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Method for preparing lithium iron phosphate in ion liquid

A lithium iron phosphate, ionic liquid technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry and other directions, can solve the problems of insufficient electrochemical activity, increased cost input, large particle size of materials, etc., to meet the requirements of reducing equipment, The effect of reducing production cost and high crystallinity

Inactive Publication Date: 2011-08-10
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The solid-phase method is easy to operate and convenient for industrial production, but it has a long reaction time, large particle size of the material prepared at high temperature, uneven mixing, wide particle size distribution, insufficient electrochemical activity, and easy formation of Fe 3+ Defects such as species
The soft chemical synthesis method can control the morphology and microstructure of the product. The product has the characteristics of high crystallinity, uniform particle size, and large specific surface area, but it requires a large high-temperature and high-pressure reactor and consumes additional LiOH, which further increases the production capacity of the product. cost input

Method used

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  • Method for preparing lithium iron phosphate in ion liquid

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Effect test

Embodiment 1

[0026] A method for preparing lithium ferrous phosphate in an ionic liquid uses the ionic liquid as a reaction medium and completes it through a soft chemical synthesis method.

[0027] The ionic liquid is composed of choline chloride and urea.

[0028] The steps of the soft chemical synthesis method include:

[0029] 1) Add lithium nitrate, ferrous sulfate and triethyl phosphate into the ionic liquid, stir well to mix the raw materials evenly, exhaust the air in the reaction tank with nitrogen, and react at a constant temperature of 140°C for 96 hours;

[0030] 3) The reaction product is washed with water several times and then dried to obtain nanoscale lithium iron phosphate that can be applied to lithium ion batteries.

[0031] The addition amount of described lithium nitrate, ferrous sulfate and triethyl phosphate is 1mmol.

[0032] The ionic liquid is uniformly mixed with choline chloride and urea with a molar ratio of 1:5, and dried at 50° C. to obtain the ionic liquid...

Embodiment 2

[0036] A method for preparing lithium ferrous phosphate in an ionic liquid uses the ionic liquid as a reaction medium and completes it through a soft chemical synthesis method.

[0037] The ionic liquid is composed of choline chloride and urea.

[0038] The steps of the soft chemical synthesis method include:

[0039] 1) Add lithium nitrate, ferrous sulfate and triethyl phosphate into the ionic liquid, stir well to mix the raw materials evenly, exhaust the air in the reaction tank with nitrogen, and react at a constant temperature of 250°C for 12 hours;

[0040] 3) The reaction product is washed with water several times and then dried to obtain nanoscale lithium iron phosphate that can be applied to lithium ion batteries.

[0041] The addition amount of described lithium nitrate, ferrous sulfate and triethyl phosphate is 10 mmol.

[0042] The ionic liquid is uniformly mixed with choline chloride and urea with a molar ratio of 5:1, and dried at 200° C. to obtain the ionic liq...

Embodiment 3

[0046] A method for preparing lithium ferrous phosphate in an ionic liquid uses the ionic liquid as a reaction medium and completes it through a soft chemical synthesis method.

[0047] The ionic liquid is composed of choline chloride and urea.

[0048] The steps of the soft chemical synthesis method include:

[0049] 1) Add lithium nitrate, ferrous sulfate and triethyl phosphate into the ionic liquid, stir well to mix the raw materials evenly, exhaust the air in the reaction tank with nitrogen, and react at a constant temperature of 220 °C for 48 h;

[0050] 3) The reaction product is washed with water several times and then dried to obtain nanoscale lithium iron phosphate that can be applied to lithium ion batteries.

[0051] The addition amount of described lithium nitrate, ferrous sulfate and triethyl phosphate is 5mmol.

[0052] The ionic liquid is uniformly mixed with choline chloride and urea in a molar ratio of 3:1, and dried at 150° C. to obtain the ionic liquid use...

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Abstract

The invention relates to a method for preparing lithium iron phosphate in ion liquid. The method is implemented by taking the ion liquid as a reaction medium with a soft-chemistry synthesis method. In the method, the ion liquid is taken as the reaction medium at lower temperature, so that the method has the advantages of the conventional soft-chemistry synthesis method, and an obtained product has the characteristics of high crystallization degree, uniform particle size, large specific surface area and the like. Moreover, the vapor pressure of the ion liquid is very low, so that the requirement on a reaction for equipment is greatly lowered. Meanwhile, the consumption of additional LiOH in a reaction process is not needed, so that the production cost is lowered.

Description

technical field [0001] The invention belongs to the field of lithium ion battery electrode material preparation, and more specifically relates to a method for preparing lithium ferrous phosphate in ionic liquid. Background technique [0002] The core of lithium-ion batteries is lithium storage materials. Lithium iron phosphate (LiFePO) with olivine structure 4 ) as a new type of lithium-ion battery cathode material has the advantages of wide material sources, environmental friendliness, low price, high theoretical specific capacity (about 170 mAh / g), good thermal stability, etc., and is expected to become a new generation of alternative Lithium cobalt oxide (LiCoO 2 ) Lithium-ion secondary battery cathode material. Lithium-ion battery cathode material LiFePO 4 The preparation methods can be divided into two categories: solid-phase synthesis and soft chemical synthesis. LiFePO 4 The preparation of the most used at present is the solid-phase method. The solid-phase meth...

Claims

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Application Information

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IPC IPC(8): C01B25/45
Inventor 魏明灯李亚峰
Owner FUZHOU UNIV
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