阴极
材料科学
兴奋剂
电导率
电池(电)
价(化学)
离子
电压
化学物理
降级(电信)
化学工程
光电子学
电气工程
热力学
化学
物理化学
功率(物理)
物理
有机化学
工程类
作者
Errui Wang,Xiangju Ye,Bentian Zhang,Bo Qü,Jiahao Guo,Shourong Zheng
摘要
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.
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