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| Effects of Nb Doping on Performance of Li1.16Mn0.56Ni0.28O2 |
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Received:May 12, 2022
Revised:May 18, 2022
Accepted:May 21, 2022
Published Online:September 16, 2022
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| DOI：doi：10.3969/j.issn.1007-7545.2022.10.013 |
| KeyWord:lithium-ion battery; cathode; Co-free lithium rich manganese layered oxide; Nb doping |
| Author | Institution |
| CUI Zheng-yuan |
北京矿冶研究总院 |
| WANG Jun |
北京当升材料科技股份有限公司 |
| LIU Ya-fei |
北京当升材料科技股份有限公司 |
| CHEN Yan-bin |
北京当升材料科技股份有限公司 |
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| Abstract: |
| Nb doped Li1.16Mn0.56Ni0.28O2 samples were prepared by high-temperature solid-state method. It is found that Nb doping can increase primary particles size and reduce specific surface area. The linear change of a and c values follows Vegard''s law when the doping amounts is less than 0.1%(mass fraction), indicating that Nb enters into the transition metal site; while Nb partly exists on grain boundary or surface in the form of Nb compound, when Nb-doping amount is more than 0.1%. The sample with 0.1% Nb doping shows the best electrochemical performance with specific discharge capacity of 256.9 mAh/g (0.1 C discharge capacity) and coulombic efficiency of 87.8%, it’s capacity retention is 85.4% after 80 cycles at 0.5 C. Nb doping expands the Li slab, which is helpful to the Li+ de-intercalation. Meanwhile the strong Nb—O bond alleviates the loss of lattice oxygen and stabilizes the structure of Co-free lithium rich manganese layered oxide.256.9 mAh/g (0.1 C discharge capacity) and 87.8 % (coulombic efficiency), it’s capacity retention is 85.4 % after 80 cycles at 0.5 C. Nb doping expands the Li slab, which is helpful to the Li+ de-intercalation. Meanwhile the strong Nb-O bond alleviates the loss of lattice oxygen and stabilizes the structure of Co-free lithium rich manganese layered oxide. |
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