Urchin‐shaped NiCo₂Se₄ (u‐NCSe) nanostructures as efficient sulfur hosts are synthesized to overcome the limitations of lithium–sulfur batteries (LSBs). u‐NCSe provides a beneficial hollow structure to relieve volumetric expansion, a superior electrical conductivity to improve electron transfer, a high polarity to promote absorption of lithium polysulfides (LiPS), and outstanding electrocatalytic activity to accelerate LiPS conversion kinetics. Owing to these excellent qualities as cathode for LSBs, S@u‐NCSe delivers outstanding initial capacities up to 1403 mAh g⁻¹ at 0.1 C and retains 626 mAh g⁻¹ at 5 C with exceptional rate performance. More significantly, a very low capacity decay rate of only 0.016% per cycle is obtained after 2000 cycles at 3 C. Even at high sulfur loading (3.2 mg cm⁻²), a reversible capacity of 557 mAh g⁻¹ is delivered after 600 cycles at 1 C. Density functional theory calculations further confirm the strong interaction between NCSe and LiPS, and cytotoxicity measurements prove the biocompatibility of NCSe. This work not only demonstrates that transition metal selenides can be promising candidates as sulfur host materials, but also provides a strategy for the rational design and the development of LSBs with long‐life and high‐rate electrochemical performance.

中文翻译：

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高性能锂硫电池在类似Urchin的金属NiCo2Se4中具有高催化活性和高效的极性管状纳米结构

合成了Urchin形的NiCo ₂ Se ₄（u-NCSe）纳米结构作为有效的硫主体，以克服锂硫电池（LSB）的局限性。u-NCSe提供有益的空心结构以减轻体积膨胀，提供优异的电导率以改善电子传递，提供高极性以促进多硫化锂（LiPS）的吸收，并具有出色的电催化活性以加速LiPS转化动力学。由于具有出色的LSB阴极品质，S @ u‐NCSe在0.1 C时可提供高达1403 mAh g ^-1的出色初始容量，并保留626 mAh g ^-1在5 C下具有出色的速率性能。更重要的是，在3 C下经过2000次循环后，每个循环仅获得非常低的容量衰减率，仅为0.016％。即使在高硫负荷下（3.2 mg cm ^-2），在600次循环后仍可提供557 mAh g ^-1的可逆容量。密度泛函理论计算进一步证实了NCSe与LiPS之间的强相互作用，并且细胞毒性测量证明了NCSe的生物相容性。这项工作不仅证明过渡金属硒化物有望作为硫基质材料，而且还为合理设计和开发具有长寿命和高速率电化学性能的LSB提供了策略。