具有硫酸锂阻挡层的纳米结构S@VACNTs正极用于锂硫电池中异常稳定的循环
Nanostructured S@VACNTs Cathode with Lithium Sulfate Barrier Layer for Exceptionally Stable Cycling in Lithium-Sulfur Batteries
AI总结：
本文通过在垂直排列碳纳米管上负载硫并引入硫酸锂阻挡层，开发了无粘结剂S@VACNTs正极，有效抑制多硫化物穿梭，在1 C下1600次循环后仍保持0.9 mAh cm⁻²的可逆面积容量，并组装了Si-Li-S全电池验证其应用潜力。
摘要：
锂硫技术由于硫具有更高的比容量、成本效益和环境友好特性而引起了广泛关注。然而，硫的绝缘性和较差的循环寿命阻碍了其实际应用。为了解决这一问题，对传统硫电极结构进行了简单改进，旨在实现高容量、长循环寿命和快速充电速率。利用垂直排列碳纳米管（CNTs）修饰硫并构建硫酸锂阻挡层，开发了无粘结剂硫正极材料。排列的CNT框架为电子传输提供了高导电性，并提供了短的锂离子路径。同时，硫酸盐阻挡层显著抑制了多硫化物的穿梭效应。具有Li 2 SO 4 涂层的S@VACNTs在1 C下经过1600次循环后表现出极其稳定的可逆面积容量0.9 mAh cm --2 ，在1200次循环后容量保持率为80%，比在相同倍率下循环的磷酸铁锂正极高出三倍以上。考虑到与锂枝晶形成相关的安全问题，组装了Si-Li-S全电池，在长达100次循环中表现出良好的电化学性能。将使用1D导电支架的先进电极结构与高比容量活性材料相结合，并实施抑制多硫化物的新策略，极大地提高了Li-S电池的稳定性和性能。
英文摘要：
Lithium-sulfur technology garners significant interest due to sulfur's higher specific capacity, cost-effectiveness, and environmentally friendly aspects. However, sulfur's insulating nature and poor cycle life hinder practical application. To address this, a simple modification to the traditional sulfur electrode configuration is implemented, aiming to achieve high capacity, long cycle life, and rapid charge rates. Binder-free sulfur cathode materials are developed using vertically aligned carbon nanotubes (CNTs) decorated with sulfur and a lithium sulfate barrier layer. The aligned CNT framework provides high conductivity for electron transportation and short lithium-ion pathways. Simultaneously, the sulfate barrier layer significantly suppresses the shuttle of polysulfides. The S@VACNTs with Li 2 SO 4 coating exhibit an extremely stable reversible areal capacity of 0.9 mAh cm --2 after 1600 cycles at 1 C with a capacity retention of 80% after 1200 cycles, over three times higher than lithium iron phosphate cathodes cycled at the same rate. Considering safety concerns related to the formation of lithium dendrite, a full cell Si-Li-S is assembled, displaying good electrochemical performances for up to 100 cycles. The combination of advanced electrode architecture using 1D conductive scaffold with high-specific-capacity active material and the implementation of a novel strategy to suppress polysulfides drastically improves the stability and the performance of Li-S batteries.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
