非阻塞I/O
电解质
锂(药物)
材料科学
介孔材料
阳极
化学工程
电化学
过渡金属
无机化学
电极
纳米技术
作者
Kyoung Ho Kim,Taewhan Kim,Yun Seok Choi,Wontae Lee,Woosung Choi,Jeongbae Yoon,Jin Seo Park,Yelim Kwon,Won-Sub Yoon,Ji Man Kim
标识
DOI:10.1016/j.jpowsour.2022.231135
摘要
Transition metal oxides have been intensively developed for use as anode materials to overcome the capacity limitations of commercial graphite. In this study, a highly ordered mesoporous NiO electrode material is fabricated using a hard templating method, and exhibits a reversible capacity of approximately 940 mAh g −1 that is much higher than the theoretical value based on the conversion reaction (717 mAh g −1 ). Combined analyses that include synchrotron-based X-ray techniques and controlled X-ray photoelectron spectroscopies attribute the lithium storage behaviors to both the conversion reaction of NiO framework and the reversible electrolyte-derived surface layer. Interestingly, the contribution of the reversible electrolyte-derived surface layer (∼440 mAh g −1 ) to the capacity is comparable to that of the conversion reaction with NiO (∼500 mAh g −1 ). The results also demonstrate that incomplete conversion occurs due to the high bonding energy of Ni–O in the framework during the electrochemical reaction, and prove that the distinctive nano-structural characteristics of the mesoporous NiO surface cause the reversible behavior of the electrolyte-derived surface layer. • Ordered mesoporous NiO has an abnormally high electrochemical capacity. • The abnormal high capacity is due to the electrolyte-derived surface layer. • The conversion reaction of NiO is partially irreversible during cycling.
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