Details

Autor(en) / Beteiligte

• Wang, Errui
• Ye, Xiangju
• Zhang, Bentian
• Qu, Bo
• Guo, Jiahao
• Zheng, Shengbiao

Titel

Enhancing the Stability of 4.6 V LiCoO[sub.2] Cathode Material via Gradient Doping

Ist Teil von

• Nanomaterials (Basel, Switzerland), 2024-01, Vol.14 (2)

Ort / Verlag

MDPI AG

Erscheinungsjahr

2024

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• LiCoO[sub.2] (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. O[sub.2] 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, Ta[sub.1] -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[sup.+] conductivity. This work offers a practical method for high-energy Li-ion battery cathode material stabilization through the gradient doping of high-valence elements.