Lithium–sulfur (Li–S) batteries are of great interest due to their high theoretical energy density. However, one of the key issues hindering their real world applications is polysulfide shuttle, which results in severe capacity decay and self‐discharge. Here, a laponite nanosheets/carbon black coated Celgard (LNS/CB‐Celgard) separator to inhibit polysulfide shuttle and to enhance the Li⁺ conductivity simultaneously is reported. The polysulfide shuttle is efficiently inhibited through strong interactions between the O active sites of the LNS and polysulfides by forming the Li···O and OS bonds. Moreover, the separator features high Li⁺ conductivity, fast Li⁺ diffusion, excellent electrolyte wettability, and high thermal stability. Consequently, the Li–S batteries with the LNS/CB‐Celgard separator and the pure S cathode show a high initial reversible capacity of 1387 mA h g⁻¹ at 0.1 C, high rate performance, superior cycling stability (with a capacity decay rate of 0.06% cycle⁻¹ at 0.2 C and 0.028% cycle⁻¹ at 1.0 C over 500 cycles), and ultralow self‐discharge. The separator could also enhance the performance of other batteries such as the LiFePO₄/separator/Li battery. This work sheds a new light on the design and preparation of novel separators for highly stable Li–S batteries via a “green” and cost‐effective approach.

中文翻译：

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基于锂皂石纳米片涂层的Celgard隔膜的高度稳定的锂硫电池

锂硫（Li–S）电池由于其较高的理论能量密度而备受关注。但是，阻碍其在现实世界中应用的关键问题之一是多硫化物梭，这会导致严重的容量衰减和自放电。在此报道了一种合成锂皂石纳米片/炭黑的Celgard（LNS / CB-Celgard）隔膜，可抑制多硫化物的穿梭并同时增强Li ^+的电导率。通过形成Li··O和OS键，LNS的O活性位点与多硫化物之间的强相互作用可有效抑制多硫化物的穿梭。此外，隔膜具有高Li ⁺电导率，快Li ⁺扩散，优异的电解质润湿性和高热稳定性。因此，具有LNS / CB-Celgard隔膜和纯S阴极的Li-S电池在0.1 C的条件下显示出1387 mA hg ^-1的高初始可逆容量，高倍率性能，出色的循环稳定性（容量衰减率达5％）。在500个循环中，在0.2 C时为0.06％循环^-1和在1.0 C时为0.028％循环^-1（超低自放电）。隔板还可以增强其他电池的性能，例如LiFePO ₄ /隔板/ Li电池。这项工作通过一种“绿色”且具有成本效益的方法，为高度稳定的Li-S电池的新型隔膜的设计和制备提供了新的思路。