文献类型：期刊文献

英文题名：Resolving Deactivation of Low-Spin Fe Sites by Redistributing Electron Density toward High-Energy Sodium Storage

作者：Jiang, Mingwei[1];Hou, Zhidong[1];Ma, Honghao[1];Wang, Jinjin[1];Hua, Wei[1];Ren, Lingbo[1];Zhang, Yu[5];Wei, Chunguang[2];Kang, Feiyu[3,4];Wang, Jian-Gan[1]

机构：[1]Northwestern Polytech Univ & Shaanxi Joint Lab Gra, Ctr Nano Energy Mat, State Key Lab Solidificat Proc, Sch Mat Sci & Engn, Xian 710072, Peoples R China;[2]Shenzhen Cub Sci Co Ltd, Shenzhen 518052, Peoples R China;[3]Tsinghua Univ, Engn Lab Functionalized Carbon Mat, Shenzhen 518000, Peoples R China;[4]Tsinghua Univ, Grad Sch Shenzhen, Shenzhen Key Lab Graphene Based Mat, Shenzhen 518000, Peoples R China;[5]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：23

期号：22

起止页码：10423

外文期刊名：NANO LETTERS

收录：;EI(收录号：20234915155972);WOS:【SCI-EXPANDED(收录号:WOS:001108427900001)】；

基金：The research fund from the National Natural Science Foundation of China (51772249, 22109044, and 51821091) and Fundamental Research Funds for the Central Universities (3102019JC005) is highly appreciated. The TEM analysis in this work is supported by eceshi (www.eceshi.com).

语种：英文

外文关键词：Prussian blue; low-spin Fe sites; high energydensity; sodium-ion batteries; activation

摘要：Prussian blue (PB) has been an emerging class of cathode material for sodium-ion batteries due to its low cost and high theoretical capacity. However, their working voltage and capacity are substantially restricted due to the deactivation of low-spin Fe sites. Herein, we demonstrate a universal strategy to activate the low-spin Fe sites of PB by hybridizing them with the pi-pi conjugated electronic conductors. The redistribution of electron density between pi-pi conjugated conductors and PB effectively promotes the participation of low-spin Fe sites in sodium storage. Consequently, the low-spin Fe-induced plateau is greatly aroused, resulting in a high specific capacity of 148.4 mAh g(-1) and remarkable energy density of 444.2 Wh kg(-1). In addition, the excellent structural stability enables superior cycling stability over 2500 cycles and outstanding rate performance. The work will provide fundamental insight into activating the low-spin Fe sites of PB for advanced battery technologies.