Method for modification preparation of composite electrode micropowder material by using vanillic acid

A composite electrode and vanillic acid technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of LiFePO4 conductivity performance is not obvious, and achieve the effect of low production cost and simple process

Inactive Publication Date: 2018-03-23
张彩缘
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But only adding Pr rare earth elements, for LiFePO 4 The

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] First take 0.98 parts of lithium acetate (CH 3 COOLi·2H 2 O, analytically pure), 1 part of ferrous oxalate (FeC 2 o 4 ・2H 2 O, analytically pure), 1 part of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 , analytically pure) and 0.02 parts of Pr powder (analytical pure) were mixed and ground in an agate jar, and after grinding for a period of time, the yellow powder turned into porridge, accompanied by the smell of acetic acid. At this time, continue grinding for 0.6 hours, and the reaction The material turns into light yellow powder, and the precursor powder is obtained. Take 5g of precursor powder and mix it evenly with 0.15g of vanillic acid (analytical pure). Under the condition of inert gas and nitrogen atmosphere at 300°C, the resulting mixture powder is heat-treated for 6h, and then the temperature is raised to 500°C. After constant temperature heat treatment for 10 h, the obtained product was naturally cooled to room temperature under the protection of a ni...

Embodiment 2

[0016] First take 0.98 parts of lithium acetate (CH 3 COOLi·2H 2 O, analytically pure), 1 part of ferrous oxalate (FeC 2 o 4 ・2H 2 O, analytically pure), 1 part of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 , analytically pure) and 0.02 parts of Pr powder (analytical pure) were mixed and ground in an agate jar, and after grinding for a period of time, the yellow powder turned into porridge, accompanied by the smell of acetic acid. At this time, continue grinding for 0.6 hours, and the reaction The material turns into light yellow powder, and the precursor powder is obtained. Take 20g of precursor powder and mix it evenly with 0.6g of vanillic acid (analytical pure). Under the condition of inert gas and nitrogen atmosphere at 350°C, the resulting mixture powder is heat-treated for 8 hours, and then the temperature is raised to 500°C. After constant temperature heat treatment for 11 hours, the obtained product was naturally cooled to room temperature under the protectio...

Embodiment 3

[0018] First take 0.97 parts of lithium acetate (CH 3 COOLi·2H 2 O, analytically pure), 1 part of ferrous oxalate (FeC 2 o 4 ・2H 2 O, analytically pure), 1 part of ammonium dihydrogen phosphate (NH 4 h 2 PO 4 , analytically pure) and 0.03 parts of Pr powder (analytical pure) were mixed and ground in an agate jar, and after grinding for a period of time, the yellow powder turned into porridge, accompanied by the smell of acetic acid. At this time, continue grinding for 0.6 hours, and the reaction The material turns into light yellow powder, and the precursor powder is obtained. Take 50g of precursor powder and mix it evenly with 2g of vanillic acid (analytically pure), put the mixture into a quartz glass tube with one end sealed, fill the inside with an appropriate amount of nitrogen, and then use the high-temperature flame to fused the other end of the open quartz tube to seal it. Put the sealed quartz glass tube into the water to verify the airtightness. If there are n...

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PUM

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Abstract

The invention discloses a method for modification preparation of a composite electrode micropowder material by using vanillic acid. The method comprises the steps: according to the atomic ratio of Li1-xYxFePO4, taking a proper amount of lithium acetate, ferrous oxalate, ammonium dihydrogen phosphate and a Pr powder, mixing, then grinding the mixed raw material with an agate mortar, grinding fullyto obtain a precursor powder, then adding a proper amount of vanillic acid, continuing to grind, after being uniform, carrying out heat treatment under the protection of an inert gas atmosphere, naturally cooling to room temperature, and thus obtaining the prepared composite electrode micropowder material modified by vanilla acid.

Description

technical field [0001] The invention relates to a vanillic acid-doped lithium ion composite electrode micropowder material and a method thereof, belonging to the field of electrode materials. Background technique [0002] At present, among lithium-ion battery materials, lithium iron phosphate (LiFePO 4 ) as a representative polyanionic structure phosphate material, has received extensive attention in the field of lithium-ion electronics due to its outstanding safety, ultra-long cycle life, and low cost. However, since lithium iron phosphate (LiFePO 4 ) has a slightly distorted hexagonal close-packed structure, in the a-c plane where lithium atoms are located, containing PO 4 Tetrahedral, PO in crystal 4 Limit Li + The movement space will affect the charge and discharge performance of lithium iron phosphate material. Therefore, LiFePO 4 The electronic and ionic conductivity of the battery is relatively low, especially under the condition of high current discharge, there ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525C01B25/45
CPCC01B25/45H01M4/364H01M4/5825H01M4/624H01M10/0525Y02E60/10
Inventor 张彩缘
Owner 张彩缘
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