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Probing the Self‐Boosting Catalysis of LiCoO2 in Li–O2 Battery with Multiple In Situ/Operando Techniques
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/adfm.202002223 Rui Gao 1 , Dong Zhou 2 , De Ning 2 , Wenjing Zhang 1 , Li Huang 1 , Fu Sun 2 , Götz Schuck 2 , Gerhard Schumacher 2 , Zhongbo Hu 1 , Xiangfeng Liu 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-05-25 , DOI: 10.1002/adfm.202002223 Rui Gao 1 , Dong Zhou 2 , De Ning 2 , Wenjing Zhang 1 , Li Huang 1 , Fu Sun 2 , Götz Schuck 2 , Gerhard Schumacher 2 , Zhongbo Hu 1 , Xiangfeng Liu 1
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Designing high‐activity catalysts and revealing the in‐depth structure–property relationship is particularly important for Li–O2 batteries. Herein, the self‐boosting catalysis of LiCoO2 as an electrocatalyst for Li–O2 batteries and the investigation of its self‐adjustment mechanism using in situ X‐ray absorption spectroscopy and other operando characterization techniques is reported. The intercalation/extraction of Li+ in LiCoO2 not only induces the change in Co valence and modulates the electronic/crystal structure but also tunes the surface disorder degree, lattice strain, and local symmetry, which all affect the catalysis activity. In a discharge, highly ordered LiCoO2 acts as a catalyst to boost oxygen reduction reaction. During charging, the initial extraction of Li+ from LiCoO2 induces Li/oxygen vacancy and Co4+, which deforms CoO6 octahedron as well as lowers the symmetry, and accordingly promotes oxygen evolution reaction. This article offers insights into tuning the activity of catalysts for Li–O2 batteries with the intercalation/extraction of alkali metal ions in traditional cathodes.
中文翻译：
利用多种原位/操作技术探索Li–O2电池中LiCoO2的自加速催化
设计高活性催化剂并揭示深层结构与性质的关系对于Li-O 2电池尤为重要。本文报道了LiCoO 2作为Li-O 2电池电催化剂的自增强催化作用，并利用原位X射线吸收光谱法和其他操作表征技术研究了其自我调节机制。Li +在LiCoO 2中的嵌入/萃取不仅引起Co价的变化并调节电子/晶体结构，而且调节表面无序度，晶格应变和局部对称性，这些都影响催化活性。在放电中，高度有序的LiCoO 2用作促进氧还原反应的催化剂。在充电过程中，从LiCoO 2初始提取Li +会诱导Li /氧空位和Co 4+，从而使CoO 6八面体变形并降低对称性，从而促进氧释放反应。本文提供了在传统阴极中嵌入/萃取碱金属离子来调节Li–O 2电池催化剂活性的见解。
更新日期：2020-07-09
中文翻译：
利用多种原位/操作技术探索Li–O2电池中LiCoO2的自加速催化
设计高活性催化剂并揭示深层结构与性质的关系对于Li-O 2电池尤为重要。本文报道了LiCoO 2作为Li-O 2电池电催化剂的自增强催化作用，并利用原位X射线吸收光谱法和其他操作表征技术研究了其自我调节机制。Li +在LiCoO 2中的嵌入/萃取不仅引起Co价的变化并调节电子/晶体结构，而且调节表面无序度，晶格应变和局部对称性，这些都影响催化活性。在放电中，高度有序的LiCoO 2用作促进氧还原反应的催化剂。在充电过程中，从LiCoO 2初始提取Li +会诱导Li /氧空位和Co 4+，从而使CoO 6八面体变形并降低对称性，从而促进氧释放反应。本文提供了在传统阴极中嵌入/萃取碱金属离子来调节Li–O 2电池催化剂活性的见解。
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