Method for preparing high-density spherical lithium iron phosphate for lithium ion power battery

A power battery, lithium iron phosphate technology, applied in electrode manufacturing, battery electrodes, chemical instruments and methods, etc., can solve problems such as fluctuations in the addition speed of iron salts and phosphorus source solutions, harsh control conditions, and fast addition speed, etc. Achieving the effects of abundant raw materials, narrow particle size distribution and high specific capacity

Inactive Publication Date: 2009-09-02
LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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Problems solved by technology

Although adopting the method disclosed in Chinese patent document CN1635648 can improve the tap density of lithium iron phosphate, there are obvious shortcomings in realizing industrialized large-scale production: 1. In industrialized production engineering, the liquid addition speed of iron salt and phosphorus source solution is controlled respectively, and the The conditions are harsh; 2. Considering the production capacity, high-concentration iron salt and phosphorus source solution will be used, and the addition speed will be fast. In actual production, the addition speed of iron salt and phosphorus source solution will fluctuate, which will affect the content of iron and phosphorus in the product Component ratio

Method used

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  • Method for preparing high-density spherical lithium iron phosphate for lithium ion power battery
  • Method for preparing high-density spherical lithium iron phosphate for lithium ion power battery
  • Method for preparing high-density spherical lithium iron phosphate for lithium ion power battery

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preparation example Construction

[0027] A preparation method for high-density spherical lithium iron phosphate for lithium-ion power batteries, comprising the following steps:

[0028] (1) acid, ferric source, phosphorus source are made into mixed aqueous solution, wherein the concentration of iron is 0.2-3mol / L, and the concentration of phosphorus is 0.2-3mol / L, and the acid consumption is the hydrogen in the acid: iron=( 0.5-5):1 (molar ratio).

[0029] (2) Prepare the alkali into an aqueous solution with a concentration of 2-12mol / L.

[0030] (3) The above-mentioned mixed aqueous solution and the aqueous solution of the alkali are respectively continuously input into the reaction kettle with stirring and a thermometer with a pump, the liquid addition rate of the mixed aqueous solution is controlled, and the liquid addition speed of the alkali aqueous solution is adjusted simultaneously, and the reaction liquid in the reaction kettle is controlled. The pH value is 1-5, and the temperature of the reaction s...

Embodiment 1

[0035] Prepare a mixed aqueous solution of hydrochloric acid, ferric chloride, and phosphoric acid, wherein the concentration of iron ions is 1.5 mol / L, the concentration of phosphoric acid is 1.5 mol / L, and the concentration of hydrochloric acid is 0.5 mol / L. Prepare an ammonia solution with a concentration of 6 mol / L. Use the metering pump to respectively input the mixed aqueous solution and the ammonia solution into the reactor that has been filled with 8 liters of deionized water in advance (the reactor volume is 30 liters) to carry out coprecipitation reaction, adjust the liquid addition speed of the ammonia solution, and control the reaction kettle. The pH value of the reaction solution is 3.5±0.05. Control the temperature in the reactor to be 65°C. After continuous feeding for 20 hours, the feeding was stopped, and the material in the reactor was discharged and filtered. Wash the solid product with deionized water at 70°C until the pH value of the washing water is gre...

Embodiment 2

[0037] Prepare a mixed aqueous solution of nitric acid, ferric nitrate, and ammonium dihydrogen phosphate, wherein the concentration of iron ions is 1.5 mol / L, the concentration of phosphate is 1.5 mol / L, and the concentration of nitric acid is 2 mol / L. Prepare an ammonia solution with a concentration of 6 mol / L. Use the metering pump to respectively input the mixed aqueous solution and the ammonia solution into the reactor that has been filled with 8 liters of deionized water in advance (the reactor volume is 30 liters) to carry out coprecipitation reaction, adjust the liquid addition speed of the ammonia solution, and control the reaction kettle. The pH value of the reaction solution is 3.8±0.05. Control the temperature in the reactor to be 55°C. After continuous feeding for 20 hours, the feeding was stopped, and the material in the reactor was discharged and filtered. Wash the solid product with deionized water at 70°C until the pH value of the washing water is greater th...

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Abstract

The invention relates to a method for preparing high-density spherical lithium iron phosphate for lithium ion power batteries, which is characterized by comprising the preparing processes: acid, a ferric iron resource and phosphor resource are mixed into mixed water solution; alkali is prepared into water solution; the mixed water solution and the alkali water solution are respectively and continuously introduced into a reaction kettle to carry out coprecipitation reaction, and a spherical iron phosphate precursor is synthesized; the precursor is used as a raw material and is evenly mixed with a lithium resource, a carbon resource and a doping metal compound, and then, the mixture is heated in a stove to obtain a spherical lithium iron phosphate powder material under a protective atmosphere. The spherical lithium iron phosphate powder material prepared by the method has freely controllable average grain diameter being from 4 microns to 15 microns, narrow distribution of the grain diameter tap density as higher as 1.4 g / cm<3> to 2.2 g / cm<3>, and has the characteristics of high specific capacity, rate discharge and good safety performance. The method has simple technical processes and is suitable for industrial mass production.

Description

technical field [0001] The invention discloses a method for preparing high-density spherical lithium iron phosphate for lithium-ion power batteries, relating to the preparation of a lithium-ion battery cathode material, in particular to a preparation method for a high-density spherical lithium iron phosphate cathode material. Background technique [0002] Lithium-ion batteries have the advantages of large specific energy, high operating voltage, wide operating temperature range, long cycle life, and small self-discharge. They are widely used in notebook computers, mobile phones, camcorders, digital cameras, mini optical drives, and handheld terminals. and other portable products, and with the improvement of existing materials and battery design technology and the emergence of new materials, lithium-ion batteries will have broad application prospects in electric vehicles, hybrid electric vehicles, uninterruptible power supplies, large-scale communication power supplies, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 李永军闫忠强江名喜刘会基朱用吴利军袁超群陶冶丁冬久李彦蓉吴静马骞邱平
Owner LANZHOU JINCHUAN NEW MATERIAL SCI & TECH
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