Wet method of preparing lithium ferrous phosphate and its prepared lithium ferrous phosphate

A lithium iron phosphate, wet process technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of difficulty in determining the uniform mixing time, continuous production, and prolonged grinding time, and avoid product performance. Uneven, good rate discharge performance and cycle performance, the effect of uniform mixing of raw materials

Active Publication Date: 2007-01-31
北京环宇赛尔新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The time for uniform mixing is not easy to determine, and continuous production cannot be performed;
[0006] 2. In order to ensure uniform mixing, it is time-consuming to prolong the grinding time;
[0007] 3. It is easy to produce uneven batches of products, etc.

Method used

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  • Wet method of preparing lithium ferrous phosphate and its prepared lithium ferrous phosphate
  • Wet method of preparing lithium ferrous phosphate and its prepared lithium ferrous phosphate
  • Wet method of preparing lithium ferrous phosphate and its prepared lithium ferrous phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. First prepare m=p=q=126.77 moles of solutions containing Li, Fe, P compounds, that is, LiOH.H 2 O (99.8%) 5.33kg, Fe (CH 3 COO) 2 .4H 2 O (99%) 31.50kg, H 3 PO 4 (85%) 14.62kg, be dissolved in 40,50,30kg respectively and temperature is 50 ℃ water and make solution; Above-mentioned three kinds of solutions are added into 240 liters of reactors concurrently, make it mix under 120 rev / min stirring speeds Carry out the deposition reaction of formula (4) evenly and rapidly:

[0050] (4)

[0051] The main product and each by-product form a suspension together;

[0052] 2. Add the reducing conductive additive under the condition of the stirring speed of 120 rpm, it is estimated that LiFePO 4 Yield = 126.77×157.76, about 20kg; while stirring, add 15%-3.0kg of the expected product weight to the suspension to produce carbon compounds and inert metal compounds. The content of the inert metal in the compound is the expected product weight 1% of - namely 0.51kg iner...

Embodiment 2

[0059] 1. First prepare respectively m=124.27 moles, p=q=126.80 moles containing Li, Fe, the solution of P compound, be about to 124.26 moles of LiCl (99.6%) 5.29kg, 126.80 moles of FeCl 2 .4H 2 O (99.5%) 25.34kg, 126.80 moles of (NH 4 ) 3 PO 4 .3H 2 O (99.5%) 25.89kKg, respectively dissolved in 15, 30, 80Kg and the temperature is 50 ℃ water to make a solution, and 1.268 moles of MgCl 2 .6H 2 O (98%) 263.05g dissolved in FeCl 2 In the solution; under 120 rev / min stirring speeds, divide above-mentioned three kinds of solutions and flow into 240 liters of reactors, make it mix uniformly and carry out rapidly (3 1 ) deposition reaction of formula:

[0060] (3 1 )

[0061] At this moment, the reaction product and the by-product form a suspension together;

[0062] 2. Add the reducing conductive additive under the condition of 120 rpm speed of the agitator, it is estimated that Li 0.98 Mg 0.01 FePO 4 The output is approximately equal to 126.8×157.76, that is,...

Embodiment 3

[0067]1. First prepare respectively m=120.96 moles, q=p=126.00 moles containing Li, Fe, the solution of P compound and the solution containing Zr1.26 moles, that is to say, LiH containing 120.96 moles of Li and P 2 PO 4 (98.8%) 12.724kg and 5.04 moles of phosphorus (NH 4 )H 2 PO 4 (99.5%) 0.583kg together, containing 126.00 moles of Fe (C 3 h 5 o 3 ) 2 .3H 2 O (containing Fe18.9%) 37.23kg and Zr (NO containing 1.26 moles of Zr 3 ) 4 ·5H 2 O (99%) 0.546.5kg is dissolved in 60, 60, 5kg respectively and the hot water that temperature is 50 ℃ makes solution; Under 120 rpm stirring speed, above-mentioned three kinds of solutions are added into 240 liters of reactors in parallel flow mode medium, to mix well and go quickly (3 2 ) deposition reaction of formula:

[0068] (3 2 )

[0069] At this moment, the reaction product and the by-product form a suspension together;

[0070] 2. Add the reducing conductive additive under the condition of 120 rpm speed of th...

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Abstract

The present invention provides a method for preparing ferrous lithium phosphate by using wet method. Said method includes the following steps: making required water-soluble compounds containing Li, Fe and P and containing alloying element M respectively be dissolved in water; stirring them and placing them into a reactor to obtain a suspension, in which the Li content, Fe content and P content must be met with the following formula: [mLi+n(1-m)/n M]; pFe:qPO4=1:1:1, in said formula n is chemical valence of alloying element M, m is mole number of Li, (1-m)/n is mole number of alloying element M and the P and q respectively are mole numbers of Fe and PO4; adding reduction electro-conductive additive, spray drying suspension, roasting and pulverizing so as to obtain the invented product.

Description

technical field [0001] The invention relates to a method for preparing an energy material, in particular to a method for preparing a positive electrode active material of a lithium ion battery-lithium ferrous phosphate. Background technique [0002] Lithium-ion secondary battery is a new generation of green energy, which has the advantages of high energy density, high cycle performance, low self-discharge rate, no memory effect, and wide operating temperature range. It has been widely used in many fields such as mobile phones, laptop computers, cameras, electric tools, etc. Entering the field of electric vehicles. However, the current research and application of cathode materials for lithium-ion batteries are mostly focused on LiCoO 2 , LiNiO 2 and LiMn 2 o 4 Wait. Among them, spinel LiMn 2 o 4 Low cost, good safety, but poor cycle performance and high temperature performance; LiNiO 2 The cost is low, the capacity is high, but the preparation is difficult, the mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58H01M10/0525H01M10/36
CPCY02E60/122H01M4/5825H01M10/0525C01B25/45Y02E60/10
Inventor 赵林治李文漫李荣富李春生陈庆涛
Owner 北京环宇赛尔新能源科技有限公司
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