Regulating Uniform Li Plating/Stripping via Dual‐Conductive Metal‐Organic Frameworks for High‐Rate Lithium Metal Batteries. (26th February 2020)

• Record Type: Journal Article
• Authors: Wang, Tian‐Shi; Liu, Xiaobin; Zhao, Xudong; He, Pingge; Nan, Ce‐Wen; Fan, Li‐Zhen
• Is Part Of: Advanced functional materials. Volume 30:Number 16(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-02-26
• Subjects: dendrite‐free electrodes -- lithium metal batteries -- metal‐organic frameworks -- rate performance; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202000786
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Lithium metal anodes show immense scope for application in high‐energy electronics and electric vehicles. Unfortunately, lithium dendrite growth and volume change leading to short lifespan and safety issues severely limit the feasibility of lithium metal batteries. A rational design of metal–organic framework (MOF)‐modified Li metal anode with optimized Li plating/stripping behavior via one‐step carbonization of ZIF‐67 is proposed. Experimental and theoretical simulation results reveal that carbonized MOFs with uniformly dispersed Co nanoparticles in N‐graphene (Co@N‐G) exhibit an electronic/ionic dual‐conductivity and significantly improved affinity with Li, and so serve as an ideal host for dendrite‐free lithium deposition, consequently leading to uniform lithium plating/stripping during cycling. As a result, the anode delivers highly stable cyclic performance with high coulombic efficiency (CE) at ultrahigh current densities (CE = 91.5% after 130 cycles at 10 mA cm −2, and CE = 90.4% after 80 cycles at 15 mA cm −2 ). Moreover, the practical applicability and functionality of such anodes are demonstrated through assembly of Li‐Co@N‐G/NCM full batteries exhibiting a long cycle life of 100 cycles with a high capacity retention of 92% at 1 C. Abstract : High‐rate dendrite‐free lithium anodes can be achieved through Co‐embedded N‐doped graphene (Co@N‐G) modification. A rational design for metal–organic‐framework‐modified Li metal anodes is proposed via one‐step carbonization of ZIF‐67. Owing to the improved affinity with Li, electronic/ionic dual‐conductivity, and stable rhombic‐dodecahedron structure, Co@N‐G can decrease Li + nucleation barriers, regulate Li plating/stripping behavior, and withstand high current densities.