Gram-Scale Synthesis of Graphene-Mesoporous SnO2 Composite as Anode for Lithium-ion Batteries
Gram-Scale Synthesis of Graphene-Mesoporous SnO2 Composite as Anode for Lithium-ion Batteries
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克级合成石墨烯-介孔 SnO2 复合材料作为锂离子电池负极
DOI：
10.1016/j.electacta.2014.11.100
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发表时间：
2015
影响因子：
6.6
通讯作者：
Yu Yan
中科院分区：
文献类型：
--
作者：
Liu Xiaowu;Zhong Xiongwu;Yang Zhenzhong;Pan Fusen;Gu Lin;Yu Yan
基于Kirkendall效应成功实现了石墨烯基介孔SnO 2复合材料（G-M-SnO 2）的克级合成。当用作锂离子电池的阳极时，它在100 mAg− 1下50次循环后可提供1354 mAhg− 1的高可逆容量，在2 Ag−1下可提供664 mAhg− 1的出色倍率性能。这种优异的储锂性能主要是由于超微细SnO 2和导电石墨烯纳米粒子的协同效应，不仅提高了整个电极的导电性，而且为SnO 2纳米粒子在充放电过程中的膨胀提供了缓冲基质。此外，SnO 2的超小尺寸缩短了Li+/e−在SnO 2中的扩散长度。
The gram-scale synthesis of graphene based mesoporous SnO2composite (G-M-SnO2) has been successfully realized based on kirkendall effect. When used as anode for lithium ion batteries, it delivers a high reversible capacity of 1354 mAhg−1after 50 cycles at 100 mAg−1and excellent rate capability of 664 mAhg−1at 2 Ag−1. The outstanding lithium storage performance mainly results from the synergistic effect of the ultrasmall SnO2and conductive graphene nanoparticles, which not only enhanced the conductivity of the whole electrode but also provide buffer matrix for the expansion of SnO2nanoparticles during charge-discharge process. Furthermore, the ultra-small size of SnO2shortens the diffusion length of Li+/e−in SnO2.