Method for preparing lithium iron phosphate material suitable for power battery

A lithium iron phosphate, power battery technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of poor conductivity, low specific capacity, low purity of lithium iron phosphate, etc.

Inactive Publication Date: 2010-10-20
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of low purity, low specific capacity and poor conductivity of lithium iron phosphate prepared by the existing method, and provide a kind of raw material with...

Method used

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  • Method for preparing lithium iron phosphate material suitable for power battery
  • Method for preparing lithium iron phosphate material suitable for power battery
  • Method for preparing lithium iron phosphate material suitable for power battery

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preparation example Construction

[0026] A method for preparing a lithium iron phosphate material suitable for power batteries, comprising the steps of:

[0027] (1). Preparation of nanoscale lithium iron phosphate primary particles

[0028] According to the proportion of the three salts being P:Fe:Li=1:1:1, the three medicines were weighed and dissolved in water respectively, stirred with a magnetic stirrer, and the pH range of the solution was measured to be about 7. The fully stirred solution was poured into a round-bottomed flask for heating in an oil bath at a temperature of 100-130°C. After 1-2 hours of heating, a precipitate formed at the bottom. After repeated filtration and separation, primary particles of lithium iron phosphate were obtained.

[0029] (2). Spray to form secondary particles

[0030] Use a sprayer for spraying, set the spray parameters as: inlet temperature 100-150°C, outlet temperature 50-100°C, after repeated experiments, the spray parameters are in this range, and the shape of the ...

Embodiment 1

[0035] Accurately weigh 149g (NH 4 ) 3 PO 4 , 91.5g FeCl 2 , 25g LiF, and then dissolve them in 500ml of water respectively, fully dissolve and mix them with a magnetic stirrer, stir for about 20 minutes, the reagents are completely dissolved, the solution becomes a uniform solution, and the solution has no visible crystal particles by naked eyes, use the acid-base indicator The instrument measures the pH value, and the pH value should be 7. At this time, under the action of the mechanical stirring paddle (rotating speed=400 rpm), pour the three prepared solutions into the large round bottom flask successively while stirring, and use an oil bath to (Silicon oil is used in this laboratory) Heating at 120°C for 2 hours, stirring with a mechanical stirrer (speed = 400 rpm) while heating, repeatedly cleaning and filtering the solid at the bottom of the flask, and finally obtaining lithium iron phosphate once particles.

[0036] The primary particles of lithium iron phosphate are...

Embodiment 2

[0040] Accurately weigh 14.9g (NH 4 ) 3 PO 4 , 9.15g FeCl 2 , 2.5g LiF, and then dissolve them in 50ml of water, fully dissolve and mix with a magnetic stirrer, stir for about 20 minutes, the reagents are completely dissolved, and the solution becomes a uniform solution, and the solution has no visible crystal particles. Utilize the acid-base indicator to measure the pH value, and the pH value should be 7. At this time, under the action of the mechanical stirring paddle (rotating speed=400 rpm), pour the three prepared solutions into the large round bottom flask in turn while stirring. , use an oil bath (silicon oil is used in this laboratory) to heat at 120°C for 2h, while heating, use a mechanical stirrer (speed = 400 rpm) to stir, repeatedly wash and filter the solid at the bottom of the flask, and finally get Lithium iron phosphate primary particles.

[0041] The primary particles of lithium iron phosphate are sprayed to obtain secondary particles of lithium iron phosp...

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Abstract

The invention discloses a method for preparing a lithium iron phosphate material suitable for a power battery. In the method, lithium iron phosphate is taken as a substrate and the lithium iron phosphate material is prepared by mixing and sintering by a hydrothermal method, wherein the lithium iron phosphate consists of lithium salt, iron salt and phosphate; the mole ratio of lithium to iron to phosphorus is 1:1:1; the lithium salt is lithium carbonate, lithium hydroxide or lithium fluoride; the iron salt is iron acetate, ferrous chloride or iron hydroxide; and the phosphate is lithium dihydrogen phosphate, ammonium dihydrogen phosphate or triammonium phosphate. The lithium iron phosphate prepared by the method of the invention has high purity and specific capacity. Moreover, a synthesizing process of the invention has the advantages of simpleness, practicability, safety, reliability, low production cost, high yield and environmental friendliness.

Description

Technical field: [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a lithium iron phosphate material suitable for power batteries and a preparation method thereof. Background technique: [0002] Since the late 1990s, olivine-type LiFePO 4 The study of cathode materials has attracted the attention of many researchers. Lithium iron phosphate has high theoretical capacity (170mAh / g), high working voltage (voltage platform around 3.5V), appropriate mass density (3.64g / cm 3 ), small self-discharge, LiFePO at low current density 4 Li in + Almost 100% intercalation / deintercalation, long cycle life, good cycle performance, no memory effect, low price, good thermal stability, and environmental friendliness are expected to become a new generation of lithium-ion battery cathode materials. [0003] Lithium-ion batteries are widely used in various electronic devices, such as notebook computers, laptop bat...

Claims

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Application Information

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IPC IPC(8): H01M4/1397C01B25/45
CPCY02E60/122Y02E60/10
Inventor 刘石磊
Owner IRICO
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