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Energy Materials and Devices 2023, 1(1): 9370001 https://doi.org/10.26599/EMD.2023.9370001
Research Article | Open Access | Issue | Published: 14 September 2023

Conversion mechanism of NiCo2Se4 nanotube sphere anodes for potassium-ion batteries

Show Author's Information Mingyue Wang1,2,†,  Yang Li2,†,  Shanshan Yao2,  Jiang Cui2,  Lianbo Ma2,  Nauman Mubarak2,  Hongming Zhang2,  Shujiang Ding1( ),  Jang-Kyo Kim2,3,4( )
School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, “Four Joint Subjects One Union” School-Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology, Xi’an Jiaotong University, Xi’an710049, China
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney NSW 2052, Australia
Department of Mechanical Engineering, Khalifa University, P. O. Box 127788, Abu Dhabi, United Arab Emirates

† Mingyue Wang and Yang Li contributed equally to this work.

Keywords:
density functional theory (DFT) calculations, conversion reaction mechanism, bimetallic selenide nanotubes, potassium-ion storage
Cite this article:
Wang M, Li Y, Yao S, et al. Conversion mechanism of NiCo2Se4 nanotube sphere anodes for potassium-ion batteries. Energy Materials and Devices, 2023, 1(1): 9370001. https://doi.org/10.26599/EMD.2023.9370001
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Abstract Full text Electronic supplementary material About this article

Given the abundance of potassium resources, potassium-ion batteries are considered a low-cost alternative to lithium-ion types. However, their electrochemical performance remains rather unsatisfactory because potassium ions have sluggish kinetics and large ionic radius. In this study, NiCo2Se4 nanotube spheres are synthesized as efficient potassium storage hosts via a facile two-step hydrothermal process. The rationally designed electrode has various ameliorating morphological and functional features, including the following: (i) A hollow structure allows for relief of the volume expansion while offering an excellent electrochemical reactivity to accelerate the conversion kinetics; (ii) a high electrical conductivity for enhanced electron transfer; and (iii) myriad vacancies to supply active sites for electrochemical reactions. As such, the electrode delivers an initial reversible capacity of 458.1 mAh g−1 and retains 346.6 mAh g−1 after 300 cycles at 0.03 A g−1. The electrode sustains a high capacity of 101.4 mAh g−1 even at a high current density of 5 A g−1 and outperforms the majority of state-of-the-art anodes in terms of both cyclic capacity and rate capability, especially at above 1.0 A g−1. This study not only proves bimetallic selenides are promising candidates for potassium storage devices but also offers new insight into the rational design of electrode materials for high-rate potassium-ion batteries.


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Electronic supplementary material
About this article

Conversion mechanism of NiCo2Se4 nanotube sphere anodes for potassium-ion batteries

Show Author's information Mingyue Wang1,2,†, Yang Li2,†, Shanshan Yao2, Jiang Cui2, Lianbo Ma2, Nauman Mubarak2, Hongming Zhang2, Shujiang Ding1( ), Jang-Kyo Kim2,3,4( )
School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, “Four Joint Subjects One Union” School-Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology, Xi’an Jiaotong University, Xi’an710049, China
Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney NSW 2052, Australia
Department of Mechanical Engineering, Khalifa University, P. O. Box 127788, Abu Dhabi, United Arab Emirates

† Mingyue Wang and Yang Li contributed equally to this work.

Abstract

Given the abundance of potassium resources, potassium-ion batteries are considered a low-cost alternative to lithium-ion types. However, their electrochemical performance remains rather unsatisfactory because potassium ions have sluggish kinetics and large ionic radius. In this study, NiCo2Se4 nanotube spheres are synthesized as efficient potassium storage hosts via a facile two-step hydrothermal process. The rationally designed electrode has various ameliorating morphological and functional features, including the following: (i) A hollow structure allows for relief of the volume expansion while offering an excellent electrochemical reactivity to accelerate the conversion kinetics; (ii) a high electrical conductivity for enhanced electron transfer; and (iii) myriad vacancies to supply active sites for electrochemical reactions. As such, the electrode delivers an initial reversible capacity of 458.1 mAh g−1 and retains 346.6 mAh g−1 after 300 cycles at 0.03 A g−1. The electrode sustains a high capacity of 101.4 mAh g−1 even at a high current density of 5 A g−1 and outperforms the majority of state-of-the-art anodes in terms of both cyclic capacity and rate capability, especially at above 1.0 A g−1. This study not only proves bimetallic selenides are promising candidates for potassium storage devices but also offers new insight into the rational design of electrode materials for high-rate potassium-ion batteries.

Keywords: density functional theory (DFT) calculations, conversion reaction mechanism, bimetallic selenide nanotubes, potassium-ion storage

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Publication history

Received: 18 July 2023
Revised: 18 August 2023
Accepted: 23 August 2023
Published: 14 September 2023
Issue date: September 2023

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© The Author(s) 2023. Published by Tsinghua University Press.

Acknowledgements

The research project was financially supported by the Research Grants Council (GRF project 16208718), the Innovation and Technology Commission (ITF project ITS/001/17) of Hong Kong SAR, and the National Natural Science Foundation of China (No. 52202297). Part of the work was carried out when Mingyue Wang was a visiting PhD student at the Hong Kong University of Science and Technology (HKUST). The authors appreciate the technical assistance from the Advanced Engineering Materials Facilities and the Materials Characterization and Preparation Facilities at HKUST. We acknowledge Chang Huang at the Instrument Analysis Center of Xi’an Jiaotong University for the assistance with XRD analysis.

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