Amorphous Se species anchored into enclosed carbon skeleton bridged by chemical bonding toward advanced K-Se batteries  

作　　者：Li Zhou Yongpeng Cui Dongqing Kong Wenting Feng Xiuli Gao Youguo Yan Hao Ren Han Hu Qingzhong Xue Zifeng Yan Wei Xing 

机构地区：[1]State Key Laboratory of Heavy Oil Processing,School of Material Science and Engineering,China University of Petroleum,Qingdao 266580,Shandong,China

出　　处：《Journal of Energy Chemistry》2021年第10期319-326,I0010,共9页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(51877216);the Natural Science Foundation of Shandong Province(ZR2020MB078);the Taishan Scholar Foundation(tsqn20161017);the Major Program of Shandong Province Natural Science Foundation(ZR201801280009);the Fundamental Research Funds for the Central Universities(18CX05007A,19CX05001A,19CX05002A,20CX06101A);the Postdoctoral Applied Research Program of Qingdao。

摘　　要：Potassium-selenium(K-Se)batteries have attracted significant attention as one of the most promising alternatives of lithium-ion storage systems owing to high energy density and low cost.In the design of Se-based cathode materials,however,the low utilization rate of active Se and the rapid dissolution of polyselenides seriously weaken the capacity and cycle stability.Therefore,how to make full use of Se species without loss during the charge and discharge process is the key to design high-performance Se-based cathode.In this paper,a 3 D"water cube"-like Se/C hybrid(denoted as Se-O-PCS)is constructed with the assistance of Na_(2)CO_(3) templates.Thanks to the abundant carbonate groups(CO_(3)^(2-))originated from the Na_(2)CO_(3) templates,the molten Se species are firmly anchored into the pore of carbon skeleton by strong C-O-Se bonding.Thus,this unique Se-O-PCS model not only improves the utilization of active Se species,but also can reduce the contact with the electrolyte to inhibit the shuttle effect of polyselenides.Moreover,flexible carbon skeleton gives Se-O-PCS hybrid a good electrical conductivity and excellent structural robustness.Consequently,the resultant Se-O-PCS hybrid is endowed with an obviously enhanced K-ions storage property.

关 键 词：Potassium ion storage K-Se battery Se cathode Porous carbon skeleton Na_(2)CO_(3)template 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ125.2[化学工程—无机化工]