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Realizing the Embedded Growth of Large Li2O2 Aggregations by Matching Different Metal Oxides for High‐Capacity and High‐Rate Lithium Oxygen Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2017-07-20 , DOI: 10.1002/advs.201700172 Peng Zhang 1, 2 , Shoufeng Zhang 3 , Mu He 2, 4 , Junwei Lang 1 , Aimin Ren 3 , Shan Xu 4 , Xingbin Yan 1
Advanced Science ( IF 14.3 ) Pub Date : 2017-07-20 , DOI: 10.1002/advs.201700172 Peng Zhang 1, 2 , Shoufeng Zhang 3 , Mu He 2, 4 , Junwei Lang 1 , Aimin Ren 3 , Shan Xu 4 , Xingbin Yan 1
Affiliation
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Large Li2O2 aggregations can produce high‐capacity of lithium oxygen (Li‐O2) batteries, but the larger ones usually lead to less‐efficient contact between Li2O2 and electrode materials. Herein, a hierarchical cathode architecture based on different discharge characteristics of α‐MnO2 and Co3O4 is constructed, which can enable the embedded growth of large Li2O2 aggregations to solve this problem. Through experimental observations and first‐principle calculations, it is found that α‐MnO2 nanorod tends to form uniform Li2O2 particles due to its preferential Li+ adsorption and similar LiO2 adsorption energies of different crystal faces, whereas Co3O4 nanosheet tends to simultaneously generate Li2O2 film and Li2O2 nanosheets due to its preferential O2 adsorption and different LiO2 adsorption energies of varied crystal faces. Thus, the composite cathode architecture in which Co3O4 nanosheets are grown on α‐MnO2 nanorods can exhibit extraordinary synergetic effects, i.e., α‐MnO2 nanorods provide the initial nucleation sites for Li2O2 deposition while Co3O4 nanosheets provide dissolved LiO2 to promote the subsequent growth of Li2O2. Consequently, the composite cathode achieves the embedded growth of large Li2O2 aggregations and thus exhibits significantly improved specific capacity, rate capability, and cyclic stability compared with the single metal oxide electrode.
中文翻译：
通过匹配不同金属氧化物实现大容量Li2O2聚集体嵌入生长高容量高倍率锂氧电池
较大的Li 2 O 2聚集体可以产生高容量的锂氧（Li-O 2 ）电池，但较大的Li 2 O 2 聚集体通常会导致Li 2 O 2与电极材料之间的接触效率较低。本文构建了基于α-MnO 2和Co 3 O 4不同放电特性的分级阴极结构，可以实现大Li 2 O 2聚集体的嵌入生长，从而解决了这一问题。通过实验观察和第一性原理计算发现，α-MnO 2纳米棒由于其优先吸附Li +且不同晶面的LiO 2吸附能相似，易于形成均匀的Li 2 O 2颗粒，而Co 3 O 4由于其优先吸附O 2以及不同晶面的不同LiO 2吸附能，纳米片倾向于同时生成Li 2 O 2薄膜和Li 2 O 2纳米片。因此，在α-MnO 2纳米棒上生长Co 3 O 4纳米片的复合阴极结构可以表现出非凡的协同效应，即α-MnO 2纳米棒为Li 2 O 2沉积提供初始成核位点，而Co 3 O 4纳米片提供溶解的LiO 2以促进Li 2 O 2的后续生长。因此，复合正极实现了大的Li 2 O 2聚集体的嵌入生长，从而与单一金属氧化物电极相比表现出显着改善的比容量、倍率性能和循环稳定性。
更新日期：2017-07-20
中文翻译：
通过匹配不同金属氧化物实现大容量Li2O2聚集体嵌入生长高容量高倍率锂氧电池
较大的Li 2 O 2聚集体可以产生高容量的锂氧（Li-O 2 ）电池，但较大的Li 2 O 2 聚集体通常会导致Li 2 O 2与电极材料之间的接触效率较低。本文构建了基于α-MnO 2和Co 3 O 4不同放电特性的分级阴极结构，可以实现大Li 2 O 2聚集体的嵌入生长，从而解决了这一问题。通过实验观察和第一性原理计算发现，α-MnO 2纳米棒由于其优先吸附Li +且不同晶面的LiO 2吸附能相似，易于形成均匀的Li 2 O 2颗粒，而Co 3 O 4由于其优先吸附O 2以及不同晶面的不同LiO 2吸附能，纳米片倾向于同时生成Li 2 O 2薄膜和Li 2 O 2纳米片。因此，在α-MnO 2纳米棒上生长Co 3 O 4纳米片的复合阴极结构可以表现出非凡的协同效应，即α-MnO 2纳米棒为Li 2 O 2沉积提供初始成核位点，而Co 3 O 4纳米片提供溶解的LiO 2以促进Li 2 O 2的后续生长。因此，复合正极实现了大的Li 2 O 2聚集体的嵌入生长，从而与单一金属氧化物电极相比表现出显着改善的比容量、倍率性能和循环稳定性。
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