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Infixing NiS2 nanospheres into a three‐dimensional rGO/CNTs‐Li carbon composite as superior electrocatalyst for high‐performance Li−S batteries
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-04-15 , DOI: 10.1002/cnma.202000120 Juan Wang 1 , Jie Xu 1 , Weiqiang Tang 1 , Dongfang Niu 1 , Shuangliang Zhao 1 , Shuozhen Hu 1 , Xinsheng Zhang 1
ChemNanoMat ( IF 2.6 ) Pub Date : 2020-04-15 , DOI: 10.1002/cnma.202000120 Juan Wang 1 , Jie Xu 1 , Weiqiang Tang 1 , Dongfang Niu 1 , Shuangliang Zhao 1 , Shuozhen Hu 1 , Xinsheng Zhang 1
Affiliation
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A novel flexible three‐dimensional (3D) architecture of lithiated carbon nanotubes (CNTs‐Li) interlacing reduced graphene oxide (rGO) loaded with NiS2 (denoted as NiS2@rGO/CNTs‐Li) was rationally designed and implemented as interlayer with dual functions to suppress lithium polysulfides (LiPSs) shuttle and enhance redox kinetics for high‐performance Li−S batteries. In our design, the introduced rGO and CNTs‐Li serve as the conductive skeleton for facilitating the fast electron/ion transfer, while the infixing NiS2 catalyst could synchronously entrap the soluble LiPSs and speed up their interconversion. The chemical interaction between NiS2 and LiPSs and the redox kinetics were probed by density functional theory (DFT) calculations and electrochemical measurements, respectively. Benefiting from the synergistic effect of 3D conductive skeleton and polar NiS2 catalyst, the cell with the NiS2@rGO/CNTs‐Li modified separator exhibits a high initial capacity of 1515 mA h g−1 at 0.2 C and an excellent long‐term cycling stability up to 600 cycles with a low decay rate of 0.071% at 2.0 C.
中文翻译：
将NiS2纳米球固定在三维rGO / CNTs-Li碳复合材料中，作为高性能Li-S电池的优异电催化剂
合理设计了一种新型的柔性三维（3D）结构的锂碳纳米管（CNTs-Li）交织了负载NiS 2的还原氧化石墨烯（rGO）（表示为NiS 2 @ rGO / CNTs-Li），并作为中间层实现。双重功能可抑制高性能锂电池的多硫化锂（LiPS）穿梭并增强氧化还原动力学。在我们的设计中，引入的rGO和CNTs-Li用作促进快速电子/离子转移的导电骨架，而固定型NiS 2催化剂可以同步截留可溶性LiPS，并加快它们的相互转化。NiS 2之间的化学相互作用LiPSs和氧化还原动力学分别通过密度泛函理论（DFT）计算和电化学测量来探究。得益于3D导电骨架和极性NiS 2催化剂的协同作用，带有NiS 2 @ rGO / CNTs-Li改性隔膜的电池在0.2 C时具有1515 mA h g -1的高初始容量，并具有出色的长期循环稳定性最高可达600个周期，在2.0 C下的衰减率仅为0.071％。
更新日期：2020-04-15
中文翻译：
将NiS2纳米球固定在三维rGO / CNTs-Li碳复合材料中，作为高性能Li-S电池的优异电催化剂
合理设计了一种新型的柔性三维（3D）结构的锂碳纳米管（CNTs-Li）交织了负载NiS 2的还原氧化石墨烯（rGO）（表示为NiS 2 @ rGO / CNTs-Li），并作为中间层实现。双重功能可抑制高性能锂电池的多硫化锂（LiPS）穿梭并增强氧化还原动力学。在我们的设计中，引入的rGO和CNTs-Li用作促进快速电子/离子转移的导电骨架，而固定型NiS 2催化剂可以同步截留可溶性LiPS，并加快它们的相互转化。NiS 2之间的化学相互作用LiPSs和氧化还原动力学分别通过密度泛函理论（DFT）计算和电化学测量来探究。得益于3D导电骨架和极性NiS 2催化剂的协同作用，带有NiS 2 @ rGO / CNTs-Li改性隔膜的电池在0.2 C时具有1515 mA h g -1的高初始容量，并具有出色的长期循环稳定性最高可达600个周期，在2.0 C下的衰减率仅为0.071％。
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