Huang Minsong, Yao Zhenguo, Yang Qifan, Li Chilin
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 585 He Shuo Road, Shanghai, 201899, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
Angew Chem Int Ed Engl. 2021 Jun 14;60(25):14040-14050. doi: 10.1002/anie.202102552. Epub 2021 May 11.
A dual modulation strategy of consecutive nucleation and confined growth of Li metal is proposed by using the metal-organic framework (MOF) derivative hollow capsule with inbuilt lithiophilic Au or Co-O nanoparticle (NP) seeds as heterogeneous host. The seeding-induced nucleation enables the negligible overpotential and promotes the inward injection of Li mass into the abundant cavities in host, followed by the conformal plating of Li on the outer surface of host during discharging. This modulation alleviates the dendrite growth and volume expansion of Li plating. The interconnected porous host network enables enhancement of cycling and rate performances of Li metal (a lifespan over 1200 h for Au-seeding symmetric cells, and an endurance of 220 cycles under an ultrahigh current density of 10 mA cm for corresponding asymmetric cells). The hollow capsules integrated with lithiophilic seeds solve the deformation problem of Li metal for durable and long-life Li-metal batteries.
通过使用内置亲锂金或钴 - 氧纳米颗粒（NP）种子的金属有机框架（MOF）衍生物中空胶囊作为异质主体，提出了一种锂金属连续成核和受限生长的双调制策略。种子诱导成核使过电位可忽略不计，并促进锂质量向内注入主体中丰富的空腔，随后在放电过程中锂在主体外表面进行保形电镀。这种调制减轻了锂电镀的枝晶生长和体积膨胀。相互连接的多孔主体网络增强了锂金属的循环和倍率性能（金种子对称电池的寿命超过1200小时，相应的非对称电池在10 mA cm的超高电流密度下可耐受220次循环）。集成亲锂种子的中空胶囊解决了锂金属的变形问题，实现了耐用且长寿命的锂金属电池。
