Despite being as next-generation energy storage systems with ultra-high theoretical energy density of 2600 Wh kg−1, lithium-sulfur (Li-S) batteries face serious hurdles due to the sluggish redox kinetics in S cathodes and uncontrollable growth of dendrites in Li anodes. To simultaneously address such issues, herein, we present an interface engineering strategy to develop a dual-functional host for S cathode and Li anode, which is constructed by heterostructural WC-WN0.67 quantum dots homogeneously embedded in N-doped graphene nanosheets (WC-WN0.67@NG). As a result, the Li-S full batteries deliver a high reversible capacity of 704 mA h g−1 even at a high rate of 4 C, and demonstrate a long-term cycling stability even at 2 C with a low degradation rate of 0.027 % over 1200 cycles. This work paves the way to facilitate the practical applications of Li-S batteries through interface engineering of dual-functional heterostructural quantum-dot host.

中文翻译：

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面向高倍率和长寿命锂硫满电池的异质结构量子点界面工程


尽管锂硫 （Li-S） 电池是具有 2600 Wh kg-1 的超高理论能量密度的下一代储能系统，但由于 S 阴极中的氧化还原动力学缓慢和锂负极中枝晶的生长不受控制，它面临着严重的障碍。为了同时解决这些问题，本文提出了一种界面工程策略，以开发 S 阴极和 Li 负极的双功能主体，该策略由均匀嵌入 N 掺杂石墨烯纳米片 （WC-WN0.67@NG） 中的异质结构 WC-WN0.67 量子点构建。因此，锂硫满电池即使在 4 C 的高倍率下也能提供 704 mA h g-1 的高可逆容量，即使在 2 C 下也表现出长期循环稳定性，在 1200 次循环中具有 0.027% 的低衰减率。这项工作通过双功能异质结构量子点主体的界面工程为促进 Li-S 电池的实际应用铺平了道路。