Li0.995Nb0.005Mn0.85Fe0.15PO4/C as a high-performance cathode material for lithium-ion batteries

Improving LiFe0.4Mn0.6PO4 Nanoplates Performances by a Dual Modification Strategy toward Practical Application of Li-Ion Batteries

“…The content of the elements is summarized in Table 1 and it can be found that the molar ratio of Fe/Mn is approximately 4/6, which corresponds to the feeding ratio. High-resolution XPS spectra revealed that the Fe 2p spectrum (Figure 3b) is split into two peaks at about 710.9 and 724.3 eV, which correspond to Fe 2p3/2 and Fe 2p1/2, respectively [35]. The results confirm that the oxidation state of Fe is 2+.…”

First‐Principles Investigations of Lithium Manganese Phosphate Cathode Materials: Advances and Prospects

“…Until now, numerous experimental studies have confirmed the results of the aforementioned theoretical calculations. [46][47][48][49][50] Seo et al [51] conformed that the electrical conductivity of nanoporous LiMn 1Àx Fe x PO 4 composite increased remarkably with Fe contents from x = 0.2 to 0.8 (Figure 2b), leading to an increase of the capacity at 0.1C rate from 119 mAh g À1 for undoped samples to 149 mAh g À1 for x = 0.4 samples. Shiratsuchi et al [52] proved that the electronic conductivity of LiMn 0.99 M 0.01 PO 4 (M = Ti, Mg, Zr) can be improved tenfold when compared with LiMnPO 4 .…”

“…Liu et al [49] reported that after dual-doping with Fe 2þ and V 3þ , the conductivity increased by eight orders of magnitude compared to the undoped sample, with the 0.1C discharge capacity increased from 74 to 116 mAh g À1 . Lv et al [50] also confirmed that doping with Fe 2þ and Nb 5þ significantly reduces the electron and ion transfer impedance at the electrode/electrolyte interface, enhancing the electrochemical performance of LiMnPO 4 . Compared to LiMnPO 4 , the discharge capacities of the Fe-doped and Nb-doped samples after 50 cycles at 1C rate increased from 98 to 120 and 110 mAh g À1 , respectively.…”

Synthesis and Characterization of a LiFe0.6Mn0.4PO4 Olivine Cathode for Application in a New Lithium Polymer Battery

“…On the other hand, the LiMn x Fe 1 − x PO 4 may be further improved through the addition of new elements as dopants. [ 32 ] Indeed, LiFe 0.4 Mn 0.595 Cr 0.005 PO 4 /C prepared by ball milling/calcination revealed a specific capacity of 164 mAh g −1 for 50 cycles at 0.1C, [ 33 ] LiMn 0.8 Fe 0.19 Ni 0.01 PO 4 /C synthesized by solvothermal/calcination process delivered 157 mAh g −1 at 0.5C for 200 cycles, [ 34 ] Li(Mn 0.9 Fe 0.1 ) 0.95 Mg 0.05 PO 4 /C prepared by mechano‐chemical liquid‐phase activation has shown 140 mAh g −1 for 100 cycles at 1C, [ 35 ] LiMn 1/3 Fe 1/3 V 1/3 PO 4 /C achieved by ball milling/calcination delivered 122 mAh g −1 for 100 cycles at 5C, [ 36 ] Li(Mn 0.85 Fe 0.15 ) 0.92 Ti 0.08 PO 4 /C obtained by ball milling/calcination performed 144 mAh g −1 for 50 cycles at 1C, [ 37 ] LiMn 0.792 Fe 0.198 Mg 0.01 PO 4 /SGCNT synthesized by sol–gel/calcination delivered 119 mAh g −1 for 3000 cycles at 1C, [ 38 ] LiMn 0.8 Fe 0.19 Mg 0.01 PO 4 /C prepared by ball milling/calcination revealed 109 mAh g −1 at 10C, [ 39 ] LiMn 0.8 Fe 0.19 Mg 0.01 PO 4 /C synthesized by ball milling/calcination has shown 128 mAh g −1 at 5C, [ 40 ] Li 0.995 Nb 0.005 Mn 0.85 Fe 0.15 PO 4 /C prepared by ball milling/calcination revealed 146 mAh g −1 for 50 cycles at 1C, [ 41 ] LiFe 0.48 Mn 0.48 Mg 0.04 PO 4 performed 146 mAh g −1 at 0.1C, [ 42 ] Li 0.97 Na 0.03 Mn 0.8 Fe 0.2 PO 4 /C prepared by solvothermal/calcination delivered 125 mAh g −1 for 200 cycles at 0.5C, [ 43 ] Li 0.98 Na 0.02 (Fe 0.65 Mn 0.35 ) 0.97 Mg 0.03 PO 4 /C prepared by sol–gel/calcination has shown 148 mAh g −1 for 40 cycles at 0.1C, [ 44 ] LiFe 0.4 Mn 0.6 (PO 4 ) 0.985 I 0.015 prepared by ball milling/calcination revealed 122 mAh g −1 for 50 cycles at 1C, [ 45 ] and a LiFe 0.4 Mn 0.6 PO 3.97 F 0.03 synthesized by ball milling/calcination delivered 153 mAh g −1 at 0.1C. [ 46 ] However, we point out that the simplicity of our approach may actually favor the scaling up of commercial olivine cathodes with enhanced properties compared to those presently available in the market.…”