Fe-doped LiMnPO4@C nanofibers with high Li-ion diffusion coefficient

Summary Lithium manganese phosphate (LiMnPO4) and a series of chromium‐doped lithium manganese phosphate with variation in Cr content LiCrxMn1−xPO4 (x = 0.03, 0.06, 0.1) were prepared via conventional sol‐gel method and their dielectric properties have been explored as a function of frequency. The structure and morphology were investigated by X‐ray diffraction technique (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The influence of frequency upon electrical conductivity as well as di‐electric properties of the as‐synthesized LiCrxMn1−xPO4 materials have been analyzed by dielectric parameters and AC conductivity using impedance analyzer. It was observed that dielectric constant increased with frequency at lower chromium concentration while at higher chromium contents, the dielectric constant was decreased with increasing frequency. Hence, the composition with highest Cr content (ie, x = 0.1) is proved as best material for various applications owing to its lowest AC‐conductivity and lowest dielectric loss. Therefore, it is revealed that chromium doping is quite advantageous for performance of LiMnPO4 in device applications as Cr doped LiMnPO4 unveiled improved dielectric loss.

show abstract

“…Measured bulk density “ρ m ” of the material can be calculated with the help of Equation () 42

ρ_{m} = normalm / ((), {πr}^{2} normald)

where m is the mass and r is the radius of the pallet.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Cr doped LiMnPO ₄ cathode materials and investigation of their dielectric properties

Bibi

Khan

et al. 2021

Intl J of Energy Research

View full text Add to dashboard Cite

show abstract

“…A b value of 0.5 means that the electrode materials behave as battery property; while the b value is greater than or equal to 1 illustrating that i ( v ) = av and the response peak current varies linearly with the scan rate, which represents the ideal capacitive behavior. [ 62 ]…”

Section: Resultsmentioning

confidence: 99%

In Situ Electrospinning Synthesis of N‐Doped C Nanofibers with Uniform Embedding of Mn Doped MFe₁₋_xMn_xPO₄ (M = Li, Na) as a High Performance Cathode for Lithium/Sodium‐Ion Batteries

Chen

et al. 2020

Adv Materials Inter

View full text Add to dashboard Cite

With growing development of sustainable energy storage technology, rechargeable cells especially the lithium-ion batteries (LIBs) have been applied in home electric appliances, Using polyvinyl alcohol and N-rich polyacrylonitrile as carbon sources, uniform MFe 1-x Mn x PO 4 (M = Li, Na)/N-doped C nanofibers are synthesized by sol-gel pretreatment and an electrospinning method followed by calcination. The as-prepared nanofibers exhibit a 3D homogenous network with uniform distribution of MFe 1−x Mn x PO 4 nanoparticles. The lattice distorts after Mn-doping without altering the original crystalline structure, increasing conductivity and enhancing the efficiency of Li + /Na + diffusion. When applied for lithium ion batteries, the optimized LiFe 0.8 Mn 0.2 PO 4 /C nanofibers deliver a considerable initial capacity of 169.9 mAh g −1 with coulombic efficiency of 92.4%. It also displays the excellent cycling stability with reversible capacity of 160 mAh g −1 after 200 cycles at 0.1 C and high rate performances with the specific capacity of 93 mAh g −1 at 5 C. Furthermore, NaFe x Mn 1−x PO 4 /N-doped C nanofibers are also synthesized by the same method for sodium-ion batteries, which exhibit an initial capacity of 134 mAh g −1 and specific capacity of 106 mAh g −1 at 0.1 C and 90 mAh g −1 at 1 C after 200 cycles. Owing to the facile fabrication process, these nanofibers are promising cathodes for lithium/sodium ion batteries with excellent electrochemical performances.

