Gao Rui-Min, Yang Hua, Wang Cao-Yu, Ye Huan, Cao Fei-Fei, Guo Zai-Ping
College of Science, Huazhong Agricultural University, Wuhan, 430070, P. R. China.
School of Chemical Engineering & Advanced Materials, The University of Adelaide, Adelaide, SA, 5005, Australia.
Angew Chem Int Ed Engl. 2021 Nov 22;60(48):25508-25513. doi: 10.1002/anie.202111199. Epub 2021 Oct 25.
The plating/stripping of Li dendrites can fracture the static solid electrolyte interphase (SEI) and cause significant dynamic volume variations in the Li anode, which give rise to poor cyclability and severe safety hazards. Herein, a tough polymer with a slide-ring structure was designed as a self-adaptive interfacial layer for Li anodes. The slide-ring polymer with a dynamically crosslinked network moves freely while maintaining its toughness and fracture resistance, which allows it can to dissipate the tension induced by Li dendrites on the interphase layer. Moreover, the slide-ring polymer is highly stretchable, elastic, and displays an ultrafast self-healing ability, which allows even pulverized Li to remain coalesced without disintegrating upon consecutive cycling. The Li anodes demonstrate greatly improved suppression of Li dendrite formation, as evidenced by the high critical current density (6 mA cm ) and stable cycling for the full cells with high-areal capacity LiFePO , high-voltage NCM, and S cathodes.
锂枝晶的电镀/剥离会破坏静态固体电解质界面（SEI），并导致锂阳极出现显著的动态体积变化，从而导致循环性能不佳和严重的安全隐患。在此，设计了一种具有滑环结构的坚韧聚合物作为锂阳极的自适应界面层。具有动态交联网络的滑环聚合物在保持其韧性和抗断裂性的同时能够自由移动，这使得它能够消散锂枝晶在界面层上引起的张力。此外，滑环聚合物具有高度的可拉伸性、弹性，并表现出超快的自愈能力，这使得即使是粉碎的锂在连续循环时也能保持聚结而不分解。锂阳极对锂枝晶形成的抑制作用有了很大改善，高临界电流密度（6 mA cm ）以及与高面容量磷酸铁锂、高压镍钴锰酸锂和硫阴极的全电池稳定循环证明了这一点。
