LiMnyFe(1-y)PO4 micron material, preparation method thereof and application thereof

A technology of PO4 and synthesis method, which is applied in the field of doped materials, can solve problems such as instability and difficulty in obtaining material capacity, and achieve an effect that is conducive to insertion and extraction

Inactive Publication Date: 2015-09-09
JILIN INST OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yamada et al. study LiMn using XRD, Mossbauer spectroscopy, EXAFS and quantum chemical ab initio calculations y Fe 1-y PO 4 and Mn y Fe 1-y PO 4 Crystal chemistry, they found that when y>0.8 is rich in manganese (Mn y Fe 1-y )PO 4 is unstable, so when y>0.8, LiMn y Fe 1-y PO 4 and LiMnPO 4 Material capacity is difficult to obtain

Method used

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  • LiMnyFe(1-y)PO4 micron material, preparation method thereof and application thereof
  • LiMnyFe(1-y)PO4 micron material, preparation method thereof and application thereof
  • LiMnyFe(1-y)PO4 micron material, preparation method thereof and application thereof

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Embodiment 1

[0021] This embodiment provides a LiMn y Fe (1-y) PO 4 (y=0.2) the solvothermal synthesis method of micron material, comprises the following steps:

[0022] (1) Dissolve 2.5mmol LiI and 1.25mmol PVP in 30mL of benzyl alcohol solvent, stir to fully dissolve into transparent solution I;

[0023] (2) Then 0.05mmol MnCl 2 4H 2 O and 0.2 mmol FeCl 3 ·6H 2 O was dissolved in 30 mL of benzyl alcohol to form a colorless and transparent solution II;

[0024](3) Mix and stir the transparent solution I obtained in step (1) and the colorless transparent solution II obtained in step (2); then add 0.02mL of 85% H in the mixed solution 3 PO 4 , fully stirred for 20 minutes and transferred to an 80mL reaction kettle, reacted at 150°C for 48 hours, took it out to cool naturally, centrifuged with absolute ethanol and distilled water for 3 to 5 times, and dried in the air for 6 hours to obtain LiMn 0.2 Fe 0.8 PO 4 micron material.

Embodiment 2

[0026] This embodiment provides a LiMn y Fe (1-y) PO 4 (y=0.4) the solvothermal synthesis method of micron material, comprises the following steps:

[0027] (1) Dissolve 2.5mmol LiI and 1.25mmol PVP in 30mL of benzyl alcohol solvent, stir to fully dissolve into transparent solution I;

[0028] (2) Then add 0.1mmol MnCl 2 4H 2 O and 0.15 mmol FeCl 3 ·6H 2 O was dissolved in 30 mL of benzyl alcohol to form a colorless and transparent solution II;

[0029] (3) Mix and stir the transparent solution I obtained in step (1) and the colorless transparent solution II obtained in step (2); then add 0.02mL of 85% H in the mixed solution 3 PO 4 , fully stirred for 20 minutes and transferred to an 80mL reaction kettle, reacted at 150°C for 48 hours, took it out to cool naturally, centrifuged with absolute ethanol and distilled water for 3 to 5 times, and dried in the air for 6 hours to obtain LiMn 0.4 Fe 0.6 PO 4 micron material.

Embodiment 3

[0031] This embodiment provides a LiMn y Fe (1-y) PO 4 (y=0.6) the solvothermal synthesis method of micron material, comprises the following steps:

[0032] (1) Dissolve 2.5mmol LiI and 1.25mmol PVP in 30mL of benzyl alcohol solvent, stir to fully dissolve into transparent solution I;

[0033] (2) Then 0.15mmol MnCl 2 4H 2 O and 0.1 mmol FeCl 3 ·6H 2 O was dissolved in 30 mL of benzyl alcohol to form a colorless and transparent solution II;

[0034] (3) Mix and stir the transparent solution I obtained in step (1) and the colorless transparent solution II obtained in step (2); then add 0.02mL of 85% H in the mixed solution 3 PO 4 , fully stirred for 20 minutes and transferred to an 80mL reaction kettle, reacted at 150°C for 48 hours, took it out to cool naturally, centrifuged with absolute ethanol and distilled water for 3 to 5 times, and dried in the air for 6 hours to obtain LiMn 0.6 Fe 0.4 PO 4 micron material.

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Abstract

The invention discloses a LiMnyFe(1-y)PO4 micron material, a preparation method thereof and an application thereof, and belongs to the technical field of doped materials. The preparation method comprises the steps of dissolving 2.5 mmol LiI and 1.25 mmol PVP in 30 mL of benzyl alcohol to obtain a solution I; dissolving 0.05-0.15 mmol MnCl2*4H2O and 0.1-0.2 mmol FeCl3*6H2O in 30 mL of benzyl alcohol to obtain a solution II; uniformly mixing the solution I with the solution II; adding 0.02mL of 85% H3PO4 in the solution, stirring the mixed solution at 140-160 DEG C for 45-50 hours, cooling, centrifuging, separating and drying the solution to obtain the LiMnyFe(1-y)PO4 micron material. The synthesized material facilitates the embedding and abjection process of Li ions and can be well applied in the battery manufacturing field.

Description

technical field [0001] The invention belongs to the technical field of doping materials, in particular to a LiMn y Fe (1-y) PO 4 Micro-materials and their preparation methods and applications. Background technique [0002] with LiFePO 4 Same, LiMnPO 4 It also has an ordered olivine structure and belongs to the orthorhombic crystal system. LiMnPO 4 Theoretical capacity and LiFePO 4 Same for 170mAh g -1 , but it is relative to Li + The electrode potential of Li / Li is 4.1V, which is much higher than that of LiFePO 4 The 3.4V voltage platform is located in the stable electrochemical window of the existing electrolyte system. The high potential of 4.1V makes LiMnPO 4 Has the advantage of potentially high energy density, which is its relative to LiFePO 4 The greatest advantage of the LiMnPO if 4 The actual capacity is brought into play with LiFePO 4 To the same extent, its energy density will be higher than that of LiFePO 4 35% higher. In addition, the synthesis of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 陈哲陈峰徐娜孟磊于雪
Owner JILIN INST OF CHEM TECH
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