Fluorine-Doped LiFePO

However, two proposals about the fluorine ion occupy were given (1) the first one suggested that 3F ions replace P04 group as a whole [44, 45], and 

In the early work of Barker et al. [32] the synthesis of LiVP04p was made by a two-step approach involving the initial carbothermal preparation of a VPO4 

LiVP04p host is shown in Fig. 8.3b. In the charge profile, the two distinct peaks with a potential separation 60 mV correspond to the redox couple with the two Li(l) and Li(2) site occupancies. Typical thermal response of the fully delithiated Lii VP04F phase obtained by differential scanning calorimetry shows that, with a heat flow of 205 J g , the safety characteristics of LiVP04F is vastly superior to known oxide cathode materials (for instance 345 J g for LiMn204) [58]. 

Taking advantage of the multivalency of vanadium ions, an additional lithium insertion reaction at around 1.8 V vs. Li /Li was reported to be associated with the y3+/2+ j (jox couple [49, 56-58]. L1VP04F has two redox electric potentials based 

The incorporation of aluminum into the LiVi 3,Al3P04F framework prepared by the two-step carbothermal reduction method has generated some interesting properties (1) an almost linear decrease of the discharge capacity on the redox 

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