Zeinab Mohamed, Quan Zhou, Kefu Zhu, Guoliang Zhang, Wenjie Xu, Peter Joseph Chimtali, Yuyang Cao, HanChen Xu, Ziwei Yan, Yixiu Wang, Hassan Akhtar, Aad Al-Mahgari, Xiaojun Wu, Changda Wang, Li Song
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引用次数: 0
Abstract
Aprotic lithium–oxygen batteries (LOBs) may deliver exceptionally high energy density but struggle to attain rapid reversibility and substantial capacity simultaneously, due to typical surface or solution-formed insulating solid Li2O2. Tuning the structure of Li2O2 to create a large-area amorphous layer on the cathode is predicted to overcome the multiperformance limitations. Here, an isolated nickel single atom to nitrogen-doped graphene as a cathode catalyst (Ni─NG SAC) for LOBs is presented via a green click-trapping strategy. Derived from the maximized exposure of atomic active sites of the cathode, the formation/decomposition mechanisms of Li2O2 are tailored, and a large area of thin Li2O2 amorphous film is achieved. The structure and functions of Ni─NG SAC are explored by theoretical computation and synchrotron radiational investigation. Consequently, the abundant Ni─N4 sites enhance redox kinetics and stand out to deliver an impressive specific discharge/charge capacity of 24 248/17 656 mAh g−1 at 200 mA g−1, together with a long cycle life of over 500 cycles. This study contributes helpful insights to achieve high-capacity LOBs with long lifespans, by constructing unique single-atom catalysts to optimize the formation of amorphous discharge Li2O2 products.
期刊介绍:
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