Vanadium Modified LiFePO4 Cathode for Li-Ion Batteries

The structure and electrochemical behavior of vanadium-modified olivine was investigated. Vanadium was found to be incorporated into the olivine structure on the phosphorus site, not on the iron site, with the unit cell decreasing in size as the vanadium content increases. Material synthesized under reducing conditions with 5% vanadium gave materials with the best electrochemical performance. The rate capability of nanostructured was comparable to the best nanosized formed solvothermally while using less than the amount of carbon conductor. The vanadium does not appear to be electrochemically active within the voltage cycling window of .

[1]  Y. Chiang,et al.  Electronically conductive phospho-olivines as lithium storage electrodes , 2002, Nature materials.

[2]  Donghan Kim,et al.  Synthesis of LiFePO4 Nanoparticles in Polyol Medium and Their Electrochemical Properties , 2006 .

[3]  Jian Hong,et al.  Kinetic behavior of LiFeMgPO4 cathode material for Li-ion batteries , 2006 .

[4]  M. Whittingham,et al.  Some transition metal (oxy)phosphates and vanadium oxides for lithium batteries , 2005 .

[5]  Peter Y. Zavalij,et al.  The hydrothermal synthesis and characterization of olivines and related compounds for electrochemical applications , 2008 .

[6]  Linda F. Nazar,et al.  Approaching Theoretical Capacity of LiFePO4 at Room Temperature at High Rates , 2001 .

[7]  She-huang Wu,et al.  Improving electrochemical properties of lithium iron phosphate by addition of vanadium , 2007 .

[8]  Thomas J. Richardson,et al.  Electron Microscopy Study of the LiFePO4 to FePO4 Phase Transition , 2006 .

[9]  L. Nazar,et al.  Nano-network electronic conduction in iron and nickel olivine phosphates , 2004, Nature materials.

[10]  Chunsheng Wang,et al.  Ionic/Electronic Conducting Characteristics of LiFePO4 Cathode Materials The Determining Factors for High Rate Performance , 2007 .

[11]  W. Craig Carter,et al.  Size-Dependent Lithium Miscibility Gap in Nanoscale Li1 − x FePO4 , 2007 .

[12]  M. Whittingham,et al.  Electrical Energy Storage and Intercalation Chemistry , 1976, Science.

[13]  Christian Masquelier,et al.  Size Effects on Carbon-Free LiFePO4 Powders The Key to Superior Energy Density , 2006 .

[14]  Z. Tong,et al.  Structure and properties of LiFe0.9V0.1PO4 , 2006 .

[15]  John B. Goodenough,et al.  Mapping of Transition Metal Redox Energies in Phosphates with NASICON Structure by Lithium Intercalation , 1997 .

[16]  Peter Y. Zavalij,et al.  ε-VOPO4: Electrochemical Synthesis and Enhanced Cathode Behavior , 2005 .

[17]  J. Dahn,et al.  Reducing Carbon in LiFePO4 / C Composite Electrodes to Maximize Specific Energy, Volumetric Energy, and Tap Density , 2002 .

[18]  Peter R. Slater,et al.  Atomic-Scale Investigation of Defects, Dopants, and Lithium Transport in the LiFePO4 Olivine-Type Battery Material , 2005 .

[19]  A. Manthiram,et al.  Rapid microwave-solvothermal synthesis of phospho-olivine nanorods and their coating with a mixed conducting polymer for lithium ion batteries , 2008 .

[20]  Robert Dominko,et al.  Impact of LiFePO4 ∕ C Composites Porosity on Their Electrochemical Performance , 2005 .