V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency
Li-rich Mn-based oxides (LRMOs) hold great promise as next-generation cathode materials for high-energy Li-ion batteries because of their low cost and high capacity. Nevertheless, the practical application of LRMOs is impeded by their low initial Coulombic efficiency and rapid voltage decay. Herein,...
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| Format: | Article |
| Language: | English |
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Tsinghua University Press
2024-09-01
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| Series: | Energy Materials and Devices |
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| Online Access: | https://www.sciopen.com/article/10.26599/EMD.2024.9370039 |
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| author | Liping Tan Wenzhao Huang Xiaoyan Xie Xiaola Li Ziyang Liang Zhan Lin Chenyu Liu Dong Luo |
| author_facet | Liping Tan Wenzhao Huang Xiaoyan Xie Xiaola Li Ziyang Liang Zhan Lin Chenyu Liu Dong Luo |
| author_sort | Liping Tan |
| collection | DOAJ |
| description | Li-rich Mn-based oxides (LRMOs) hold great promise as next-generation cathode materials for high-energy Li-ion batteries because of their low cost and high capacity. Nevertheless, the practical application of LRMOs is impeded by their low initial Coulombic efficiency and rapid voltage decay. Herein, a V-doped layered-spinel coherent layer is constructed on the surface of a Co-free LRMO through a simple treatment with NH4VO3. The layered-spinel coherent layer with 3D ion channels enhanced Li+ diffusion efficiency, mitigates surface–interface reactions and suppresses irreversible oxygen release. Notably, V-doping significantly reduces the Bader charge of oxygen atoms, thereby impeding excessive oxidation of oxygen ions and further enhancing the stability of O-redox. The modified LRMO exhibites a remarkable initial Coulombic efficiency of 91.6%, significantly surpassing that of the original LRMO (74.4%). Furthermore, the treated sample showes an impressive capacity retention rate of 91.9% after 200 cycles, accompanied by a voltage decay of merely 0.47 mV per cycle. The proposed treatment approach is straightforward and significantly improves the initial Coulombic efficiency, voltage stability, and capacity stability of LRMO cathode materials, thus holding considerable promise for the development of high-energy Li-ion batteries. |
| format | Article |
| id | doaj-art-fea912e7eac34a86a7a420aff4762101 |
| institution | OA Journals |
| issn | 3005-3315 3005-3064 |
| language | English |
| publishDate | 2024-09-01 |
| publisher | Tsinghua University Press |
| record_format | Article |
| series | Energy Materials and Devices |
| spelling | doaj-art-fea912e7eac34a86a7a420aff47621012025-08-20T01:54:11ZengTsinghua University PressEnergy Materials and Devices3005-33153005-30642024-09-0123937003910.26599/EMD.2024.9370039V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiencyLiping Tan0Wenzhao Huang1Xiaoyan Xie2Xiaola Li3Ziyang Liang4Zhan Lin5Chenyu Liu6Dong Luo7School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, ChinaLi-rich Mn-based oxides (LRMOs) hold great promise as next-generation cathode materials for high-energy Li-ion batteries because of their low cost and high capacity. Nevertheless, the practical application of LRMOs is impeded by their low initial Coulombic efficiency and rapid voltage decay. Herein, a V-doped layered-spinel coherent layer is constructed on the surface of a Co-free LRMO through a simple treatment with NH4VO3. The layered-spinel coherent layer with 3D ion channels enhanced Li+ diffusion efficiency, mitigates surface–interface reactions and suppresses irreversible oxygen release. Notably, V-doping significantly reduces the Bader charge of oxygen atoms, thereby impeding excessive oxidation of oxygen ions and further enhancing the stability of O-redox. The modified LRMO exhibites a remarkable initial Coulombic efficiency of 91.6%, significantly surpassing that of the original LRMO (74.4%). Furthermore, the treated sample showes an impressive capacity retention rate of 91.9% after 200 cycles, accompanied by a voltage decay of merely 0.47 mV per cycle. The proposed treatment approach is straightforward and significantly improves the initial Coulombic efficiency, voltage stability, and capacity stability of LRMO cathode materials, thus holding considerable promise for the development of high-energy Li-ion batteries.https://www.sciopen.com/article/10.26599/EMD.2024.9370039co-free li-rich layered oxidev-doped layered-spinel coherent layervoltage stabilityhigh initial coulombic efficiency |
| spellingShingle | Liping Tan Wenzhao Huang Xiaoyan Xie Xiaola Li Ziyang Liang Zhan Lin Chenyu Liu Dong Luo V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency Energy Materials and Devices co-free li-rich layered oxide v-doped layered-spinel coherent layer voltage stability high initial coulombic efficiency |
| title | V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency |
| title_full | V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency |
| title_fullStr | V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency |
| title_full_unstemmed | V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency |
| title_short | V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency |
| title_sort | v doped co free li rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial coulombic efficiency |
| topic | co-free li-rich layered oxide v-doped layered-spinel coherent layer voltage stability high initial coulombic efficiency |
| url | https://www.sciopen.com/article/10.26599/EMD.2024.9370039 |
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