang;Hu, Liangbing
为了利用锂（Li）金属电池的高能量密度，必须解决阳极的枝晶生长和界面不稳定性。预期Li金属的3D主体抑制Li枝晶的生长。异质晶种在引导Li沉积和实现对Li成核的空间控制方面是有效的。在此，这项研究表明，超细银（Ag）纳米粒子，这是通过一种新的快速焦耳加热方法合成，可以作为纳米种子，以指导三维主体材料内的锂的沉积，解决锂金属阳极的问题。通过优化焦耳加热方法，超细银纳米粒子（约40 nm）均匀锚定在碳纳米纤维。Ag纳米晶种有效地降低了Li的成核过电位，并引导Li均匀地沉积在3D碳基体中，不含枝晶。借助于3D衬底中的Ag纳米晶种实现了稳定且可逆的Li金属阳极，显示出低的过电位（约0.025V）以获得长的循环寿命。通过快速焦耳加热实现的超细纳米晶种使得Li金属阳极在3D主体中均匀沉积，有望用于高能应用的安全且长寿命的Li金属电池。
To exploit the high energy density of the lithium (Li) metal battery, it is imperative to address the dendrite growth and interface instability of the anode. 3D hosts for Li metal are expected to suppress the growth of Li dendrites. Heterogeneous seeds are effective in guiding Li deposition and realizing spatial control over Li nucleation. Herein, this study shows that ultrafine silver (Ag) nanoparticles, which are synthesized via a novel rapid Joule heating method, can serve as nanoseeds to direct the deposition of Li within the 3D host materials, resolving the problems of the Li metal anode. By optimizing the Joule heating method, ultrafine Ag nanoparticles (approximate to 40 nm) are homogeneously anchored on carbon nanofibers. The Ag nanoseeds effectively reduce the nucleation overpotential of Li and guide the Li deposition in the 3D carbon matrix uniformly, free from the dendrites. A stable and reversible Li metal anode is achieved in virtue of the Ag nanoseeds in the 3D substrate, showing a low overpotential (approximate to 0.025 V) for a long cycle life. The ultrafine nanoseeds achieved by rapid Joule heating render uniform deposition of Li metal anode in 3D hosts, promising a safe and long-life Li metal battery for high-energy applications.