材料科学
催化作用
腐蚀
碳纤维
锂(药物)
电解质
吸附
动力学
无机化学
木屑
分解
化学工程
电极
化学
复合材料
有机化学
复合数
物理化学
医学
物理
量子力学
工程类
内分泌学
作者
Huancheng Huang,Chang-Jing Cheng,Guoliang Zhang,Liang Guo,Gaoyang Li,Min Pan,Feng Dang,Xianmin Mai
标识
DOI:10.1002/adfm.202111546
摘要
Abstract Strong oxidant intermediates and the formation of byproducts during the discharge/charge process are the main challenges in the degradation of lithium–oxygen batteries (LOBs). A facile approach to maintain the stability of the cathode catalyst and avoid the formation of byproducts is essential for the development of LOBs. Here, a sawdust‐derived carbon catalyst is fabricated and subjected to surface phosphatization to suppress corrosion between carbon and electrolyte/products. This prevents the formation of byproducts from parasitic reactions and boosts the reaction kinetics of the carbon catalyst in LOBs. The doped P atoms will prior to substitute an N atom in pyrrolic‐N sites to form graphitic PN sites, instead of the graphitic PC sites. Experimental and density functional theory calculations reveal that the graphitic PN sites can function as a reaction kinetics promoter for the formation/decomposition of discharge products. Moreover, the graphitic PN sites can also prevent the formation of byproduct Li 2 CO 3 from the corrosion of the carbon catalyst, despite its poor catalytic capability in LOBs. As a result, the sawdust‐derived P‐doped catalyst exhibits an enhanced specific capacity of ≈20 000 mAh g –1 and long cycle stability of 226 and 160 cycles at 200 and 500 mA g –1 , respectively.
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