University of Oulu

Y. Lin, H. Tian, J. Qian, M. Yu, T. Hu, U. Lassi, Z. Chen, Z. Wu, Biocarbon-directed vertical δ-MnO2 nanoflakes for boosting lithium-ion diffusion kinetics, Materials Today Chemistry, Volume 26, 2022, 101023, ISSN 2468-5194,

Biocarbon-directed vertical δ-MnO₂ nanoflakes for boosting lithium-ion diffusion kinetics

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Author: Lin, Y.1,2; Tian, H.1; Qian, J.1;
Organizations: 1Jiangsu Key Laboratory for Environment Functional Materials, School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
2Sustainable Chemistry, Faculty of Technology, University of Oulu, Oulu 90570, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2024-06-30


Manganese dioxide (MnO₂) with high theoretical capacity (1230 mAh/g) and low cost is considered as a promising anode material for next generation high energy density lithium-ion (Li⁺) batteries. However, the intrinsic low electric conductivity and volume change during cycling process limit its applications. In this work, a unique δ-MnO₂/C composite has been synthesized through the directed growth of 2D δ-MnO₂ nanosheets on the cabbage-leaf-derived biocarbon. The biocarbon acts as both structure buffer to accommodate the volume expansion and conductive agent to promote electron and ion transport. Moreover, oriented δ-MnO₂ nanosheets are beneficial for increasing contact area between electrode and electrolyte, thus providing more active sites and shortening the Li+ transmission routes. Electrochemical performances show that δ-MnO₂/C displays large reversible capacity (754 mAh/g after 250 cycles at current density of 0.1 A/g), excellent rate capability as well as low charge transfer resistance (17.3 Ω), and high Li⁺ diffusion rate (DLi⁺ = 2.91 × 10⁻¹⁴ cm²/s) during the cycles. Furthermore, the density functional theory calculations reveal the lower Li⁺ migration barrier energies and improved Li+ diffusion kinetics in δ-MnO₂/C hetero-layer. This study provides a novel strategy to design advanced nanocomposites, using natural plant-leaf derivatives as structure-directing agents, for the next generation energy storage and conversion systems.

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Series: Materials today chemistry
ISSN: 2468-5194
ISSN-E: 2468-5194
ISSN-L: 2468-5194
Volume: 26
Article number: 101023
DOI: 10.1016/j.mtchem.2022.101023
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: This work was supported by the Project of Jiangsu Collaborative Innovation Center of Technology and Material for Water Treatment (XTCXSZ2020-1), and PASS project (2430356512) funded by EU Regional Fund in Finland. Financial supports from Jiangsu Engineering Laboratory of Novel Functional Polymeric Materials (SDGC2151), and the Jiangsu Innovation Project for Graduate Education (KYCX21_3017) in China are also gratefully acknowledged.
Copyright information: © 2022. This manuscript version is made available under the CC-BY-NC-ND 4.0 license by