show abstract

“…Hao et al studied the electrochemical behavior of fibrous LiFe x Mn 1Àx PO 4 @C (x = 0, 0.25, 0.5, 0.75, 1) composites with different Fe doping amounts. 32 The results show that the addition of Mg can improve the thermodynamic properties and the thermal stability of the redox reaction. Among them, the lithium ion diffusion coefficient of LiFe 0.5 Mn 0.5 PO 4 @C is higher, the morphology is more uniform, the battery performance is better, and its specific capacity at 0.2C is 150 mAh/g.…”

Section: Introductionmentioning

confidence: 95%

“… 29‐31 Such methods can make metal ions dispersed in LiMnPO 4 provide a conductive bridge for it, which enhances the conductive ability between particles and reduces the impedance between particles, improving the electronic conductivity of LiMnPO 4 and the charge–discharge performance of the material in essence. Hao et al studied the electrochemical behavior of fibrous LiFe x Mn 1− x PO 4 @C ( x = 0, 0.25, 0.5, 0.75, 1) composites with different Fe doping amounts 32 . The results show that the addition of Mg can improve the thermodynamic properties and the thermal stability of the redox reaction.…”

Section: Introductionmentioning

confidence: 99%

Insight into structural and electrochemical properties of Mg‐doped LiMnPO ₄ /C cathode materials with first‐principles calculation and experimental verification

Chang

Luo

et al. 2021

Intl J of Energy Research

View full text Add to dashboard Cite

The LiMnPO 4 material has the advantages of abundant raw materials, safety and environmental protection, low price, high theoretical capacity, high stable working voltage platform and so on, showing great potential in lithium-ion batteries. Dissimilar metal ion doping can essentially improve the electronic conductivity of LiMnPO 4 and the material's charge and discharge performance, which is an ideal method to improve the electrochemical performance of LiMnPO 4 . In this paper, the optimal doping concentration of Mg-doped solid solution material was calculated by first principles. At the same time, the corresponding content of LiMn 1Àx Mg x PO 4 /C cathode material was synthesized by hydrothermal method for experimental verification, so as to prepare the

show abstract

Fe-doped LiMnPO4@C nanofibers with high Li-ion diffusion coefficient

Cited by 76 publications

References 44 publications

Synthesis of Cr doped LiMnPO ₄ cathode materials and investigation of their dielectric properties

Synthesis of Cr doped LiMnPO ₄ cathode materials and investigation of their dielectric properties

In Situ Electrospinning Synthesis of N‐Doped C Nanofibers with Uniform Embedding of Mn Doped MFe₁₋_xMn_xPO₄ (M = Li, Na) as a High Performance Cathode for Lithium/Sodium‐Ion Batteries

Insight into structural and electrochemical properties of Mg‐doped LiMnPO ₄ /C cathode materials with first‐principles calculation and experimental verification

Contact Info

Product

Resources

About

Fe-doped LiMnPO4@C nanofibers with high Li-ion diffusion coefficient

Cited by 76 publications

References 44 publications

Synthesis of Cr doped LiMnPO 4 cathode materials and investigation of their dielectric properties

Synthesis of Cr doped LiMnPO 4 cathode materials and investigation of their dielectric properties

In Situ Electrospinning Synthesis of N‐Doped C Nanofibers with Uniform Embedding of Mn Doped MFe1−xMnxPO4 (M = Li, Na) as a High Performance Cathode for Lithium/Sodium‐Ion Batteries

Insight into structural and electrochemical properties of Mg‐doped LiMnPO 4 /C cathode materials with first‐principles calculation and experimental verification

Contact Info

Product

Resources

About

Synthesis of Cr doped LiMnPO ₄ cathode materials and investigation of their dielectric properties

Synthesis of Cr doped LiMnPO ₄ cathode materials and investigation of their dielectric properties

In Situ Electrospinning Synthesis of N‐Doped C Nanofibers with Uniform Embedding of Mn Doped MFe₁₋_xMn_xPO₄ (M = Li, Na) as a High Performance Cathode for Lithium/Sodium‐Ion Batteries

Insight into structural and electrochemical properties of Mg‐doped LiMnPO ₄ /C cathode materials with first‐principles calculation and experimental verification