Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202202342
Keywords
electrostatic self-assemblies; flexible; heterostructures; MnO nano-cabbages; lithium-ion capacitors
Categories
Funding
- National Natural Science Foundation of China [52077207, 51907193, 51822706, 51677182, 51872283]
- Beijing Natural Science Foundation [JQ19012]
- Key Research Program of Frontier Sciences, CAS [ZDBS-LY-JSC047]
- Youth Innovation Promotion Association CAS [2020145]
- Dalian National Laboratory for Clean Energy Cooperation Fund
- CAS [DNL201912, DNL201915]
- Joint Fund of the Yulin University
- Dalian National Laboratory for Clean Energy [2021002, 2021009]
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The study proposes an electrostatic self-assembly strategy for the synthesis of lithium storage material rGO/MnO, demonstrating its superior electrochemical performance. The as-synthesized rGO/MnO shows high capacity, excellent rate capability, and cycle stability, with the flexible solid-state cell achieving exceptional energy and power density. The results also reveal high safety and long lifespan of the material.
The delicate structural engineering is widely acknowledged as a powerful tool for boosting the electrochemical performance of conversion-type anode materials for lithium storage. Here, a general electrostatic self-assembly strategy is proposed for the in situ synthesis of MnO nano-cabbages on negatively charged reduced graphene oxide (rGO/MnO). The strong interfacial heterostructure and robust lithium storage mechanism related to fast Li+ diffusion kinetics and high Li-adsorption ability of rGO/MnO heterostructure are confirmed through operando experimental characterizations and theoretical calculation. Owing to the rapid charge transfer, enriched reaction sites, and stable heterostructure, the as-synthesized rGO/MnO anode delivers a high capacity (860 mAh g(-1) at 0.1 A g(-1)), superior rate capability (211 mAh g(-1) at 10 A g(-1)), and cycle stability. Notably, the as-assembled flexible pouch cell of activated carbon//rGO/MnO solid-state lithium-ion capacitors (LICs) possesses an exceptional energy density of 194 Wh kg(-1) and power density of 40.7 kW kg(-1), both of which are among the highest flexible solid-state LICs reported so far. Further, the LICs possess an ultralong life span with approximate to 77.8% retention after 10 000 cycles and extraordinary safety, demonstrative of great potential for practical applications.
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