Tailoring a fluorophosphate as a novel 4 V cathode for lithium-ion batteries

被引:93
作者
Park, Young-Uk [1 ]
Seo, Dong-Hwa [1 ]
Kim, Byoungkook [2 ]
Hong, Kun-Pyo [3 ,4 ]
Kim, Hyungsub [1 ]
Lee, Seongsu [3 ]
Shakoor, Rana A. [5 ]
Miyasaka, Keiichi [5 ]
Tarascon, Jean-Marie [6 ]
Kang, Kisuk [1 ,7 ]
机构
[1] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 151742, South Korea
[2] Korea Adv Inst Sci & Technol, Res Anal Ctr, Taejon 305701, South Korea
[3] Korea Atom Energy Res Inst, Taejon 305600, South Korea
[4] Chungnam Natl Univ, Grad Sch Green Energy Technol, Taejon 305764, South Korea
[5] Korea Adv Inst Sci & Technol, Grad Sch EEWS WCU, Taejon 305701, South Korea
[6] Univ Picardie, CNRS, UMR 7314, F-80039 Amiens, France
[7] Seoul Natl Univ, RIAM, Dept Mat Sci & Engn, Seoul 151742, South Korea
来源
SCIENTIFIC REPORTS | 2012年 / 2卷
基金
新加坡国家研究基金会;
关键词
POSITIVE-ELECTRODE MATERIALS; LI-ION; ELECTROCHEMICAL PERFORMANCE; VANADIUM FLUOROPHOSPHATE; CRYSTAL-STRUCTURE; ROOM-TEMPERATURE; PHOSPHO-OLIVINES; HIGH-CAPACITY; INSERTION; LI2FESIO4;
D O I
10.1038/srep00704
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Lithium-ion batteries, which have been widely used to power portable electronic devices, are on the verge of being applied to new automobile applications. To expand this emerging market, however, an electrode that combines fast charging capability, long-term cycle stability, and high energy density is needed. Herein, we report a novel layered lithium vanadium fluorophosphate, Li1.1Na0.4VPO4.8F0.7, as a promising positive electrode contender. This new material has two-dimensional lithium pathways and is capable of reversibly releasing and reinserting similar to 1.1 Li+ ions at an ideal 4 V (versus Li+/Li) to give a capacity of similar to 156 mAh g(-1) (energy density of 624 Wh kg(-1)). Moreover, outstanding capacity retentions of 98% and 96% after 100 cycles were achieved at 60 degrees C and room temperature, respectively. Unexpectedly high rate capability was delivered for both charge and discharge despite the large particle size (a few microns), which promises further enhancement of power density with proper nano-engineering.
引用
收藏
页数:7
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