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Preparation method and application of b-axial LiFePO<4>/C nano flake material

A nano-flaky, axial technology, applied in the electrical field, can solve the problems of poor rate performance of lithium batteries, and achieve the effect of good lithium extraction/insertion ability and uniform grain size.

Inactive Publication Date: 2016-01-13
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a b-axis LiFePO 4 / C nanosheet material and its preparation method and application, the b axial LiFePO described 4 / C nanosheet material and its preparation method and application solve the technical problem of poor rate performance of lithium batteries in the prior art

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  • Preparation method and application of b-axial LiFePO&lt;4&gt;/C nano flake material
  • Preparation method and application of b-axial LiFePO&lt;4&gt;/C nano flake material

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Embodiment 1

[0034]Take 40.5mmol of LiOH.H 2 O was dissolved in 40 ml of ethylene glycol and magnetically stirred. After the solution was dissolved, 22.5 mmol of concentrated phosphoric acid solution was slowly added dropwise while stirring, and a white suspension could be seen. Take 15mmol of FeSO 4 .7H 2 A certain amount of ascorbic acid (FeSO 4 .7H 2 5% wt of O) was completely dissolved in 40 ml of ethylene glycol, then added to the above white suspension while stirring, and stirring was continued for 30 minutes. FeSO 4 .7H 2 O:H 3 PO 4 :LiOH·H 2 O:ethylene glycol was used as a reactant and the molar ratio was 1:1.5:2.7:1.43. The suspension was moved to a closed reaction kettle with a polytetrafluoroethylene lining. The filling degree of the autoclave was 75%. The reaction kettle was placed in a constant temperature blast drying oven, heated to 180 °C for 10 hours, and then cooled to room temperature. . The resulting gray-green precipitate was then washed repeatedly with deio...

Embodiment 2

[0036] Take 40.5mmol of LiOH.H 2 O was dissolved in 65 ml of ethylene glycol and magnetically stirred. After the solution was dissolved, 22.5 mmol of concentrated phosphoric acid solution was slowly added dropwise while stirring, and a white suspended matter could be seen. Take 15mmol of FeSO 4 .7H 2 A certain amount of ascorbic acid (FeSO 4 .7H 2 5% wt of O) was completely dissolved in 65 ml of ethylene glycol, then added to the above white suspension with stirring, and stirring was continued for 45 minutes. FeSO 4 .7H 2 O:H 3 PO 4 :LiOH·H 2 O:ethylene glycol was used as a reactant and the molar ratio was 1:1.5:2.7:2.32. The suspension was moved to a closed reaction kettle with a polytetrafluoroethylene lining. The filling degree of the autoclave was 75%. The reaction kettle was placed in a constant temperature blast drying oven, heated to 180 °C for 10 hours, and then cooled to room temperature. . The resulting gray-green precipitate was then washed repeatedly wit...

Embodiment 3

[0038] Take 40.5mmol of LiOH.H 2 O was dissolved in 80 ml of ethylene glycol and magnetically stirred. After the solution was dissolved, 22.5 mmol of concentrated phosphoric acid solution was slowly added dropwise while stirring, and a white suspended matter could be seen. Take 15mmol of FeSO 4 .7H 2 A certain amount of ascorbic acid (FeSO 4 .7H 2 5% wt of O) was completely dissolved in 80 ml of ethylene glycol, then added to the above white suspension while stirring, and stirring was continued for 60 minutes. FeSO 4 .7H 2 O:H 3 PO 4 :LiOH·H 2 O:ethylene glycol was used as a reactant and the molar ratio was 1:1.5:2.7:2.86. The suspension was moved to a closed reaction kettle with a polytetrafluoroethylene lining. The filling degree of the autoclave was 75%. The reaction kettle was placed in a constant temperature blast drying oven, heated to 180 °C for 10 hours, and then cooled to room temperature. . The resulting gray-green precipitate was then washed repeatedly wi...

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Abstract

The invention discloses a preparation method of a b-axial LiFePO4<4> / C nano flake material. The method comprises the following steps: weighing a ferric salt, a phosphoric acid, a lithium salt, ethylene glycol and an ascorbic acid; mixing the ferric salt, the phosphoric acid, the lithium salt, the ethylene glycol and the ascorbic acid and then stirring the mixed solution for 30-60 minutes; and transferring the entire mixed solution into a high pressure reactor for carrying out a solvothermal reaction to obtain a reaction liquid, wherein the ferric salt is any one of ferrous sulfate septihydrate or ferrous chloride; and the lithium salt is any one of lithium hydroxide monohydrate or anhydrous lithium hydroxide; respectively washing and drying the obtained reaction liquid with deionized water and absolute ethyl alcohol to obtain a powdery mixed precursor; controlling the drying temperature to be 60-90 DEGC; and carrying out a thermal treatment on the obtained powdery mixed precursor for 2-4 hours, so as to obtain the b-axial LiFePO<4> / C nano flake material. According to the obtained LiFePO<4> / C nano material, the thicknesses of flaky particles are about 30nm; and the crystal orientation is a (010) crystal plane.

Description

technical field [0001] The invention belongs to the field of electricity, in particular to a rechargeable battery material, specifically a b-axis LiFePO 4 / C nanosheet material and its preparation method and application. Background technique [0002] High-power lithium-ion rechargeable batteries have attracted great attention in the world because of their application in hybrid electric vehicles and pure electric vehicles. The lithium iron phosphate material with olivine structure is considered to be one of the most potential positive electrode materials in the next generation of large-scale high-rate lithium-ion batteries. Its advantages are strong chemical stability and thermal stability, and high theoretical capacity. At present, the disadvantages of lithium iron phosphate are mainly low electronic conductivity and lithium ion diffusion rate, which limit the rapid charge and discharge performance of the material. For the latter shortcoming, controlling LiFePO 4 The siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 刘艳郭海洋徐春
Owner SHANGHAI INST OF TECH
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