Green synthesis of a Se/HPCF-rGO composite for Li-Se batteries with excellent long-term cycling performance
Green synthesis of a Se/HPCF-rGO composite for Li-Se batteries with excellent long-term cycling performance
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绿色合成用于锂硒电池的Se/HPCF-rGO复合材料，具有优异的长期循环性能
DOI：
10.1039/c7ta06884k
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发表时间：
2017
影响因子：
11.9
通讯作者：
Wei Mingdeng
中科院分区：
文献类型：
--
作者：
Zeng Lingxing;Chen Xi;Liu Renpin;Lin Liangxu;Zheng Cheng;Xu Lihong;Luo Fenqiang;Qian Qingrong;Chen Qinghua;Wei Mingdeng
在本研究中，我们为硒储层设计了一种双空间碳保护策略，其中将硒/分层多孔碳纤维（Se/HPCF）复合材料均匀锚定在还原氧化石墨烯（Se/HPCF - rgo）上。以木质素磺酸钠（LN）为绿色成孔剂，采用静电纺丝法首次合成了具有高比表面积和大孔隙体积的高聚丙烯酸酯（HPCF）。Se/ HPCF-rGO复合材料作为锂硒电池正极材料表现出优异的电化学性能。例如，以0.2C的速率循环50次后，可保持616 mA h g−1的高可逆容量。更重要的是，即使在5000次循环后，Se/ HPCF-rGO复合材料在10C的高倍率下也能提供208 mA h g−1的高容量。优异的电化学性能可归因于多种结构特征的协同作用和锂储存的快速反应动力学。
In the present work, we designed a dual-spatial carbon protection strategy for a Se reservoir, in which a Se/hierarchical porous carbon fiber (Se/HPCF) composite was homogeneously anchored on reduced graphene oxide (Se/HPCF–rGO). HPCF with high specific surface area and large pore volume was synthesized for the first time by using sodium lignosulfonate (LN) as a green porogen based on an electrospinning route. The Se/HPCF–rGO composite exhibits excellent electrochemical performance when employed as a cathode material for Li–Se batteries. For instance, a high reversible capacity of 616 mA h g−1 was maintained after 50 cycles at a rate of 0.2C. More importantly, the Se/HPCF–rGO composite delivered a high capacity of 208 mA h g−1 at a high rate of 10C even after 5000 cycles. The outstanding electrochemical performance can be attributed to the synergistic effect of the diverse structural features and fast reaction kinetics for lithium storage.