Vanadium(III) Acetylacetonate as an Efficient Soluble Catalyst for Lithium-Oxygen Batteries.,Angewandte Chemie International Edition

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Vanadium(III) Acetylacetonate as an Efficient Soluble Catalyst for Lithium-Oxygen Batteries.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2019-08-01 , DOI: 10.1002/anie.201907477
Qin Zhao _{1,

2} , Naman Katyal ₃ , Ieuan D Seymour ₃ , Graeme Henkelman ₃ , Tianyi Ma ₂

Affiliation

High donor number (DN) solvents in Li-O2 batteries that dissolve superoxide intermediates in lithium peroxide (Li2 O2 ) formation facilitate high capacities at high rates and avoid early cell death. However, their beneficial characteristics also result in an instability towards highly reactive superoxide intermediates. Furthermore, Li-O2 batteries would deliver a superior energy density, but the multiphase electrochemical reactions are difficult to achieve when operating with only solid catalysts. Herein we demonstrate that vanadium(III) acetylacetonate (V(acac)3 ) is an efficient soluble catalyst that can address these problems. During discharge, V(acac)3 integrates with the superoxide intermediate, accelerating O2 reduction kinetics and reducing side reactions. During charge, V(acac)3 acts as a redox mediator that permits efficient oxidation of Li2 O2 . The cells with V(acac)3 exhibit low overpotential, high rate performance, and considerable cycle stability.

中文翻译：

乙酰丙酮钒（III）作为锂氧电池的高效可溶性催化剂。

Li-O2电池中的高施主数（DN）溶剂可溶解过氧化锂（Li2 O2）形成中的超氧化物中间体，从而有助于高容量高容量并避免早期电池死亡。然而，它们的有益特性也导致对高反应性超氧化物中间体的不稳定性。此外，Li-O2电池将提供卓越的能量密度，但仅使用固体催化剂运行时，很难实现多相电化学反应。本文中，我们证明乙酰丙酮钒（III）（V（acac）3）是一种有效的可溶性催化剂，可以解决这些问题。在放电过程中，V（acac）3与超氧化物中间体结合在一起，从而加速了O2的还原动力学并减少了副反应。在充电过程中，V（acac）3用作氧化还原介体，可实现Li2 O2的有效氧化。具有V（acac）3的电池表现出低的超电势，高倍率性能和相当大的循环稳定性。

更新日期：2019-08-01

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