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题名: A Bi-doped Li3V2(PO4)(3)/C cathode material with an enhanced high-rate capacity and long cycle stability for lithium ion batteries
作者: Cheng, Yi1, 2;  Feng, Kai1;  Zhou, Wei1, 2;  Zhang, Hongzhang1;  Li, Xianfeng1, 3;  Zhang, Huamin1, 3
刊名: DALTON TRANSACTIONS
发表日期: 2015
DOI: 10.1039/c5dt03225c
卷: 44, 期:40, 页:17579-17586
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Inorganic & Nuclear
研究领域[WOS]: Chemistry
英文摘要: Bi-doped compounds Li3V2-xBix(PO4)(3)/C (x = 0, 0.01, 0.03, 0.05, 0.07) are prepared by a sol-gel method. The effects of Bi doping on the physical and electrochemical properties of Li3V2(PO4)(3) are investigated. X-ray diffraction (XRD) analysis indicates that Bi doping does not change the monoclinic structure of Li3V2(PO4)(3). A detailed analysis of the XRD patterns suggests that Bi3+ ions partly enter into the crystal structure of Li3V2(PO4)(3) and enlarge the lattice volume of Li3V2(PO4)(3). According to the results of cycle and rate performance measurements, moderate Bi3+ doping is beneficial in improving the electrochemical properties of Li3V2(PO4)(3). Among all the samples, Li3V1.97Bi0.03(PO4)(3)/C shows the best cycle and rate performance. At 3.0-4.3 V, the initial discharge capacity of Li3V1.97Bi0.03(PO4)(3)/C is as high as 130 mA h g(-1), close to the theoretical specific capacity of 133 mA h g(-1). The capacity retention of Li3V1.97Bi0.03(PO4)(3)/C is almost 100% after 100 cycles at 3.0-4.3 V. In addition, Li3V1.97Bi0.03(PO4)(3)/C exhibits excellent low-temperature and high-rate performance. Impedance spectroscopy (EIS) and cyclic voltammetry (CV) curves indicate lower charge transfer resistance and a larger Li ion diffusion rate of Li3V1.97Bi0.03(PO4)(3)/C than the primary Li3V2(PO4)(3)/C. The excellent electrochemical performance of Li3V1.97Bi0.03(PO4)(3)/C can be attributed to its larger Li ion diffusion channels, higher electronic conductivity, higher structural stability and smaller particle size.
关键词[WOS]: ELECTROCHEMICAL PERFORMANCE ;  HYDROTHERMAL SYNTHESIS ;  BEHAVIOR ;  FE ;  COMPOSITE ;  LIMN2O4 ;  MN ;  TI
语种: 英语
WOS记录号: WOS:000362362500018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146580
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, Div Energy Storage, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100039, Peoples R China
3.Collaborat Innovat Ctr Chem Energy Mat, Dalian 116023, Peoples R China

Recommended Citation:
Cheng, Yi,Feng, Kai,Zhou, Wei,et al. A Bi-doped Li3V2(PO4)(3)/C cathode material with an enhanced high-rate capacity and long cycle stability for lithium ion batteries[J]. DALTON TRANSACTIONS,2015,44(40):17579-17586.
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