DOI: 10.1016/j.scib.2020.04.010
论文题名: Plum pudding model inspired KVPO4F@3DC as high-voltage and hyperstable cathode for potassium ion batteries
作者: Liu Z. ; Wang J. ; Lu B.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2020
卷: 65, 期: 15 起始页码: 1242
结束页码: 1251
语种: 英语
中文关键词: Cathode
; High working voltage
; Plum pudding model
; Potassium ion batteries
; Potassium vanadium fluorophosphate
英文关键词: Amorphous carbon
; Cathode materials
; Cathodes
; Electric discharges
; Ions
; Potassium compounds
; Vanadium compounds
; Amorphous carbon networks
; Capacity retention
; Conductive networks
; Cycling performance
; Discharge capacities
; Electronic conductivity
; Operating voltage
; Working voltage
; Lithium-ion batteries
英文摘要: The investigation on the cathode material of potassium ion batteries (PIBs), one of the most promising alternatives to lithium ion batteries, is of great significance. Potassium vanadium fluorophosphate (KVPO4F) with a high working voltage is an appealing cathode candidate for PIBs, while the poor cycling performance and low electronic conductivity dramatically hinder the application. Herein, a plum pudding model inspired three-dimensional amorphous carbon network modified KVPO4F composite (KVPO4F@3DC) is successfully designed in this study to tackle these problems. In the composite, KVPO4F particles are homogeneously wrapped by a layer of amorphous carbon and bridged by cross-linked large area carbon sheets. As the cathode for PIBs, the KVPO4F@3DC composite exhibits a high average operating voltage about 4.10 V with a super-high discharge capacity of 102.96 mAh g−1 at 20 mA g−1. An excellent long cycle stability with a capacity retention of 85.4% over 550 cycles at 500 mA g−1 is achieved. In addition, it maintains 83.6% of its initial capacity at 50 mA g−1 after 100 cycles at 55 °C. The design of KVPO4F@3DC with plum pudding structure provides facilitative electron conductive network and stable electrode/electrode interface for electrode, successfully innovating an ultra-stable and high-performance cathode material for potassium ion batteries. © 2020 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169993
Appears in Collections: 气候变化与战略
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作者单位: School of Physics and Electronics, Hunan University, Changsha, 410082, China; College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China; State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha, 410082, China; Fujian Strait Research Institute of Industrial Graphene Technologies, Quanzhou, 362000, China
Recommended Citation:
Liu Z.,Wang J.,Lu B.. Plum pudding model inspired KVPO4F@3DC as high-voltage and hyperstable cathode for potassium ion batteries[J]. Science Bulletin,2020-01-01,65(15)