Tuning lithium-peroxide formation and decomposition routes with single-atom catalysts for lithium-oxygen batteries
Tuning lithium-peroxide formation and decomposition routes with single-atom catalysts for lithium-oxygen batteries
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使用锂氧电池的单原子催化剂调整过氧化锂的形成和分解路线
DOI：
10.1038/s41467-020-15712-z
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发表时间：
2020-05-04
影响因子：
16.6
通讯作者：
Xu, Ji-Jing
中科院分区：
文献类型：
--
作者：
Song, Li-Na;Zhang, Wei;Xu, Ji-Jing
作为未来的能量存储技术，具有高能量密度的锂氧电池受到了相当大的关注。有效的电催化剂和循环过程中相应的工作机制的发展是至关重要的锂氧电池。在这里，通过聚合物封装策略合成用于锂氧电池的单个钴原子电催化剂。单原子催化剂的孤立部分可以有效地调节活性中心的分布，形成微米级的花状过氧化锂，并通过单电子途径促进过氧化锂的分解。具有单个钴原子的电池可以以高往返效率（86.2%）和长期稳定性（218天）运行，优于商业5wt%铂/碳催化剂。我们发现，单个原子和载体之间的协同作用赋予催化剂具有优异的稳定性和耐久性。这些有希望的结果为锂氧电池高效催化剂的设计提供了见解，并大大扩展了未来的研究范围。Li-O-2电池代表了通向高能量密度电池系统的有希望的途径之一。在这里，作者合成单原子Co电催化剂，以调节主要放电产物Li2O2的形成和分解，在Li-O-2电池中实现高往返效率和稳定性。
Lithium-oxygen batteries with ultrahigh energy density have received considerable attention as of the future energy storage technologies. The development of effective electrocatalysts and a corresponding working mechanism during cycling are critically important for lithium-oxygen batteries. Here, a single cobalt atom electrocatalyst is synthesized for lithium-oxygen batteries by a polymer encapsulation strategy. The isolated moieties of single atom catalysts can effectively regulate the distribution of active sites to form micrometre-sized flower-like lithium peroxide and promote the decomposition of lithium peroxide by a one-electron pathway. The battery with single cobalt atoms can operate with high round-trip efficiency (86.2%) and long-term stability (218 days), which is superior to a commercial 5wt% platinum/carbon catalyst. We reveal that the synergy between a single atom and the support endows the catalyst with excellent stability and durability. The promising results provide insights into the design of highly efficient catalysts for lithium-oxygen batteries and greatly expand the scope of future investigation. Li-O-2 batteries represent one of the promising paths toward high energy density battery systems. Here the authors synthesize single atom Co electrocatalysts to regulate the formation and decomposition of the major discharge product Li2O2, realizing high round-trip efficiency and stability in a Li-O-2 cell.