Enhancing Lithium-Storage Performance via Graphdiyne/Graphene Interface by Self-Supporting Framework Synthesized
| Autor: | Zhifeng Zheng, Xiaoling Zhan, Lanqing Xu, Jiaxin Li, Jingyan Zhong, Huifang Kang, Yongping Zheng, Binchang Hua |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | ACS Applied Materials & Interfaces. 13:34332-34340 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.1c08164 |
| Popis: | The self-supporting graphdiyne/exfoliated graphene (GDY/EG) composites materials were prepared by the solvothermal method and applied as lithium-ion batteries (LIBs). Graphdiyne (GDY) is a new type of carbon allotrope with a natural macroporous structure, but its conductivity is poor. A small amount of highly conductive graphene can improve surface conductivity and facilitate electron transport. The layered GDY/graphene heterogeneous interface can reduce the electron aggregation polarization, enhance the ability to obtain electrons from the electrolyte, and form a more uniform solid-electrolyte interface (SEI) film. The structural performance and electrochemical performance have been systematically studied. The results showed that the GDY/EG composite electrode has a reversible capacity of 1253 mA h g-1 after 600 cycles at a current density of 0.5 A g-1. When the current density is 5 A g-1, the GDY/EG composite electrode can still maintain a reversible capacity of 324 mA h g-1 after 2000 cycles, and the electrode can still maintain a good morphology after recycling. GDY/EG has a high reversible capacity, excellent rate capability, and cycle stability. A small amount of EG and inner foam copper form a double-layer conductivity, which changes the storage method of lithium ions and facilitates the rapid diffusion of lithium ions. |
| Databáze: | OpenAIRE |
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