Comprehensive study of Ti and Ta co-doping in Ni-rich cathode material LiNi0.8Mn0.1Co0.1O2 towards improving the electrochemical performance
© 2024 Wiley‐VCH GmbH..
Layered Ni-rich oxides (LiNi1-x-yCoxMnyO2) cathode materials are of current interest in high-energy-demanding applications, such as electric vehicles because of high discharge capacity and high intercalation potential. Here, the effect of co-doping a small amount of Ti and Ta on the crystal structure, morphology, and electrochemical properties of high Ni-rich cathode material LiNi0.8Mn0.1Co0.1-x-yTixTayO2 (0.0 ≤ x+y ≤ 0.2) was systematically investigated. This work demonstrates that an optimum level of Ti and Ta doping is beneficial towards enhancing electrochemical performance. The optimal Ti4+ and Ta5+ co-doped cathode LiNi0.8Mn0.1Co0.09Ti0.005Ta0.005O2 exhibits a superior initial discharge capacity of 161.1 mAh g-1 at 1C, and excellent capacity retention of 87.1% after 250 cycles, compared to the pristine sample that exhibits only 59.8% capacity retention. Moreover, the lithium-ion diffusion coefficients for the co-doped cathode after the 3rd and 50th cycles are 9.9×10-10 cm2 s-1 and 9.3×10-10 cm2 s-1 respectively, which is higher than that of the pristine cathode (3.3×10-10 cm2 s-1 and 2.5×10-10 cm2 s-1 respectively). Based on these studies, we conclude that Ti and Ta co-doping enhances structural stability by mitigating irreversible phase transformation, improving Li-ion kinetics by expanding interlayer spacing, and nanosizing primary particles, thereby stabilizing high-nickel cathode materials and significantly enhancing cyclability.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - year:2024 |
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| Enthalten in: |
Chemphyschem : a European journal of chemical physics and physical chemistry - (2024) vom: 04. Apr., Seite e202400064 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Kumar, Deepak [VerfasserIn] |
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| Links: |
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| Themen: |
Co-precipitation |
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| Anmerkungen: |
Date Revised 04.04.2024 published: Print-Electronic Citation Status Publisher |
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| doi: |
10.1002/cphc.202400064 |
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| PPN (Katalog-ID): |
NLM370648056 |
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| 245 | 1 | 0 | |a Comprehensive study of Ti and Ta co-doping in Ni-rich cathode material LiNi0.8Mn0.1Co0.1O2 towards improving the electrochemical performance |
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| 520 | |a Layered Ni-rich oxides (LiNi1-x-yCoxMnyO2) cathode materials are of current interest in high-energy-demanding applications, such as electric vehicles because of high discharge capacity and high intercalation potential. Here, the effect of co-doping a small amount of Ti and Ta on the crystal structure, morphology, and electrochemical properties of high Ni-rich cathode material LiNi0.8Mn0.1Co0.1-x-yTixTayO2 (0.0 ≤ x+y ≤ 0.2) was systematically investigated. This work demonstrates that an optimum level of Ti and Ta doping is beneficial towards enhancing electrochemical performance. The optimal Ti4+ and Ta5+ co-doped cathode LiNi0.8Mn0.1Co0.09Ti0.005Ta0.005O2 exhibits a superior initial discharge capacity of 161.1 mAh g-1 at 1C, and excellent capacity retention of 87.1% after 250 cycles, compared to the pristine sample that exhibits only 59.8% capacity retention. Moreover, the lithium-ion diffusion coefficients for the co-doped cathode after the 3rd and 50th cycles are 9.9×10-10 cm2 s-1 and 9.3×10-10 cm2 s-1 respectively, which is higher than that of the pristine cathode (3.3×10-10 cm2 s-1 and 2.5×10-10 cm2 s-1 respectively). Based on these studies, we conclude that Ti and Ta co-doping enhances structural stability by mitigating irreversible phase transformation, improving Li-ion kinetics by expanding interlayer spacing, and nanosizing primary particles, thereby stabilizing high-nickel cathode materials and significantly enhancing cyclability | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Co-precipitation | |
| 650 | 4 | |a Ni-rich cathode | |
| 650 | 4 | |a Ta-doping | |
| 650 | 4 | |a Ti-Ta co-doping | |
| 650 | 4 | |a Ti-doping | |
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