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A kind of modified lithium iron phosphate cathode material and preparation method thereof

A technology of lithium iron phosphate and positive electrode materials, applied in the direction of positive electrodes, active material electrodes, battery electrodes, etc., can solve the problems of incomplete utilization of active materials, hindering the development and application of materials, and low ion diffusion coefficient, so as to improve the charge Effects of migration rate, first coulombic efficiency improvement, and high electrochemical activity

Active Publication Date: 2021-12-14
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, lithium iron phosphate itself also has some problems, that is, low conductivity and low ion diffusion coefficient. When charging and discharging at high current density, the active material is often not fully utilized, resulting in low efficiency and large capacity decay, which seriously hinders the development of this technology. Material development and application

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  • A kind of modified lithium iron phosphate cathode material and preparation method thereof
  • A kind of modified lithium iron phosphate cathode material and preparation method thereof

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Embodiment 1

[0027] A method for preparing a modified lithium iron phosphate positive electrode material, comprising the following steps:

[0028] (1) Preparation of carbon-coated lithium iron phosphate film by spin coating method: the titanium substrate was ultrasonically cleaned with acetone, absolute ethanol, and deionized water in sequence, and dried for later use; the titanium substrate was fixed on the centrifuge of the spin coater, Slowly add lithium iron phosphate to the aqueous solution of polyvinyl alcohol under ultrasonic conditions, the mass ratio of polyvinyl alcohol to lithium iron phosphate is 0.05:1, and mix by ball milling to obtain lithium iron phosphate slurry. The solid content of lithium iron phosphate slurry 50%; drop the lithium iron phosphate slurry on the titanium substrate, let it stand for 5 minutes, centrifuge at a rate of 2000r / min for 10s, and repeat the spin coating once to obtain a wet film with a thickness of 5 μm, and place the wet film on a high-purity He...

Embodiment 2

[0033] A method for preparing a modified lithium iron phosphate positive electrode material, comprising the following steps:

[0034] (1) Preparation of carbon-coated lithium iron phosphate film by spin coating method: the titanium substrate was ultrasonically cleaned with acetone, absolute ethanol, and deionized water in sequence, and dried for later use; the titanium substrate was fixed on the centrifuge of the spin coater, Slowly add lithium iron phosphate to polyvinyl alcohol aqueous solution under ultrasonic conditions. The mass ratio of polyvinyl alcohol to lithium iron phosphate is 0.1:1. Ball milling is performed to obtain lithium iron phosphate slurry. The solid content of lithium iron phosphate slurry is 55%; drop the lithium iron phosphate slurry on the titanium substrate, let it stand for 10 minutes, centrifuge at a rate of 2500r / min for 20s, and repeat the spin coating 3 times to obtain a wet film with a thickness of 15 μm, and place the wet film in high-purity nit...

Embodiment 3

[0039] A method for preparing a modified lithium iron phosphate positive electrode material, comprising the following steps:

[0040] (1) Preparation of carbon-coated lithium iron phosphate film by spin coating method: the titanium substrate was ultrasonically cleaned with acetone, absolute ethanol, and deionized water in sequence, and dried for later use; the titanium substrate was fixed on the centrifuge of the spin coater, Under ultrasonic conditions, lithium iron phosphate was slowly added to polyvinyl alcohol aqueous solution, the mass ratio of polyvinyl alcohol to lithium iron phosphate was 0.15:1, and ball milling was performed to obtain lithium iron phosphate slurry. The solid content of lithium iron phosphate slurry was 60%; drop the lithium iron phosphate slurry on the titanium substrate, let it stand for 15 minutes, centrifuge at a rate of 3500r / min for 60s, and repeat the spin coating 4 times to obtain a wet film with a thickness of 25 μm, and place the wet film in ...

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Abstract

The invention discloses a modified lithium iron phosphate cathode material and a preparation method thereof. The preparation method of the material comprises the following steps in sequence: preparing a carbon-coated lithium iron phosphate film by a spin coating method, and preparing a GeSbTe modified carbon-coated lithium iron phosphate film Preparation of precursors and modified lithium iron phosphate cathode materials. In the invention, the lithium iron phosphate is mixed with a carbon source reagent, a uniform wet film can be obtained on a substrate by a spin coating method, and a carbon-coated lithium iron phosphate thin film can be obtained after heat treatment. Using the electron beam evaporation method, a GeSbTe film is grown on the carbon-coated lithium iron phosphate film. After annealing, the modified lithium iron phosphate cathode material is obtained, that is, the GeSbTe modified carbon-coated lithium iron phosphate film, and the GeSbTe film is coated on phosphoric acid. The surface of lithium iron film shows higher electrochemical activity, which can improve the contact conductance between lithium iron phosphate particles and the overall conductivity of the material, reduce electrode polarization, and especially improve the rate performance of lithium iron phosphate and cycle performance at high rates .

Description

technical field [0001] The invention relates to the technical field of lithium ion battery cathode materials, in particular to a modified lithium iron phosphate cathode material and a preparation method thereof. Background technique [0002] With the reduction of the supply of fossil fuel resources and the intensification of environmental degradation caused by excessive emissions of greenhouse gases, the research and development of new renewable green and clean energy is becoming more and more important. Lithium-ion batteries have the characteristics of high discharge platform, high specific energy density, light material, and relatively large applicable temperature range, making them a secondary battery with broad application prospects. [0003] Since 1997, Padhi et al. proposed LiFePO as the cathode material for lithium-ion batteries. 4 Since, LiFePO 4 Because of its high safety, good stability, low cost and environmental friendliness, it has become one of the most poten...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/0525
CPCH01M4/366H01M4/58H01M4/583H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 刘兴亮杨茂萍夏昕李道聪陈厚梅
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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