Ren Y X, Wei L, Jiang H R, Zhao C, Zhao T S
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
ACS Appl Mater Interfaces. 2020 Dec 2;12(48):53860-53868. doi: 10.1021/acsami.0c17576. Epub 2020 Nov 17.
The rechargeability of the lithium anode in lithium-sulfur (Li-S) batteries is an issue for this type of battery. In this work, we demonstrate a Li-S full battery comprising a protected anode scaffold and a LiS cathode. The stabilized performance is attained by an on-site fluorination strategy, using BiF for the interfacial coating of the anode. Unlike previously reported LiF protective coating derived from the vapor/solution depositions, BiF nanocrystals would be lithiated on-site to the anode surface and server as the protective layer. The chemically inertial LiBi alloy can provide additional ion-conductive paths and stitch the LiF to form a seamless protective layer, thereby suppressing the dendrite propagation and parasitic reactions effectively. With the designed anode structures and compositions, the high-loading full battery (8.05 mg cm) can achieve an exceptional utilization of both sulfur (898 mAh g) and lithium (1533 mAh g) over 200 cycles, marking a step toward cyclable Li metal batteries at a high capacity.
锂硫（Li-S）电池中锂负极的可再充电性是这类电池面临的一个问题。在这项工作中，我们展示了一种由受保护的负极支架和LiS正极组成的Li-S全电池。通过现场氟化策略实现了稳定的性能，使用BiF对负极进行界面涂层。与先前报道的通过气相/溶液沉积得到的LiF保护涂层不同，BiF纳米晶体将在现场锂化到负极表面并作为保护层。化学惰性的LiBi合金可以提供额外的离子传导路径并缝合LiF以形成无缝保护层，从而有效抑制枝晶生长和寄生反应。通过设计的负极结构和组成，高负载全电池（8.05 mg cm）在200次循环中可以实现硫（898 mAh g）和锂（1533 mAh g）的出色利用率，朝着高容量可循环锂金属电池迈出了一步。
