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Li, Junfeng, Zheng, Yunshan, Hui, Kwan San 
ORCID: https://orcid.org/0000-0001-7089-7587, Wang, Kaixi, Zha, Chenyang, Dinh, Duc Anh, Tu, Jiguo, Shao, Zongping and Hui, Kwun Nam
(2023)
Enhanced K-storage performance in ultralong cycle-life potassium-ion batteries achieved via carbothermal-reduction-synthesized KVOPO4 cathode.
Energy Storage Materials, 61.
ISSN 2405-8297
Abstract
Polyanion-type cathode materials have the potential to provide high energy density and long cycling for next-generation potassium ion batteries (PIBs) due to their polyanionic inductive effect and structural stability. However, uncontrolled solid-state synthesis of these materials can lead to native impurity defects, resulting in degradation in the high-voltage operation and capacity drop upon cycling. Here, a carbothermal reduction approach and a stable electrode/electrolyte interface construction regulated by voltage are combined to ensure ultra-long cycling PIBs with the prepared pure-phase KVOPO4 materials. Such a desirable material features a stable 3D crystal framework and numerous K sites, facilitating efficient and sustained K+ diffusion during cycling. Therefore, the high reversibility of K ions storage enables a decent discharge capacity of ∼63 mAhg−1 after 1000 cycles at C/2 and a low-capacity decay of about 0.013% per cycle. Structural characterization and theory calculation demonstrate the exceptional structure and robust electrode/electrolyte interface of KVOPO4, which successfully explains its cycling stability. Furthermore, the full cell using the commercial hard carbon delivers a specific capacity of 60 mAhg−1 at C/2 (based on the active mass of the cathode) after 700 cycles, thus accelerating the practical applications of KVOPO4 materials.
| Item Type: | Article |
|---|---|
| Additional Information: | Funding Information: This work was funded by the Science and Technology Development Fund , Macau SAR (File no. 0046/2019/AFJ and 0007/2021/AGJ), University of Macau (File no., MYRG2020–00187-IAPME and MYRG2022–00223-IAPME), and the UEA funding. The DFT calculations are performed at High Performance Computing Cluster (HPCC) of Information and Communication Technology Office (ICTO) at University of Macau. |
| Uncontrolled Keywords: | carbothermal reduction approach,interface characterization,k storage mechanism,kvopo cathode,renewable energy, sustainability and the environment,materials science(all),energy engineering and power technology,sdg 7 - affordable and clean energy ,/dk/atira/pure/subjectarea/asjc/2100/2105 |
| Faculty \ School: | Faculty of Science > School of Engineering |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 12 Jul 2024 14:31 |
| Last Modified: | 14 Jul 2024 06:34 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/95904 |
| DOI: | 10.1016/j.ensm.2023.102852 |
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