Three-dimensional sulfur/graphene multifunctional hybrid sponges for lithium-sulfur batteries with large areal mass loading.
Three-dimensional sulfur/graphene multifunctional hybrid sponges for lithium-sulfur batteries with large areal mass loading.
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用于大面积质量负载锂硫电池的三维硫/石墨烯多功能混合海绵。
DOI：
10.1038/srep04629
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发表时间：
2014-04-10
影响因子：
4.6
通讯作者：
Li Y
中科院分区：
文献类型：
--
作者：
Lu S;Chen Y;Wu X;Wang Z;Li Y
在本次交流中，我们引入了三维（3D）电池电极的概念，以提高锂硫电池单位面积的容量。在这种电池中，直接使用嵌入多孔石墨烯海绵（S-GS）中的硫的3D电极作为阴极，硫的面积质量负载量大（12 mg cm−2），大约比大多数报道大6-12倍。石墨烯海绵（GS）作为框架，可以提供高电子导电网络、吸收多硫化物中间体的能力，同时提供机械支撑以适应充电和放电过程中的体积变化。结果，硫含量为80 wt.%的S-GS电极在第11次循环时可提供高达6.0 mAh cm−2的极高面积比电容，并在0.1C倍率下经过300次充放电循环后仍保持4.2 mAh cm−2，表现出极低的衰减率（300次循环后每次循环为0.08%），这可能是同类产品中具有可比循环稳定性的最高面积比容量。 曾报道过可充电锂/硫电池。
In this communication, we introduce the concept of three dimensional (3D) battery electrodes to enhance the capacity per footprint area for lithium-sulfur battery. In such a battery, 3D electrode of sulfur embedded into porous graphene sponges (S-GS) was directly used as the cathode with large areal mass loading of sulfur (12 mg cm−2), approximately 6–12 times larger than that of most reports. The graphene sponges (GS) worked as a framework that can provide high electronic conductive network, abilities to absorb the polysulfides intermediate, and meanwhile mechanical support to accommodate the volume changes during charge and discharge. As a result, the S-GS electrode with 80 wt.% sulfur can deliver an extremely high areal specific capacitance of 6.0 mAh cm−2 of the 11th cycle, and maintain 4.2 mAh cm−2 after 300 charge−discharge cycles at a rate of 0.1C, representing an extremely low decay rate (0.08% per cycle after 300 cycles), which could be the highest areal specific capacity with comparable cycle stability among the rechargeable Li/S batteries reported ever.
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