环境与能源材料LiFeO2

Molten Salt Method
• 300℃,a carbon coating. • α-LiFeO2–C nanocomposite • a significantly higher reversible capacity and excellent cycle stability (230 mAh/g at 0.5 C after 100 cycles). Even at the high rate of 3 C, the electrode showed more than 50% of the capacity at low rate (0.1 C).
固相法
• α-FeOOH+LiNO3+LiOH • an un-doped state：150 mAh/g in the 50th cycle.
100nm
XRD pattern and TEM image
Julia´n Morales, Jesu´ s Santos-Pen˜a.Highly electroactive nanosized a-LiFeO2[J]. Electrochemistry Communications,2007,9:2116–2120.
Molten Salt Synthesis Method
• a rod-like morphology with average diameter of 80nm and average length of 900 nm.
TEM image and electronic diffraction pattern
• at low temperature,alcohol used as the reaction medium; • 50 mAh/g after 50 cycles, a fairly good cycling result.
• M. Tabuchi, K. Ado, H. Kobayashi,et al. J. Solid State Chem. 141 (1998) 554. • Y. Sakurai, H. Arai, S. Okada, et al. J. Power Sources 68(1997) 711. • Y. Sakurai, H. Arai, J. Yamaki.Solid State Ionics 113-115 (1998)29.
Transparent Lithium Battery —— Transparent Electrode
• semi-transparent photovoltaics (PVs)(半透明光伏); • transparent LIB + solar cells (energy window)； • nanosized LiFeO2 grown on an indium tin oxide (ITO) substrate and in situ mixed with submicronic grains of Ag homogeneously distributed.
Ionic Exchange Reaction
• β-FeOOH +LiOH • in ethanol at 85 ◦C,24 h • reversible capacity of 65–80 mAh/g.
She-Huang Wu, Hsin-Yen Liu.Preparation of α-LiFeO2-based cathode materials by an ionic exchange method[J].Journal of Power Sources,2007,174 :789–794.
Md.Mokhlesur Rahman,Jia-Zhao Wang,Mohd Faiz Hassan,et al.Nanocrystalline porous aLiFeO2–C composite—an environmentally friendly cathode for the lithium-ion battery[J].Energy Environmental Science, 2011, 4:952–957.
• similar capacities to those of LiCoO2 and LiFePO4; • low cost; • easy preparation; But: • low operating voltage (2 V)； • poor electrochemical activity； • low capacity retention；
Leabharlann Baidu
Xiong Wang, Lisheng Gao, Fu Zhou,et al.Large-scale synthesis of a-LiFeO2 nanorods by lowtemperature molten salt synthesis (MSS) method[J].Journal of Crystal Growth,2004,265:220–223.
40%
(a) XRD patterns (b) A HRTEM image obtained from LiFeO2 particles.
The electrode has the ability to deliver capacity values above 160 mAh/g upon extensive cycling with capacity retention near to 98%, an average voltage of 3.0 V vs. Li+/Li and a specific energy close to 410 Wh/kg as a result.
• 原料：a-FeOOH, FeCl3; Fe(NO3)3, LiOH, NaOH, KOH； • 制备：在烧杯中蒸馏不同Li/Fe (1–50) 比的原料混合液，在 高压反应釜230℃下水热反应。 • 5–10 mAh/g，4.5–1.5 V.
H+/Li+ ion exchange method:
α-LiFeO2
姓名： 姜 颖
• α-LiFeO2 理论容量 282mAh/g，无毒，环 境友好，Fe储量丰富， 价格低。 • α-LiFeO2：立方晶系， Li+和Fe3+ 随机占据八 面体位点，NaCl型结 构。
• LiFeIIIO2 →xLi+ + xe-+Li1-xFeIII1-xFeIVx O2 • With x = 1, this reaction provides a capacity of 283 mAh/g
Francisco Martı´n,Elena Navarrete,Julian Morales,et al.High-energy, efficient and transparent electrode for lithium batteries.2009.Journal of Materials Chemistry,2010,20:2847–2852
END~
Julia´n Morales, Jesu´ s Santos-Pen˜a.Highly electroactive nanosized a-LiFeO2[J]. Electrochemistry Communications,2007,9:2116–2120.
Hydrothermal Method：