当前位置: X-MOL 学术J. Phys. Chem. C › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Formation of Stable Solid–Electrolyte Interphase Layer on Few-Layer Graphene-Coated Silicon Nanoparticles for High-Capacity Li-Ion Battery Anodes
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2017-11-15 00:00:00 , DOI: 10.1021/acs.jpcc.7b05876
Jong Hwan Park 1, 2 , Junhyuk Moon 1 , Sangil Han 3 , Seongyong Park 4 , Ju Wan Lim 1 , Dong-Jin Yun 4 , Dong Young Kim 1 , Kwangjin Park 1 , In Hyuk Son 1
Affiliation  

Silicon-based anode materials exhibit higher specific and volumetric capacities than other materials and have therefore received much attention for potential use in lithium-ion batteries. However, the continuous growth of a solid–electrolyte interphase at the surface of silicon is a primary cause of chronic capacity fading of silicon electrodes. In this paper, we report the formation of an electrochemically stable solid–electrolyte interphase layer on the surfaces of the few-layer graphene-coated silicon nanoparticles. During the first lithiation, electrolyte molecules were electrochemically decomposed and deposited on the surface of few-layer graphene, thus forming a stable protective layer. When combined with an ionic liquid electrolyte based on pyrrolidinium and bis(fluorosulfonyl)imide, an anode containing 75% few-layer graphene-coated silicon delivered a reversible capacity of 1770 mAh g–1 (1430 mAh/ccelectrode) at a current density of 400 mAh g–1 (2 mAh cm–2) after 200 cycles. Averaged over the first 200 cycles, the half-cell exhibits a capacity loss of only 7.2% with a Coulombic efficiency of 99.4%. The results of our study demonstrate that the few-layer graphene coating may lead to an ideal candidate for the generation of a stable protecting layer for a silicon anode that is otherwise harmed by side reactions with electrolytes during cycling.

中文翻译:

在高容量锂离子电池阳极的几层石墨烯涂层的硅纳米粒子上形成稳定的固体电解质中间层

硅基负极材料比其他材料具有更高的比容量和体积容量,因此在锂离子电池中的潜在用途受到了广泛关注。但是,硅表面上固-电解质界面的连续生长是硅电极长期容量衰减的主要原因。在本文中,我们报告了在几层石墨烯包覆的硅纳米颗粒表面上形成了电化学稳定的固-电解质中间相层。在第一次锂化期间,电解质分子被电化学分解并沉积在几层石墨烯的表面上,从而形成稳定的保护层。当与基于吡咯烷鎓和双(氟磺酰基)酰亚胺的离子液体电解质混合使用时,200次循环后,电流密度为400 mAh g时–1(1430 mAh / cc电极)– 1(2 mAh cm –2)。在前200个循环中平均,半电池的容量损失仅为7.2%,库仑效率为99.4%。我们的研究结果表明,很少层的石墨烯涂层可能会为生成稳定的硅阳极保护层提供理想的选择,否则该保护层会受到循环过程中与电解质的副反应的损害。
更新日期:2017-11-16
down
wechat
bug