Three-Dimensional Hierarchical Constructs of MOF-on-Reduced Graphene Oxide for Lithium-Sulfur Batteries.,Chemistry - An Asian Journal

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Three-Dimensional Hierarchical Constructs of MOF-on-Reduced Graphene Oxide for Lithium-Sulfur Batteries.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2019-08-23 , DOI: 10.1002/asia.201900848
Yushan Wu ₁ , Haoqing Jiang ₂ , Fu-Sheng Ke ₁ , Hexiang Deng _{1,

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Affiliation

A three-dimensional (3D) hierarchical MOF-on-reduced graphene oxide (MOF-on-rGO) compartment was successfully synthesized through an in situ reduced and combined process. The unique properties of the MOF-on-rGO compartment combining the polarity and porous features of MOFs with the high conductivity of rGO make it an ideal candidate as a sulfur host in lithium-sulfur (Li-S) batteries. A high initial discharge capacity of 1250 mAh g-1 at a current density of 0.1 C (1.0 C=1675 mAh g-1 ) was reached using the MOF-on-rGO based electrode. At the rate of 1.0 C, a high specific capacity of 601 mAh g-1 was still maintained after 400 discharge-charge cycles, which could be ascribed to the synergistic effect between MOFs and rGO. Both the hierarchical structures of rGO and the polar pore environment of MOF retard the diffusion and migration of soluble polysulfide, contributing to a stable cycling performance. Moreover, the spongy-layered rGO can buffer the volume expansion and contraction changes, thus supplying stable structures for Li-S batteries.

中文翻译：

锂硫电池MOF还原氧化石墨烯的三维层次结构。

通过原位还原和组合过程成功地合成了三维（3D）分层MOF-on-reduce氧化石墨烯（MOF-on-rGO）隔室。MOF-on-rGO隔室的独特性能结合了MOF的极性和多孔特性以及rGO的高电导率，使其成为锂硫（Li-S）电池中硫主体的理想选择。使用基于rGO的MOF电极，在0.1 C（1.0 C = 1675 mAh g-1）的电流密度下可获得1250 mAh g-1的高初始放电容量。在1.0 C的速率下，经过400次放电后仍保持601 mAh g-1的高比容量，这可归因于MOF和rGO之间的协同作用。rGO的层次结构和MOF的极性孔环境都阻碍了可溶性多硫化物的扩散和迁移，从而有助于稳定的循环性能。而且，海绵状的rGO可以缓冲体积的膨胀和收缩变化，从而为Li-S电池提供稳定的结构。

更新日期：2019-08-23

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