High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium Storage
Manganese dioxide (MnO<sub>2</sub>) exists in a variety of polymorphs and crystallographic structures. The electrochemical performance of Li storage can vary depending on the polymorph and the morphology. In this study, we present a new approach to fabricate polymorph- and aspect-ratio-c...
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MDPI AG
2023-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/13/20/2808 |
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| author | Hye-min Kim Byung-chul Cha Dae-wook Kim |
| author_facet | Hye-min Kim Byung-chul Cha Dae-wook Kim |
| author_sort | Hye-min Kim |
| collection | DOAJ |
| description | Manganese dioxide (MnO<sub>2</sub>) exists in a variety of polymorphs and crystallographic structures. The electrochemical performance of Li storage can vary depending on the polymorph and the morphology. In this study, we present a new approach to fabricate polymorph- and aspect-ratio-controlled α-MnO<sub>2</sub> nanorods. First, δ-MnO<sub>2</sub> nanoparticles were synthesized using a solution plasma process assisted by three types of sugars (sucrose, glucose, and fructose) as reducing promoters; this revealed different morphologies depending on the nucleation rate and reaction time from the molecular structure of the sugars. Based on the morphology of δ-MnO<sub>2</sub>, the polymorphic-transformed three types of α-MnO<sub>2</sub> nanorods showed different aspect ratios (<i>c/a</i>), which highly affected the transport of Li ions. Among them, a relatively small aspect ratio (<i>c/a</i> = 5.1) and wide width of α-MnO<sub>2</sub>-S nanorods (sucrose-assisted) induced facile Li-ion transport in the interior of the particles through an increased Li-ion pathway. Consequently, α-MnO<sub>2</sub>-S exhibited superior battery performance with a high-rate capability of 673 mAh g<sup>−1</sup> at 2 A g<sup>−1</sup>, and it delivered a high reversible capacity of 1169 mAh g<sup>−1</sup> at 0.5 A g<sup>−1</sup> after 200 cycles. Our findings demonstrated that polymorphs and crystallographic properties are crucial factors in the electrode design of high-performance Li-ion batteries. |
| first_indexed | 2024-03-10T20:59:28Z |
| format | Article |
| id | doaj.art-42a3d088b93e468e941b198e2a448bcc |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T20:59:28Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-42a3d088b93e468e941b198e2a448bcc2023-11-19T17:36:28ZengMDPI AGNanomaterials2079-49912023-10-011320280810.3390/nano13202808High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium StorageHye-min Kim0Byung-chul Cha1Dae-wook Kim2Department of Materials Chemistry, Shinshu University, 4-17-1, Wakasato, Nagano 3808553, JapanAdvanced Manufacturing Process R&D Group, Ulsan Division, Korea Institute of Industrial Technology (KITECH), 55, Jongga-ro, Jung-gu, Ulsan 44313, Republic of KoreaAdvanced Manufacturing Process R&D Group, Ulsan Division, Korea Institute of Industrial Technology (KITECH), 55, Jongga-ro, Jung-gu, Ulsan 44313, Republic of KoreaManganese dioxide (MnO<sub>2</sub>) exists in a variety of polymorphs and crystallographic structures. The electrochemical performance of Li storage can vary depending on the polymorph and the morphology. In this study, we present a new approach to fabricate polymorph- and aspect-ratio-controlled α-MnO<sub>2</sub> nanorods. First, δ-MnO<sub>2</sub> nanoparticles were synthesized using a solution plasma process assisted by three types of sugars (sucrose, glucose, and fructose) as reducing promoters; this revealed different morphologies depending on the nucleation rate and reaction time from the molecular structure of the sugars. Based on the morphology of δ-MnO<sub>2</sub>, the polymorphic-transformed three types of α-MnO<sub>2</sub> nanorods showed different aspect ratios (<i>c/a</i>), which highly affected the transport of Li ions. Among them, a relatively small aspect ratio (<i>c/a</i> = 5.1) and wide width of α-MnO<sub>2</sub>-S nanorods (sucrose-assisted) induced facile Li-ion transport in the interior of the particles through an increased Li-ion pathway. Consequently, α-MnO<sub>2</sub>-S exhibited superior battery performance with a high-rate capability of 673 mAh g<sup>−1</sup> at 2 A g<sup>−1</sup>, and it delivered a high reversible capacity of 1169 mAh g<sup>−1</sup> at 0.5 A g<sup>−1</sup> after 200 cycles. Our findings demonstrated that polymorphs and crystallographic properties are crucial factors in the electrode design of high-performance Li-ion batteries.https://www.mdpi.com/2079-4991/13/20/2808Li-ion batteriesα-MnO<sub>2</sub>anodeLi-ion transportaspect ratio |
| spellingShingle | Hye-min Kim Byung-chul Cha Dae-wook Kim High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium Storage Nanomaterials Li-ion batteries α-MnO<sub>2</sub> anode Li-ion transport aspect ratio |
| title | High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium Storage |
| title_full | High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium Storage |
| title_fullStr | High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium Storage |
| title_full_unstemmed | High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium Storage |
| title_short | High-Rate One-Dimensional α-MnO<sub>2</sub> Anode for Lithium-Ion Batteries: Impact of Polymorphic and Crystallographic Features on Lithium Storage |
| title_sort | high rate one dimensional α mno sub 2 sub anode for lithium ion batteries impact of polymorphic and crystallographic features on lithium storage |
| topic | Li-ion batteries α-MnO<sub>2</sub> anode Li-ion transport aspect ratio |
| url | https://www.mdpi.com/2079-4991/13/20/2808 |
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