960化工网
Interpenetrated N-rich MOF derived vesicular N-doped carbon for high performance lithium ion battery†
Yun-Xiu Zhao,Yuan-Wei Sun,Jun Li,Su-Na Wang,Da-Cheng Li,Jian-Min Dou,Ming Zhong,Hui-Yan Ma,Yun-Wu Li
Dalton Transactions Pub Date : 04/26/2022 00:00:00 , DOI:10.1039/D2DT00551D
Abstract

High-performance lithium ion batteries (LIBs) juggling high reversible capacity, excellent rate capability and ultralong cycle stability are urgently needed for all electronic devices. Here we report employing a vesicle-like porous N-doped carbon material (abbr. N/C-900) as a highly active anode for LIBs to balance high capacity, high rate and long life. The N/C-900 material was fabricated by pyrolysis of a designed crystal MOF LCU-104, which exhibits a graceful two-fold interpenetrating structural feature of N-rich nanocages {Zn6(dttz)4} linked through an N-donor ligand bpp (H3dttz = 4,5-di(1H-tetrazol-5-yl)-2H-1,2,3-triazole, bpp = 1,3-bis(4-pyridyl)propane). The features of LCU-104 combine high N content (35.1%), interpenetration, and explosive characteristics, which endow the derived N/C material with optimized N-doping for tuning its chemical and electronic structure, a suitably thicker wall to enhance its stability, and a vesicle-like structure to improve its porosity. As an anode material for LIBs, N/C-900 delivers a highly reversible capacity of ca. 734 mA h g−1 at a large current density of 1 A g−1 until the 2000th cycle, revealing its ultralong cycle stability and excellent rate capability. The unique structure and preferential interaction between abundant pyridinic N active sites and Li atoms are responsible for the improved excellent lithium storage capacity and durability performances of the anode according to analysis of the results of computational modeling.

Graphical abstract: Interpenetrated N-rich MOF derived vesicular N-doped carbon for high performance lithium ion battery
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