Ultrathin Manganese-Based Metal–Organic Framework Nanosheets: Low-Cost and Energy-Dense Lithium Storage Anodes with the Coexistence of Metal and Ligand Redox Activities

• DOI: 10.1021/acsami.7b09363
• Publication Date: 2017-08-16T13:30:14Z
• Authors: Chao Li; Xiaoshi Hu; Wei Tong; Wensheng Yan; Xiaobing Lou; Ming Shen; Bingwen Hu
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

We herein demonstrate the fabrication of Mn- and Ni-based ultrathin metal-organic framework nanosheets with same coordination mode (termed "Mn-UMOFNs" "Ni-UMOFNs", respectively) through an expedient versatile ultrasonic approach scrutinize their electrochemical properties as anode materials for rechargeable lithium batteries first time. The obtained Mn-UMOFNs structure advantages over Ni-UMOFNs (thinner nanosheets, smaller metal-ion radius, higher specific surface area) exhibit high reversible capacity (1187 mAh g-1 at 100 mA cycles), excellent rate capability (701 even 2 A g-1), rapid Li+ diffusion coefficient (2.48 × 10-9 cm2 s-1), a reasonable charge-discharge profile low average operating potential 0.4 V. On grounds low-cost environmental benignity Mn metals terephthalic acid linkers, our show alluring promise high-energy material future LIBs. Furthermore, lithiation-delithiation chemistry was unequivocally studied by combination magnetic measurements, electron paramagnetic resonance, synchrotron-based soft X-ray spectroscopy (O K-edge L-edge) experiments, results which substantiate that both aromatic chelating ligands Mn2+ centers participate in storage.