近年來(lái),基于人們對(duì)高能量及大功率的追求,有關(guān)電池與電容概念結(jié)合的報(bào)道持續(xù)發(fā)酵,正不斷催生著新的電極材料的發(fā)現(xiàn)或反應(yīng)機(jī)理的挖掘。為了激發(fā)電池電極的高倍率性能,科學(xué)家們?cè)趥鹘y(tǒng)的脫嵌、氧化還原反應(yīng)機(jī)制的電池材料中,通過(guò)對(duì)材料的物理調(diào)控(現(xiàn)如今主要包括顆粒尺寸、空隙、比表面、導(dǎo)電性、相結(jié)構(gòu)、結(jié)晶性等),發(fā)現(xiàn)了贗電容貢獻(xiàn)的存在。相對(duì)于傳統(tǒng)電池的擴(kuò)散機(jī)制,此贗電容機(jī)制已被不斷證實(shí)具有快速充放電的特性。其中,Prof. Bruce Dunn(University of California, Los Angeles)組的工作尤為突出。然而,小編發(fā)現(xiàn)近來(lái)在各大材料及能源討論群中,大家十分關(guān)心電池中電容行為的概念,尤其是對(duì)其計(jì)算方法的不確定?,F(xiàn)小編邀請(qǐng)南洋理工大學(xué)、Dr. Dunn組訪(fǎng)問(wèn)學(xué)生:晁棟梁博士給大家稍作講解,希望能對(duì)大家的理解有所幫助。
圖1 電容性貢獻(xiàn)的CV曲線(xiàn)圖(左) 及Bruce Dunn 教授(右)
以下還有一些參考的引文:
Pseudocapacitive contributions to electrochemical energy storage in TiO2(Anatase) nanoparticles, 2007, J. Phys. Chem. C; Ordered mesoporous alpha-MoO3 with iso-oriented nanocrystalline walls for thin-film pseudocapacitors, 2010, Nat. Mater.; High-Rate Electrochemical Energy Storage Through Li+ Intercalation Pseudocapacitance, 2013, Nat. Mater.; Materials Science. Where Do Batteries End and Supercapacitors Begin? 2014, Science; Pseudocapacitive Oxide Materials for High-Rate Electrochemical Energy Storage, 2014, Energ Environ. Sci.; Mesoporous LixMn2O4 Thin Film Cathodes for Lithium-Ion Pseudocapacitors, 2016, ACS Nano; Array of nanosheets render ultrafast and high-capacity Na-ion storage by tunable pseudocapacitance, 2016, Nat. Commun.; Pseudocapacitive Na-Ion Storage Boosts High-Rate and Areal Capacity of Self-Branched 2D Layered Metal Chalcogenide Nanoarrays, 2016, ACS Nano; Generic Synthesis of Carbon Nanotube Branches on Metal Oxide Arrays Exhibiting Stable High-Rate and Long-Cycle Sodium-Ion Storage, 2016, Small;
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