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| Effect of surface Sn doping on the electrochemical performance of Li-rich Mn-based materials |
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Received:December 09, 2024
Revised:December 11, 2024
Accepted:December 11, 2024
Published Online:January 21, 2025
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| DOI： |
| KeyWord:lithium-ion batteries; Li-rich Mn-based cathode materials; surface Sn doping; capacity retention; voltage decay |
| Author | Institution |
| YANG Yali |
BGRIMM Technology Group Co Ltd |
| LIU Yafei |
BGRIMM Technology Group Co Ltd |
| WANG Jun |
BGRIMM Technology Group Co Ltd |
| ZHANG Xuequan |
BGRIMM Technology Group Co Ltd |
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| Abstract: |
| To meet the performance demands of lithium-ion batteries for long-distance electric vehicle travel, it is crucial to develop high-energy-density cathode materials. Li-rich Mn-based oxides (LRM) have garnered widespread attention as next-generation cathode materials for lithium-ion batteries due to their high reversible capacity of over 250 mAh.g-1. The high capacity of LRM arises from the collaborative charge compensation between oxygen anions and transition metal cations. However, oxygen release, transition metal ion migration, and surface reconstruction lead to structural degradation, severely affecting the material"s cycling stability, voltage decay, and rate performance, thus limiting its commercialization. Numerous studies have shown that the performance degradation of Li-rich Mn-based cathodes originates from the collapse of the surface structure. In this study, large-sized Sn ions were used to modify the surface of the material, exploring the impact of Sn doping on the material"s structure and electrochemical performance. Through a series of characterization techniques, it was found that Sn successfully incorporated into the surface lattice, effectively inhibiting the irreversible migration of transition metal ions during cycling. Additionally, Sn induced the formation of a stable spinel phase on the surface, significantly enhancing the stability of surface oxygen and the interface, thereby greatly improving the electrochemical performance of the material. When discharged at 0.1C, the specific capacity can reach 310 mAh.g-1; after 150 cycles at 1C, the capacity retention is 88%. This modification method provides an effective approach to improving the stability of lithium-rich manganese-based cathode materials. |
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