优选介孔均匀锂生长机制实现硬碳锂离子/金属杂化阳极

IF 14 1区 化学 Q1 CHEMISTRY, APPLIED
Fang Yan , Yan Liu , Yuan Li , Yan Wang , Zicen Deng , Meng Li , Zhenwei Zhu , Aohan Zhou , Ting Li , Jingyi Qiu , Gaoping Cao , Shaobo Huang , Biyan Wang , Hao Zhang
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引用次数: 0

摘要

为了在锂电池中实现高能量密度,构建锂离子/金属混合阳极是一种很有前途的策略。特别是由于石墨的各向异性,石墨/锂金属形成的杂化阳极输运动力学低,容易引起锂枝晶的生长和死锂的积累,严重影响电池的循环寿命,甚至引起安全问题。本文通过对比石墨和两种硬碳,发现由硬碳和金属锂形成的杂化阳极具有更多无序介孔结构和亲石基团,具有更好的性能。结果表明,介孔结构为死锂提供了丰富的活性位点和存储空间。在该结构与亲石官能团(-COOH)的协同作用下,保持了硬碳/锂金属杂化阳极的可逆性,促进了金属锂的均匀沉积,减轻了锂枝晶的形成。在500 mAh/g的比容量下,混合阳极在260次循环后保持99.5%的库仑效率(CE)。这项工作为碳基材料与锂金属形成的具有高比能和快速充电能力的混合阳极提供了新的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Hard-carbon hybrid Li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

Hard-carbon hybrid Li-ion/metal anode enabled by preferred mesoporous uniform lithium growth mechanism

To achieve high energy density in lithium batteries, the construction of lithium-ion/metal hybrid anodes is a promising strategy. In particular, because of the anisotropy of graphite, hybrid anode formed by graphite/Li metal has low transport kinetics and is easy to causes the growth of lithium dendrites and accumulation of dead Li, which seriously affects the cycle life of batteries and even causes safety problems. Here, by comparing graphite with two types of hard carbon, it was found that hybrid anode formed by hard carbon and lithium metal, possessing more disordered mesoporous structure and lithophilic groups, presents better performance. Results indicate that the mesoporous structure provides abundant active site and storage space for dead lithium. With the synergistic effect of this structure and lithophilic functional groups (–COOH), the reversibility of hard carbon/lithium metal hybrid anode is maintained, promoting uniform deposition of lithium metal and alleviating formation of lithium dendrites. The hybrid anode maintains a 99.5% Coulombic efficiency (CE) after 260 cycles at a specific capacity of 500 mAh/g. This work provides new insights into the hybrid anodes formed by carbon-based materials and lithium metal with high specific energy and fast charging ability.

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CiteScore
23.60
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