Affiliation:
1. State Key Laboratory of Environment‐Friendly Energy Materials School of Materials and Chemistry Southwest University of Science and Technology Mianyang Sichuan 621010 China
2. Engineering Research Center of Alternative Energy Materials & Devices Ministry of Education College of Materials Science and Engineering Sichuan University Chengdu Sichuan 610064 P. R. China
3. Environmental and Climate Technology Korea Institute of Energy Technology (KENTECH) 200 Hyeoksin‐ro Naju 58330 Republic of Korea
Abstract
AbstractOrganic frameworks‐based batteries with excellent physicochemical stability and long‐term high capacity will definitely reduce the cost, carbon emissions, and metal consumption and contamination. Here, an ultra‐stable and ultra‐thin perylene‐dicyandiamide‐based hydrogen organic framework (HOF) nanosheet (P‐DCD) of ≈3.5 nm in thickness is developed. When applied in the cathode, the P‐DCD exhibits exceptional long‐term capacity retention for alkali‐ion batteries (AIBs). Strikingly, for lithium‐ion batteries (LIBs), at current of 2 A g−1, the large reversible capacity of 108 mA h g−1 shows no attenuation within 5 000 cycles. For sodium‐ion batteries (SIBs), the related capacity retains 91.7% within 10 000 cycles compared to the initial state, significantly much more stable than conventional organic materials reported previously. Mechanism studies through ex situ and in situ experiments and theoretical density functional theory (DFT) calculations reveal that the impressive long‐term performance retention originates from the large electron delocalization, fast ion diffusion, and physicochemical stability within the ultra‐thin 2D P‐DCD, featuring π‐π and hydrogen bonding stacking, nitrogen‐rich units, and low impedance. The advantageous features demonstrate that rationally designed stable and effective organic frameworks pave the way to utilizing complete organic materials for developing next‐generation low‐cost and highly stable energy storage batteries.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Sichuan Province
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
2 articles.
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