Elevating cyclability of an advanced KVPO4F cathode via multi-component coating strategy for high-performance potassium-ion batteries

被引：19

作者：

He, Xiao-Dong ^{[1
,2
,3
]}

Zhang, Li-Ming ^{[2
,3
]}

Jiang, Chun-Hai ^{[1
]}

Chen, Chun-Hua ^{[2
,3
]}

机构：

[1] Xiamen Univ Technol, Sch Mat Sci & Engn, Inst Adv Energy Mat, Fujian Prov Key Lab Funct Mat & Applicat, 600 Ligong Rd, Xiamen 361024, Peoples R China

[2] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Anhui, Peoples R China

[3] Univ Sci & Technol China, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Hefei 230026, Anhui, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2022年 / 433卷

基金：

美国国家科学基金会; 国家重点研发计划;

关键词：

Surface modification; Fluorophosphates; Spray drying; Full cell; In-situ X-ray diffraction; K-ION;

D O I：

10.1016/j.cej.2022.134634

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Developing high-performance electrode materials is crucial to the practical applications of K-ion batteries (KIBs) in large-scale sustainable energy storage systems. KVPO4F is a highly promising cathode material for KIBs, but is still limited by its poor cycle life. Herein, we design and synthesize a surface modified KVPO4F via a multi-component coating strategy. The optimized KVPO4F-based sample delivers a reversible capacity of 100 mA h g+1 and improved cycling performance with coulombic efficiencies up to 97.3%. Upon electrochemical K+ storage process, the KVPO4F cathode undergoes a completely reversible structural evolution, as determined by in-situ XRD characterization. Furthermore, a full KIB consisting of KVPO4F//hard carbon can exhibit a high energy density up to 337 Wh kg(-1) as well as superior capacity retention of 86% after 200 cycles.

引用

页数：8