四方晶系
材料科学
法拉第效率
阳极
电极
离子
阴极
化学工程
功率密度
储能
锂(药物)
纳米技术
光电子学
功率(物理)
晶体结构
结晶学
物理化学
热力学
有机化学
物理
工程类
内分泌学
医学
化学
作者
Lu Zhang,Zhixuan Wei,Shiyu Yao,Yu Gao,Xu Jin,Gang Chen,Zexiang Shen,Fei Du
标识
DOI:10.1002/adma.202100210
摘要
Abstract To meet the ever‐growing demand for advanced rechargeable batteries with light weight and compact size, much effort has been devoted to improving the volumetric capacity of electrodes. Herein, an effective strategy of polymorph engineering is proposed to boost the volumetric capacity of FeSe. Owing to the inherent metallic electronic conductivity of tetragonal‐FeSe, a conductive additive‐free electrode (hereafter denoted as CA‐free) can be assembled with an enhanced sodium storage volumetric capacity of 1011 mAh cm −3 , significantly higher than semiconducting hexagonal‐FeSe. Impressively, the CA‐free electrode can achieve an extremely high active material utilization of 96.7 wt% and high initial Coulombic efficiency of 96%, superior to most of the anodes for Na‐ion storage. Moreover, the design methodology is branched out using tetragonal FeSe as the cathode for Li‐ion batteries. The CA‐free tetragonal‐FeSe electrode can achieve a high volumetric energy density of 1373 Wh L −1 and power density of 7200 W L −1 , outperforming most metal chalcogenides. Reversible conversion reactions are revealed by in situ XRD for both sodium and lithium systems. The proposed design strategy provides new insight and inspiration to aid in the ongoing quest for better electrode materials.
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