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Dandelion-shaped iron phosphate microspheres and preparation method thereof through electrochemical anode oxidation

An anodic oxidation method, dandelion-shaped technology, applied in electrolysis process, electrolysis components, etc., can solve the problems of high synthesis temperature, complicated operation steps, and long synthesis time of iron phosphate micro-nano particles, so as to reduce the synthesis temperature and shorten the synthesis time Effect

Inactive Publication Date: 2014-02-05
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of long synthesis time, high synthesis temperature and complicated operation steps of iron phosphate micro-nano particles prepared in the prior art, and to provide a method for preparing dandelion-shaped iron phosphate microspheres by electrochemical anodic oxidation

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  • Dandelion-shaped iron phosphate microspheres and preparation method thereof through electrochemical anode oxidation
  • Dandelion-shaped iron phosphate microspheres and preparation method thereof through electrochemical anode oxidation
  • Dandelion-shaped iron phosphate microspheres and preparation method thereof through electrochemical anode oxidation

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specific Embodiment approach 1

[0014] Specific embodiment one: In this embodiment, a method for preparing dandelion-shaped iron phosphate microspheres by electrochemical anodic oxidation is carried out according to the following steps:

[0015] 1. Cut high-purity iron foil (≥99.5%) into appropriate size;

[0016] 2. Ultrasonic cleaning of high-purity iron foil with chloroform, ethanol and deionized water respectively, and removing surface oil and impurities 2 Carry out drying treatment in middle to achieve full drying;

[0017] 3. Prepare a solution with a molar concentration ratio of phosphoric acid and ammonium fluoride of (50-10):1 as the electrolyte for anodic oxidation, and then add alkali to adjust the pH value to 2-3, wherein the ammonium fluoride concentration is less than 0.1mol / L;

[0018] 4. Use the high-purity iron foil in step 2 as the anode and the platinum wire as the cathode, add an appropriate volume of prepared electrolyte, connect the power supply, and form an electrolytic cell;

[00...

specific Embodiment approach 2

[0021] Embodiment 2: A method for preparing dandelion-shaped iron phosphate microspheres by electrochemical anodic oxidation in this embodiment differs from Embodiment 1 in that the size of the high-purity iron foil in step 1 is 0.1 mm thick and 1 cm long. , 1cm wide. The rest are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Embodiment 3: A method for preparing dandelion-shaped iron phosphate microspheres by electrochemical anodization in this embodiment differs from Embodiment 1 in that the distance between the two electrodes in step 4 is 1.5 cm to 2 cm. The rest are the same as in the first embodiment.

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Abstract

The invention discloses dandelion-shaped iron phosphate microspheres and a preparation method thereof through electrochemical anode oxidation, relating to dandelion-shaped iron phosphate microspheres and a method for preparing the dandelion-shaped iron phosphate microspheres through electrochemical anode oxidation, and aiming to solve the problems that iron phosphate micro nanoparticles prepared by the prior art are long in synthesis time, high in synthesis temperature and complex in operation step. The method disclosed by the invention comprises the steps of preparing a mixed solution of phosphoric acid and ammonium fluoride of a certain molar concentration to serve as electrolyte for anode oxidation, and generating the dandelion-shaped iron phosphate microspheres on the surface of an iron foil under conditions of certain current by taking a high-purity iron foil as an anode and a platinum sheet as a cathode. The iron phosphate obtained by the invention is used as a precursor when being used for preparing lithium iron phosphate.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a dandelion-shaped iron phosphate microsphere and a method for preparing the dandelion-shaped iron phosphate microsphere by electrochemical anodic oxidation. Background technique [0002] The energy crisis is an urgent problem to be solved in today's world, and finding clean and renewable energy has become an urgent need for mankind. Electric energy will play an important role in the future due to cleanliness, safety and convenience. Lithium-ion battery, as a kind of power supply with good mobility and convenient use, has developed rapidly in recent years. Lithium iron phosphate (LiFePO 4 ) is currently a commonly used positive electrode material in lithium-ion batteries, and the current common preparation method is in iron phosphate (FePO 4 ) based on the intercalation of lithium ions, so FePO 4 The particle size, morphology and order of LiFePO will affect the 4 charge ...

Claims

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Application Information

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IPC IPC(8): C25B1/00
Inventor 杨敏裴林娟霍莉
Owner HARBIN INST OF TECH
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