Enhancing the Stability of 4.6 V LiCoO2 Cathode Material via Gradient Doping

LiCoO2 (LCO) can deliver ultrahigh discharge capacities as a cathode material for Li-ion batteries when the charging voltage reaches 4.6 V. However, establishing a stable LCO cathode at a high cut-off voltage is a challenge in terms of bulk and surface structural transformation. O2 release, irrevers...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2024-01, Vol.14 (2), p.147
Main Authors: Wang, Errui, Ye, Xiangju, Zhang, Bentian, Qu, Bo, Guo, Jiahao, Zheng, Shengbiao
Format: Article
Language:English
Subjects:
Bonding strength
Cathodes
Degradation
Doping
Electric potential
electrochemical
Electrode materials
Electrolytes
Electrons
gradient doping
Interlayers
Li-ion batteries
LiCoO2
Lithium
Lithium compounds
Lithium-ion batteries
Phase transitions
Rechargeable batteries
Side reactions
Stability
Voltage
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Summary:LiCoO2 (LCO) can deliver ultrahigh discharge capacities as a cathode material for Li-ion batteries when the charging voltage reaches 4.6 V. However, establishing a stable LCO cathode at a high cut-off voltage is a challenge in terms of bulk and surface structural transformation. O2 release, irreversible structural transformation, and interfacial side reactions cause LCO to experience severe capacity degradation and safety problems. To solve these issues, a strategy of gradient Ta doping is proposed to stabilize LCO against structural degradation. Additionally, Ta1-LCO that was tuned with 1.0 mol% Ta doping demonstrated outstanding cycling stability and rate performance. This effect was explained by the strong Ta-O bonds maintaining the lattice oxygen and the increased interlayer spacing enhancing Li+ conductivity. This work offers a practical method for high-energy Li-ion battery cathode material stabilization through the gradient doping of high-valence elements.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano14020147