Ma Yitian, Qu Wenjie, Hu Xin, Qian Ji, Li Yu, Li Li, Lu Hai, Du Huiling, Wu Feng, Chen Renjie
School of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an 710054, China.
Shanghai Institute of Space Power-Sources, Shanghai 200245, China.
ACS Appl Mater Interfaces. 2022 Oct 5;14(39):44338-44344. doi: 10.1021/acsami.2c11380. Epub 2022 Sep 23.
In lithium metal batteries (LMB), unrestricted growth of lithium dendrites will pierce the separator and cause an internal short circuit. Therefore, we designed modified separator with an InN thin layer, which could be in situ converted into a binary mixed-modified layer of Li-In alloy and LiN during the lithium plating/stripping process. Among them, Li-In alloy induces the lateral growth of lithium dendrites and prevents the separator from being pierced; LiN balances ion distribution at the lithium anode/separator interface, which is beneficial to inhibit the growth of lithium dendrites. Under the synergistic effect of the two phases, the performance of LMBs was obviously improved. In addition, the separator modification does not need to be carried out in a protective atmosphere and is suitable for large-scale roll-to-roll processing.
在锂金属电池（LMB）中，锂枝晶的无限制生长会刺穿隔膜并导致内部短路。因此，我们设计了一种带有InN薄层的改性隔膜，该薄层在锂电镀/剥离过程中可原位转化为Li-In合金和LiN的二元混合改性层。其中，Li-In合金促使锂枝晶横向生长，防止隔膜被刺穿；LiN平衡锂阳极/隔膜界面处的离子分布，这有利于抑制锂枝晶的生长。在两相的协同作用下，LMB的性能得到明显改善。此外，隔膜改性无需在保护气氛中进行，适用于大规模卷对卷加工。
