A pomegranate‐like cathode, VN/S@G, is synthesized according to a simple principle of electrostatic attraction through a controllable Zeta potential method, establishing a hierarchical‐structured VN/S nanoclusters capsuled with graphene nanosheets. Interior VN nanoparticles trap lithium polysulphides (LiPSs) and catalyse them transform from long‐chain to short‐chain species; exterior cladding layers of graphene nanosheets confine the transformations in a nanoscale‐catalysis reactors. VN/S@G cathode exhibits excellent long‐cycling life at 2C rate during the 2000 cycles, corresponding to 0.038 percent of capacity fade per cycle. According to in‐situ Raman and electrochemical impedance spectroscopies, VN catalyst accelerates chemical transformations of liquid‐state LiPSs to solid‐state Li 2 S 2 /Li 2 S and graphene intensifies Li + diffusion behaviour. Improvement of electrochemical performance of the VN/S@G cathode depends on a coefficient of physical and chemical interactions between VN catalyst and LiPSs species.

中文翻译：

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通过控制Zeta电位用石墨烯封装的VN / S纳米簇：锂硫电池的石榴状阴极，具有增强的速率性能

通过可控的Zeta电位方法，根据简单的静电吸引原理，合成了石榴状的阴极VN / S @ G，建立了用石墨烯纳米片包裹的分层结构的VN / S纳米簇。内部的VN纳米颗粒捕获了多硫化锂（LiPS），并催化它们从长链物种转变为短链物种；石墨烯纳米片的外部包覆层将转变限制在纳米级催化反应器中。VN / S @ G阴极在2000次循环中以2C的速率表现出出色的长循环寿命，相当于每个循环容量衰减的0.038％。根据原位拉曼光谱和电化学阻抗谱，VN催化剂加速了液态LiPS向固态Li 2 S 2 / Li 2 S的化学转化，石墨烯增强了Li +的扩散行为。VN / S @ G阴极电化学性能的提高取决于VN催化剂与LiPSs物种之间的物理和化学相互作用系数。