Pre‐Lithiated Li2V6O13 Cathode Enables High‐Energy Aluminum‐Ion Battery
Pre‐Lithiated Li2V6O13 Cathode Enables High‐Energy Aluminum‐Ion Battery
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DOI：
10.1002/aenm.202201653
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发表时间：
2022-07
影响因子：
27.8
通讯作者：
Shunlong Ju;Jikai Ye;Yang Meng;Guanglin Xia;Xuebin Yu
中科院分区：
文献类型：
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作者：
Shunlong Ju;Jikai Ye;Yang Meng;Guanglin Xia;Xuebin Yu
由于铝的低成本、安全性和三电子氧化还原特性，可充电铝离子电池（AIB）正在成为一种有前途的储能技术。然而，探索具有提高的工作电压和高可逆容量的合适的阴极材料仍然是一个艰巨的挑战。在密度泛函理论计算的指导下，首次提出V_6O_1_3作为AIB阴极的候选材料。证明了铝离子通过插层反应可逆地存储在V6 O 13中，具有1.1V的高放电电压平台。特别注意的是，采用预锂化策略以进一步促进氧化还原动力学，这使得预锂化的V6 O 13纳米带（Li-VONB）在300次循环后，其容量提高到161.6 mAh g−1，能量密度达到177.7 Wh kg−1，远远高于AIB中其他已报道的氧化物阴极。此外，在原子尺度上揭示了预插入Li的屏蔽效应和加速扩散速率。这项工作开发了一种用于高能AIB的新型Li-VONB阴极，并显示了预插层策略在AIB应用中的巨大潜力。
Owing to the low‐cost, safety, and three‐electron redox properties of aluminum, rechargeable aluminum‐ion batteries (AIBs) are emerging as a promising energy storage technology. However, exploring suitable cathode material with both elevated working voltage and high reversible capacity remains a daunting challenge. Herein, under the guidance of density functional theory calculations, V6O13 is proposed as a promising cathode candidate in AIBs for the first time. It is demonstrated that aluminum ions are reversibly stored in V6O13 by intercalation reactions, with a high discharge voltage plateau of ≈1.1 V. Of particular note a pre‐lithiation strategy is employed to further promote the redox kinetics, which endows the pre‐lithiated V6O13 nanobelt (Li–VONB) with improved capacity of 161.6 mAh g−1 and impressive energy density of 177.7 Wh kg−1 after 300 cycles, far higher than other reported oxide cathodes in AIBs. Moreover, the shielding effect of pre‐inserted Li and accelerated diffusion rate are uncovered at the atomic scale. This work develops a novel Li–VONB cathode for high‐energy AIBs, and shows the great potential of pre‐intercalation strategies in the application of AIBs.