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Updated: Jul 5, 2025
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Published on: November 11, 2013
Enhancing the Stability of 4.6 V LiCoO2 Cathode Material via Gradient Doping
Errui Wang1,2, Xiangju Ye1, Bentian Zhang1,2
1College of Chemistry and Material Engineering, Anhui Science and Technology University, Bengbu 233030, China.
Abstract:
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.
