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题名: Propylene oxide-assisted fast sol-gel synthesis of mesoporous and nano-structured LiFePO4/C cathode materials
作者: Wang, Fuqing1, 2;  Chen, Jian1;  Wu, Minghao1, 2;  Yi, Baolian1
关键词: Lithium iron phosphate ;  Propylene oxide ;  Sol-gel method ;  Cathode material ;  Lithium ion battery
刊名: IONICS
发表日期: 2013-03-01
DOI: 10.1007/s11581-012-0780-2
卷: 19, 期:3, 页:451-460
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Electrochemistry ;  Physics, Condensed Matter
研究领域[WOS]: Chemistry ;  Electrochemistry ;  Physics
英文摘要: LiFePO4/C nanocomposites are synthesized by a propylene oxide-assisted fast sol-gel method using FeCl3, LiNO3, NH4H2PO4, and sucrose as the starting materials. It was found that after adding propylene oxide into the solution containing the starting materials, a monolithic jelly-like FePO4 gel containing lithium and carbon source is generated in a few minutes without controlling the pH value of the solution and a time-consuming heating process. Propylene oxide plays a key role in the fast generation of the precursor gel. The final products of LiFePO4/C are obtained by sintering the dry precursor gel. The structures, micro-morphologies, and electrochemical properties of the LiFePO4/C composites are investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen adsorption-desorption analysis, electrochemical impedance spectrum, and charge-discharge cycling tests. The results indicate that the LiFePO4/C composite prepared by sintering the precursor gel at 680 A degrees C for 5 h is about 30 nm in size with a meso-porous structure (the main pore size distribution is around 3.4 nm). It delivers 166.7 and 105.8 mAh g(-1) at 0.2 and 30 C, respectively. The discharge specific capacity is 97.8 mAh g(-1) even at 40 C. The cycling performance of the prepared LiFePO4/C composite is stable. The excellent electrochemical performance of the LiFePO4/C composite is attributed to the nano-sized and mesoporous structure of LiFePO4/C and the in-situ surface coating of the carbon. It was also found that propylene oxide is crucial for the generation of mesoporous and nano-structured LiFePO4/C.
关键词[WOS]: LITHIUM IRON PHOSPHATE ;  WELL-DEFINED MACROPORES ;  ELECTROCHEMICAL PERFORMANCE ;  ROOM-TEMPERATURE ;  ION BATTERIES ;  PARTICLE-SIZE ;  PHASE ;  COMPOSITES ;  LIXFEPO4 ;  ROUTE
语种: 英语
WOS记录号: WOS:000315419600011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137850
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Lab Adv Rechargeable Batteries, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

Recommended Citation:
Wang, Fuqing,Chen, Jian,Wu, Minghao,et al. Propylene oxide-assisted fast sol-gel synthesis of mesoporous and nano-structured LiFePO4/C cathode materials[J]. IONICS,2013,19(3):451-460.
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