Controllable synthesis of carbon-coated SnSnO2carbon-nanofiber membrane as advanced binder-free anode for lithium-ion batteries
Controllable synthesis of carbon-coated SnSnO2carbon-nanofiber membrane as advanced binder-free anode for lithium-ion batteries
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DOI：
10.1016/j.electacta.2015.12.062
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发表时间：
2016-01
影响因子：
6.6
通讯作者：
Zhen Shen;Yi Hu;Yan-li Chen;Renzhong Chen;Xia He;Xiangwu Zhang;Hanfeng Shao;Yan Zhang
中科院分区：
文献类型：
--
作者：
Zhen Shen;Yi Hu;Yan-li Chen;Renzhong Chen;Xia He;Xiangwu Zhang;Hanfeng Shao;Yan Zhang
采用静电纺丝、炭化和低温水热处理的方法制备了由Sn、SnO 2和多孔碳纳米管膜（Sn <$SnO2 <$CNF@C）组成的碳包覆复合材料。以蔗糖为碳源，通过调节蔗糖浓度，可以很好地控制碳覆盖层的厚度。这种三维（3D）网状结构允许Sn/SnO 2/CNF@C膜直接用作锂离子电池的阳极，而无需添加任何聚合物粘合剂或电导体。该材料的复合电极在0.8A g·cm-1的高电流密度下200次循环后表现出712.2mA h·g·cm-1的高放电容量，以及良好的循环稳定性和优异的倍率性能，这可以归因于由保护性碳涂层和3D碳包覆膜提供的Sn/SnO 2颗粒的改善的电化学性能。因此，该复合材料可广泛用作高电流可充电锂离子电池中的高级无粘合剂阳极材料，并扩展到柔性电极的制造。
A carbon-coated composite consisting of Sn, SnO2, and porous carbon-nanofiber membrane (Sn⿿SnO2⿿CNF@C) was successfully prepared via electrospinning followed by carbonization and low-temperature hydrothermal treatment. The thickness of the carbon overlayer formed by using sucrose as the carbon source could be well controlled by adjusting the sucrose concentration. The three-dimensional (3D) nanofiber network structure allowed the Sn⿿SnO2⿿CNF@C membrane to be used directly as an anode in lithium-ion batteries without adding any polymer binders or electrical conductors. The composite electrodes of this material exhibited a high discharge capacity of 712.2 mA h g⿿1at a high current density of 0.8 A g⿿1after 200 cycles, as well as good cycling stability and excellent rate capability, which can be ascribed to the improved electrochemical properties of the Sn⿿SnO2particles provided by the protective carbon coating and the 3D carbon nanofiber membrane. The composite can thus be widely used as an advanced binder-free anode material in high-current rechargeable lithium-ion batteries and extended to the fabrication of flexible electrodes.