Intercalated Si/C films as the anode for Li-ion batteries with near theoretical stable capacity prepared by dual plasma deposition
Intercalated Si/C films as the anode for Li-ion batteries with near theoretical stable capacity prepared by dual plasma deposition
复制标题
双等离子体沉积制备插层Si/C薄膜作为锂离子电池负极，容量接近理论稳定
DOI：
10.1016/j.jpowsour.2012.08.042
复制
发表时间：
2013-01-01
影响因子：
9.2
通讯作者：
Li, Xingguo
中科院分区：
文献类型：
--
作者：
Li, Wei;Yang, Rong;Li, Xingguo
Si作为锂离子电池的负极材料具有非常高的理论容量（4200 inAh g（-1）），这比目前商业化的石墨负极高近十倍。然而，它遭受严重的体积膨胀/收缩在充电/放电过程中，这是其应用的主要障碍。在这项工作中，我们制备的Si/C复合阳极插入Si/C多层结构交替沉积C和Si的C2 H2的等离子体分解和磁控溅射的Si靶，分别。对于薄Si层，经过100多次循环后可以达到接近理论的容量（约4000 mAh g（-1）），这归因于碳层的缓冲效应。这种结构也可扩展到多个Si/C层。发现硅层的临界厚度为20 nm，低于该临界厚度可以稳定地保持接近理论容量。这一临界厚度可能为未来设计具有高容量和稳定性的锂离子电池纳米结构硅阳极提供启示。(C)2012爱思唯尔有限公司版权所有。
Si has a very high theoretical capacity of 4200 inAh g(-1) as the anode materials for lithium ion batteries, which is near ten times higher than that of the current commercial graphite anode. However, it suffers from severe volume expansion/contraction during the charge/discharge processes, which is the main obstacle for its application. In this work, we prepare Si/C composite anodes with an intercalated Si/C multilayer structure by alternately depositing C and Si by plasma decomposition of C2H2 and magnetron sputtering of a Si target, respectively. Near theoretical capacity can be achieved (about 4000 mAh g(-1)) for more than 100 cycles for thin Si layers, which is attributed to the buffer effect of the carbon layers. This structure is also scalable up to multiple Si/C layers. A critical thickness of 20 nm is found for the silicon layer, below which the near theoretical capacity can be stably maintained. This critical thickness may shed light on future designs of nanostructured silicon anode with high capacity and stability for lithium ion batteries. (C) 2012 Elsevier B.V. All rights reserved.