阳极
材料科学
锂(药物)
动力学
化学工程
纳米晶
碳纤维
离子
兴奋剂
密度泛函理论
氧气
纳米技术
电极
复合数
化学
物理化学
光电子学
计算化学
复合材料
有机化学
内分泌学
工程类
物理
量子力学
医学
作者
Ying Liu,Chen Hu,Ling Chen,Yanjie Hu,Hao Jiang,Chunzhong Li
标识
DOI:10.1016/j.jechem.2022.01.021
摘要
Oxygen vacancies (VO) engineering has been deemed to an effective tactic for enhancing Li-ion storage kinetics and reversibility of SnO2-based anode materials. Herein, we demonstrated the confinement of ultrahigh VO SnO2 nanocrystals into N-doped carbon frameworks to boost their high-rate and cycle life. Density functional theory (DFT) calculations reveal that abundant VO in SnO2 facilitates the adsorption to Li-ion with remarkably increased carrier concentration. The 6.0 nm-sized SnO2 particles and the embedded design effectively stabilize the structural integrity during de-/lithiation. Meantime, the as-formed large hetero-interface also expedites the electron transfer. These merits guarantee its high-rate performance and superior cycling stability. Consequently, this sample exhibits a high capacity of 1368.9 mAh g−1 at 0.1 A g−1, and can still maintain 488.5 mAh g−1 at 10 A g−1 and a long life over 400 cycles at 5 A g−1 with 96.6% capacity retention, which is among the best report for Sn-contained anode materials. This work sheds light on ultrahigh Vo and structural design in conversion-type oxides for high-performance lithium-ion batteries (LIBs).
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