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Efficient potential-tuning strategy through p-type doping for designing cathodes with ultrahigh energy density
National Science Review ( IF 20.6 ) Pub Date : 2020-07-27 , DOI: 10.1093/nsr/nwaa174
Zhiqiang Wang 1 , Da Wang 2 , Zheyi Zou 2 , Tao Song 2 , Dixing Ni 1 , Zhenzhu Li 3 , Xuecheng Shao 4 , Wanjian Yin 3 , Yanchao Wang 4 , Wenwei Luo 1 , Musheng Wu 1 , Maxim Avdeev 5 , Bo Xu 1 , Siqi Shi 2 , Chuying Ouyang 1 , Liquan Chen 6
Affiliation  

Abstract
Designing new cathodes with high capacity and moderate potential is the key to breaking the energy density ceiling imposed by current intercalation chemistry on rechargeable batteries. The carbonaceous materials provide high capacities but their low potentials limit their application to anodes. Here, we show that Fermi level tuning by p-type doping can be an effective way of dramatically raising electrode potential. We demonstrate that Li(Na)BCF2/Li(Na)B2C2F2 exhibit such change in Fermi level, enabling them to accommodate Li+(Na+) with capacities of 290–400 (250–320) mAh g−1 at potentials of 3.4–3.7 (2.7–2.9) V, delivering ultrahigh energy densities of 1000–1500 Wh kg−1. This work presents a new strategy in tuning electrode potential through electronic band structure engineering.


中文翻译:

通过 p 型掺杂设计具有超高能量密度的阴极的有效电位调节策略

摘要
设计具有高容量和中等潜力的新型阴极是打破当前插层化学对可充电电池施加的能量密度上限的关键。碳质材料提供高容量,但它们的低电位限制了它们在阳极上的应用。在这里,我们表明通过 p 型掺杂调节费米能级是一种显着提高电极电位的有效方法。我们证明 Li(Na)BCF 2 /Li(Na)B 2 C 2 F 2在费米能级上表现出这种变化,使它们能够容纳容量为 290–400 (250–320) mAh g 的Li + (Na + ) −1在 3.4–3.7 (2.7–2.9) V 的电位下,提供 1000–1500 Wh kg -1 的超高能量密度。这项工作提出了一种通过电子能带结构工程调节电极电位的新策略。
更新日期:2020-11-13
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