Hierarchical porous reduced graphene oxide/SnO2 networks as highly stable anodes for lithium-ion batteries
Hierarchical porous reduced graphene oxide/SnO2 networks as highly stable anodes for lithium-ion batteries
复制标题
分级多孔还原氧化石墨烯/SnO2网络作为锂离子电池的高度稳定阳极
DOI：
10.1016/j.electacta.2016.04.151
复制
发表时间：
2016
影响因子：
6.6
通讯作者：
Li-Zhen Fan
中科院分区：
文献类型：
--
作者：
Dan Zhou;Wei-Li Song;Xiaogang Li;Li-Zhen Fan
可充电锂离子电池（lib）由于其高能量密度而成为各种能源应用中具有竞争力的电化学电源。为了适应高性能锂离子电池电极材料的发展，氧化锡（SnO2）阳极具有较高的理论容量，具有广阔的应用前景。本文采用二氧化硅模板辅助纳米铸造工艺，将多孔氧化石墨烯锚定在石墨烯支架上，构建了新型分层多孔还原氧化石墨烯/SnO2（rGO/SnO2）网络。所合成的多孔rGO/ sno2网络电导率提高，有利于电子传递，也为氧化还原反应提供了足够的活性位点，同时适应循环过程中较大的体积变化。作为锂离子电池的阳极材料，这种多孔氧化石墨烯/ sno2复合材料具有显著增强的循环稳定性和速率容量。此外，该阳极具有高度稳定的循环性能，在600 mA g - 1和1000 mA g - 1下，放电容量分别为595 mAh g - 1（经过300次循环）和394 mAh g - 1（经过800次循环）。该策略为制造先进的锂离子电池阳极材料提供了一条有前途的途径。
Rechargeable lithium-ion batteries (LIBs) have been explored as competitive electrochemical power sources for various energy applications due to their high energy density. To meet to the development of high-performance electrode materials for LIBs, tin oxide (SnO2) anodes demonstrate promising prospects for their high theoretical capacities. In this paper, novel hierarchical porous reduced graphene oxide/SnO2(rGO/SnO2) networks that consist of porous SnO2anchored on graphene scaffold are constructed by a silica template assisted nanocasting process. The as-synthesized porous rGO/SnO2networks of improved electrical conductivity can facilitate the electron transport and also provide sufficient active sites for redox reactions, along with accommodating the large volume changes during cycling process. As an anode material for LIBs, such porous rGO/SnO2composite exhibits substantially enhanced cycling stability and rate capacity. In addition, the anode suggests highly stable cycling performance with the discharge capacities of 595 mAh g−1(after 300 cycles) and 394 mAh g−1(after 800 cycles) at 600 mA g−1and 1000 mA g−1, respectively. The strategy indicates a promising way to fabricate advanced anode materials for LIBs.