Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na-Ion Diffusivity for Sodium-Ion Batteries

Wang Jinjin; Kang Jinzhao; Gu Zhen-YiLiang QinghuaZhao XiangyuanWang XiaomeiGuo RuishengYu HongDu Cheng-FengWu Xing-Long

首页> 外文期刊>Advanced functional materials >Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na-Ion Diffusivity for Sodium-Ion Batteries

【24h】

Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na-Ion Diffusivity for Sodium-Ion Batteries

机译：Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na-Ion Diffusivity for Sodium-Ion Batteries

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

文献代查 >>

页面导航

摘要
著录项
相关主题

摘要

Polyanionic transition metal polyphosphate (TMPO)-type Na3V2(PO4)(2)O2F (NVPO2F) is promising as cathode for large-scale sodium-ion batteries (SIBs) on account of its considerable capacity and highly stable structure. However, the redox of transition metal and phase transitions along with the (de)intercalation of Na+ lead to its slow kinetics and inferior rate performance. Herein, chlorine (Cl) is applied as a heteropical dopant to obtain Cl-doped NVPO2F (NVPO2-xClxF) cathode material for SIBs. Density functional theory investigation reveals that Cl doping tunes the localized electronic density and structure in NVPO2F lattice, causing the electron redistribution on vanadium center and dangling anions. Hence, the NVPO2-xClxF cathode exhibits a revised redox behavior of vanadium for Na+ extraction/insertion, increases Na+ diffusion rate, as well as lowers charge transfer resistance. A Na+ storage mechanism of reversible transformations between three phases and V4+/V5+ redox couple for NVPO2-xClxF cathode is verified. The NVPO2-xClxF cathode reveals a high rate capacity of approximate to 63 mAh g(-1) at 30C and great cycle stability over 1000 cycles at 10C. More importantly, outstanding rate property (314 Wh kg(-1) at 5850 W kg(-1)) and cycling capability are obtained for the NVPO2-xClxF//3DC@Se full cell. This study demonstrates a brand-new strategy to prepare advanced cathode materials for superior SIBs.

著录项

来源
《Advanced functional materials》 |2022年第4期|2109694.1-2109694.11|共11页
作者
Wang Jinjin; Kang Jinzhao; Gu Zhen-YiLiang QinghuaZhao XiangyuanWang XiaomeiGuo RuishengYu HongDu Cheng-FengWu Xing-Long;
展开▼
作者单位

Northwestern Polytech Univ, Ctr Adv Lubricat & Seal Mat, State Key Lab Solidificat Proc, Xian 710072, Peoples R China;

Northeast Normal Univ, MOE Key Lab UV Light Emitting Mat & Technol, Changchun 130024, Jilin, Peoples R China;

Univ Melbourne, Dept Chem Engn, Melbourne, Vic 3010, AustraliaNortheast Normal Univ, MOE Key Lab UV Light Emitting Mat & Technol, Changchun 130024, Jilin, Peoples R China|Northeast Normal Univ, Dept Chem, Changchun 130024, Jilin, Peoples R China;

展开▼
收录信息
原文格式 PDF
正文语种英语
中图分类
关键词
anionic doping; cathode material; fluorophosphate; full cell; high-rate capability; sodium-ion batteries;

Localized Electron Density Redistribution in Fluorophosphate Cathode: Dangling Anion Regulation and Enhanced Na-Ion Diffusivity for Sodium-Ion Batteries

摘要

著录项

相关主题

期刊订阅