Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion Batteries
In this study, pure and Mg<sup>2+</sup>/Cr<sup>3+</sup> co-doped Ni/Mn bimetallic oxides were used as precursors to synthesize pristine and doped LNMO samples. The LNMO samples exhibited the same crystal structure as the precursors. XRD analysis confirmed the successful synth...
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2025-03-01
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| author | Dehua Ma Jiawei Wang Haifeng Wang Guibao Qian Xingjie Zhou Zhengqing Pei Kexin Zheng Qian Wang Ju Lu |
| author_facet | Dehua Ma Jiawei Wang Haifeng Wang Guibao Qian Xingjie Zhou Zhengqing Pei Kexin Zheng Qian Wang Ju Lu |
| author_sort | Dehua Ma |
| collection | DOAJ |
| description | In this study, pure and Mg<sup>2+</sup>/Cr<sup>3+</sup> co-doped Ni/Mn bimetallic oxides were used as precursors to synthesize pristine and doped LNMO samples. The LNMO samples exhibited the same crystal structure as the precursors. XRD analysis confirmed the successful synthesis of LNMO cathode materials using Ni/Mn bimetallic oxides as precursors. FTIR and Raman spectroscopy reveal that Mg<sup>2+</sup>/Cr<sup>3+</sup> co-doping promotes the formation of the Fd3m disordered phase, effectively reducing electrochemical polarization and charge transfer resistance. Furthermore, co-doping significantly lowers the Mn<sup>3+</sup> content on the LNMO surface, thereby mitigating Mn<sup>3+</sup> dissolution. Significantly, Mg<sup>2+</sup>/Cr<sup>3+</sup> co-doping induces the emergence of high-surface-energy {100} crystal facets in LNMO grains, which promote lithium-ion transport and, finally, enhance rate capability and cycling performance. Electrochemical analysis indicates that the initial discharge capacities of LNMO-0, LNMO-0.005, LNMO-0.010, and LNMO-0.015 were 126.4, 125.3, 145.3, and 138.2 mAh·g<sup>−1</sup>, respectively, with capacity retention rates of 82.45%, 82.93%, 83.32%, and 82.08% after 100 cycles. Furthermore, the impedance of LNMO-0.010 prior to cycling was 97.38 Ω, representing a 14.35% reduction compared to the pristine sample. After 100 cycles, its impedance was only 58.61% of that of the pristine sample, highlighting its superior rate capability and cycling stability. As far as we know, studies on the synthesis of LNMO cathode materials via the design of Ni/Mn bimetallic oxides remain limited. Accordingly, this work provides an innovative approach for the preparation and modification of LNMO cathode materials. The investigation of Ni/Mn bimetallic oxides as precursors, combined with co-doping by Mg<sup>2+</sup> and Cr<sup>3+</sup>, for the synthesis of high-performance LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> (LNMO) aims to provide insights into improving rate capability, cycling stability, reducing impedance, and enhancing capacity retention. |
| format | Article |
| id | doaj-art-b6cf54da514446aa82c38ae1ae47a887 |
| institution | Kabale University |
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| publishDate | 2025-03-01 |
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| spelling | doaj-art-b6cf54da514446aa82c38ae1ae47a8872025-08-20T03:43:31ZengMDPI AGNanomaterials2079-49912025-03-0115642910.3390/nano15060429Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion BatteriesDehua Ma0Jiawei Wang1Haifeng Wang2Guibao Qian3Xingjie Zhou4Zhengqing Pei5Kexin Zheng6Qian Wang7Ju Lu8College of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaCollege of Materials and Metallurgy, Guizhou University, Guiyang 550025, ChinaIn this study, pure and Mg<sup>2+</sup>/Cr<sup>3+</sup> co-doped Ni/Mn bimetallic oxides were used as precursors to synthesize pristine and doped LNMO samples. The LNMO samples exhibited the same crystal structure as the precursors. XRD analysis confirmed the successful synthesis of LNMO cathode materials using Ni/Mn bimetallic oxides as precursors. FTIR and Raman spectroscopy reveal that Mg<sup>2+</sup>/Cr<sup>3+</sup> co-doping promotes the formation of the Fd3m disordered phase, effectively reducing electrochemical polarization and charge transfer resistance. Furthermore, co-doping significantly lowers the Mn<sup>3+</sup> content on the LNMO surface, thereby mitigating Mn<sup>3+</sup> dissolution. Significantly, Mg<sup>2+</sup>/Cr<sup>3+</sup> co-doping induces the emergence of high-surface-energy {100} crystal facets in LNMO grains, which promote lithium-ion transport and, finally, enhance rate capability and cycling performance. Electrochemical analysis indicates that the initial discharge capacities of LNMO-0, LNMO-0.005, LNMO-0.010, and LNMO-0.015 were 126.4, 125.3, 145.3, and 138.2 mAh·g<sup>−1</sup>, respectively, with capacity retention rates of 82.45%, 82.93%, 83.32%, and 82.08% after 100 cycles. Furthermore, the impedance of LNMO-0.010 prior to cycling was 97.38 Ω, representing a 14.35% reduction compared to the pristine sample. After 100 cycles, its impedance was only 58.61% of that of the pristine sample, highlighting its superior rate capability and cycling stability. As far as we know, studies on the synthesis of LNMO cathode materials via the design of Ni/Mn bimetallic oxides remain limited. Accordingly, this work provides an innovative approach for the preparation and modification of LNMO cathode materials. The investigation of Ni/Mn bimetallic oxides as precursors, combined with co-doping by Mg<sup>2+</sup> and Cr<sup>3+</sup>, for the synthesis of high-performance LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> (LNMO) aims to provide insights into improving rate capability, cycling stability, reducing impedance, and enhancing capacity retention.https://www.mdpi.com/2079-4991/15/6/429cathode materialLiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub>Ni/Mn bimetal oxideco-doping |
| spellingShingle | Dehua Ma Jiawei Wang Haifeng Wang Guibao Qian Xingjie Zhou Zhengqing Pei Kexin Zheng Qian Wang Ju Lu Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion Batteries Nanomaterials cathode material LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Ni/Mn bimetal oxide co-doping |
| title | Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion Batteries |
| title_full | Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion Batteries |
| title_fullStr | Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion Batteries |
| title_full_unstemmed | Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion Batteries |
| title_short | Mg<sup>2+</sup> and Cr<sup>3+</sup> Co-Doped LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Derived from Ni/Mn Bimetal Oxide as High-Performance Cathode for Lithium-Ion Batteries |
| title_sort | mg sup 2 sup and cr sup 3 sup co doped lini sub 0 5 sub mn sub 1 5 sub o sub 4 sub derived from ni mn bimetal oxide as high performance cathode for lithium ion batteries |
| topic | cathode material LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> Ni/Mn bimetal oxide co-doping |
| url | https://www.mdpi.com/2079-4991/15/6/429 |
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