Method for preparing lithium ferrous phosphate nanoparticles by template induction method

A technology of lithium ferrous phosphate and nanoparticles, which is applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problem of no substantial improvement in material conductivity and large-magnification output performance, large particle agglomeration or sintering, and Increase the diffusion distance of lithium ions and other issues to achieve the effects of easy access, crystallization degree and small agglomeration, and stable structure

Inactive Publication Date: 2014-10-15
WUHAN INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The size of the particles synthesized by the sol-gel method and the emulsification drying method is small and distributed in the range of 1-100 μm, but due to the calcination treatment, the particles are agglomerated or sintered to a greater extent, which increases the diffusion distance of lithium ions in the particles, and the conductivity of the material. There is no substantial improvement in the large-magnification output performance; the hydrothermal method uses FeSO 4 、H 3 PO 4 , LiOH with a molar ratio of 1:1:3 to synthesize LiFePO with a particle size of 50-100nm 4 Particles, when the surfactant cetyltrimethylammonium bromide (CTAB) is added, the particle size can be reduced to 50nm, but the hydrothermal method requires high temperature and high pressure equipment, and it is difficult to industrialize

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  • Method for preparing lithium ferrous phosphate nanoparticles by template induction method
  • Method for preparing lithium ferrous phosphate nanoparticles by template induction method
  • Method for preparing lithium ferrous phosphate nanoparticles by template induction method

Examples

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Embodiment 1

[0040] Pretreatment of silicon wafers: The bulk silicon wafers cut into 1cm×1cm×0.5mm were ultrasonically cleaned in acetone and ultrapure water for 5 minutes, then soaked in Piranha solution at 60°C for 30 minutes, and the silicon wafers were taken out with ultrapure water Rinse with water, then blow dry with nitrogen to obtain a hydroxylated silicon-based substrate;

[0041]Preparation of 3-aminopropyl-trimethoxysilane (APTMS) thin film template: put the hydroxylated silicon-based substrate obtained through the above steps into an ethanol solution with a volume concentration of 0.2% APTMS for 1 hour for self-assembly, take out Afterwards, rinse with ethanol and ultrapure water in turn, and then blow dry with nitrogen to obtain the APTMS self-assembled film;

[0042] attached figure 1 It is the contact angle diagram of the hydroxylated silicon-based substrate prepared in Example 1. The water drop is almost completely spread out, and the contact angle is very small.

[0043]...

Embodiment 2

[0047] 1) Pretreatment of silicon wafers: The silicon wafers cut into 2cm×2cm×0.5mm were ultrasonically cleaned in acetone and ultrapure water for 15 minutes, then soaked in Piranha solution at 100°C for 60 minutes, and the silicon wafers were taken out with ultrapure Rinse with water, then blow dry with nitrogen to obtain a hydroxylated silicon-based substrate;

[0048] 2) Preparation of 3-aminopropyl-trimethoxysilane (APTMS) film template: soak the hydroxylated silicon-based substrate obtained in step 1) in 2% (volume fraction) APTMS ethanol solution for 1-2 Self-assembled within 1 hour, rinsed with ethanol and ultrapure water in turn after taking it out, and then dried with nitrogen to obtain the APTMS self-assembled film;

[0049] 3) In-situ phosphorylation of amino groups on the surface of the APTMS self-assembled film: The APTMS self-assembled film obtained in step 2) was immersed in an acetonitrile solution containing phosphorus oxychloride and 2,3,5-collidine, in which...

Embodiment 3

[0054] The method for preparing lithium iron phosphate nanoparticles by template induction method comprises the following steps:

[0055] 1) Pretreatment of silicon wafers: ultrasonically clean silicon wafers with a size of 1cm×1cm×0.5mm in acetone and ultrapure water for 10 minutes, then soak them in Piranha solution at 80°C for 45 minutes, take out the silicon wafers with ultrapure Rinse with water, then blow dry with nitrogen to obtain a hydroxylated silicon-based substrate;

[0056] 2) Preparation of 3-aminopropyl-trimethoxysilane (APTMS) film template: soak the hydroxylated silicon-based substrate obtained in step 1) in 0.5% (volume fraction) APTMS ethanol solution for 1.5 hours Self-assembled, rinsed with ethanol and ultrapure water in turn after taking it out, and then dried with nitrogen to obtain the APTMS self-assembled film;

[0057] 3) In-situ phosphorylation of amino groups on the surface of the APTMS self-assembled film: The APTMS self-assembled film obtained in...

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Abstract

The invention discloses a method for preparing lithium ferrous phosphate nanoparticles by a template induction method, which comprises the following steps: 1) pretreatment of a silicon chip to obtain a hydroxylated silicon-based substrate; 2) preparation of an APTMS silane film template; 3) In situ phosphorylation of amino groups on the surface of APTMS silane film template; 4) Preparation of lithium iron phosphate nanoparticles. The template induction method is used to prepare lithium ferrous phosphate nanoparticles, and the prepared nano-scale lithium ferrous phosphate particles have high purity and uniform particle size. The invention has rich sources of raw materials, low energy consumption in the preparation process, and the prepared nanoparticles are small in size and free of Poison and other advantages.

Description

technical field [0001] The invention relates to a method for preparing lithium iron phosphate nanoparticles by a template induction method, which belongs to the field of battery materials. Background technique [0002] With the increasingly prominent energy and environmental issues, clean energy has attracted much attention, which puts forward higher requirements for secondary power supplies. As a high-performance secondary green battery, lithium-ion batteries have been widely used in various portable electronic products and communication tools. Olivine-type lithium-ion battery cathode material LiFePO 4 With the advantages of rich raw material resources, low price, non-toxicity, environmental friendliness, high theoretical capacity, thermal stability and good cycle performance, it is the preferred cathode material for lithium-ion batteries. [0003] However, the diffusion rate of lithium ions in this electrode material is slow, and LiFePO 4 The electrical conductivity of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45B82Y30/00B82Y40/00
CPCY02E60/10
Inventor 刘善堂宋灿刘闯黄云辉
Owner WUHAN INSTITUTE OF TECHNOLOGY
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