Affiliation:
1. College of Chemistry and Material Engineering, Anhui Science and Technology University, Bengbu 233030, China
2. Anhui Province Quartz Sand Purification and Photovoltaic Glass Engineering Research Center, 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.
Funder
Talent-Introduction Program of Anhui Science and Technology University
Key Scientific Research Foundation of the Education Department of Anhui Province
Natural Science Foundation of Anhui Province
Anhui Province Key Research and Development Program
Natural Science Foundation of Education Department of Anhui