Synthesis method of lithium iron phosphate positive material for lithium ion battery

A lithium-ion battery, lithium iron phosphate technology, applied in the direction of battery electrodes, phosphorus compounds, chemical instruments and methods, etc., can solve the problem of high raw material cost, achieve uniform particle size, low production cost, maintain consistency and stability Effect

Inactive Publication Date: 2013-07-17
黄科竣 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the above-mentioned defects of high raw material cost in the preparation process of lithium iron phosphate materials for

Method used

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  • Synthesis method of lithium iron phosphate positive material for lithium ion battery
  • Synthesis method of lithium iron phosphate positive material for lithium ion battery
  • Synthesis method of lithium iron phosphate positive material for lithium ion battery

Examples

Experimental program
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Example Embodiment

[0031] Battery preparation and electrochemical performance test method

[0032] ①. Preparation of battery positive sheet:

[0033] The obtained lithium-ion battery cathode material lithium iron phosphate, conductive carbon powder, and organic binder polyvinylidene fluoride (PVDF) were mixed according to a mass ratio of 92:3:5 to obtain a mixed body, and 10 grams of the mixed powder. Add 12 grams of N-methylpyrrolidone (NMP), an organic solvent, and stir thoroughly to form a slurry, which is coated on the surface of the aluminum foil, dried, and rolled several times to obtain a battery positive electrode sheet;

[0034] ②. Battery assembly and performance test

[0035] The electrochemical performance of lithium iron phosphate was evaluated using a 2016 type half-cell. The rolled battery pole pieces are stamped into 12 mm diameter discs. After accurately weighing their mass, the mass of lithium iron phosphate in the pole pieces is calculated according to the formula composition. A diap...

Example Embodiment

[0037] Example 1

[0038] A method for synthesizing lithium iron phosphate as a positive electrode material for lithium ion batteries, which specifically includes the following steps:

[0039] (1) Add 115 parts of phosphoric acid to 400 parts of deionized water, stir to form a phosphoric acid solution, add 56 parts of reduced iron powder to the above phosphoric acid solution under stirring, and react for 2 hours, then add the resulting product to the ball mill After 2h of ball milling, the material is discharged to obtain a precursor A;

[0040] (2) Dissolve 42 parts of lithium hydroxide and 15 parts of sucrose in 250 parts of deionized water, and add the resulting lithium hydroxide solution to the precursor A obtained in step (1) under stirring, and then obtain the result after stirring. Precursor B;

[0041] (3) The precursor B obtained in step (2) is spray-dried with a small two-fluid spray dryer in the laboratory under agitation. The feed rate is controlled at 5ml / min, and the...

Example Embodiment

[0046] Example 2

[0047] A method for synthesizing lithium iron phosphate as a positive electrode material for lithium ion batteries, which specifically includes the following steps:

[0048] (1). Add 105 parts of phosphoric acid to 400 parts of deionized water and stir to form a phosphoric acid solution. Under stirring, add 50 parts of reduced iron powder to the above phosphoric acid solution and react for 2 hours, then add the resulting product to the ball mill After ball milling for 2h, the material is discharged to obtain a precursor A;

[0049] (2). Dissolve 38 parts of lithium hydroxide and 15 parts of sucrose in 250 parts of deionized water to obtain a lithium hydroxide solution, add it to the precursor A obtained in step (1) under stirring, and obtain the precursor after stirring. 物B;

[0050] (3) The precursor B obtained in step (2) is spray-dried with a small two-fluid spray dryer in the laboratory under agitation. The feed rate is controlled at 5ml / min and the temperatu...

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Abstract

The invention discloses a synthesis method of a lithium iron phosphate positive material for a lithium ion battery. The synthesis method comprises the following steps: firstly, adding 105-126 parts of phosphoric acid into 400 parts of deionized water to prepare phosphoric acid solution, adding 50-62 parts of reduced iron powder while stirring to react for 2 hours, and adding the obtained resultant into a ball mill to perform ball milling; dissolving 38-46 parts of lithium hydroxide and 15 parts of cane sugar in 250 parts of deionized water to form solution, adding the solution into the ball-milled product, evenly stirring and mixing, spray-drying at 200 DEG C and carrying out vacuum calcinations on obtained spherical lithium iron phosphate powder at the temperature of 600-750 DEG C for 2-6 hours to obtain the positive material lithium iron phosphate for the lithium ion battery. The synthesis method has the characteristics of low production cost, environment friendliness and the like. The obtained positive material for the lithium ion battery, namely lithium iron phosphate, is of a spherical structure, and has even grain size, uniform shape, consistent electrochemical performance and good stability.

Description

Technical field [0001] The present invention involves a synthesis method for a lithium ion batteries for lithium ion batteries. Background technique [0002] With the rapid development of the global economy, the consumption of resources is also increasing, and the crisis in the energy field is becoming increasingly serious.According to the survey, the global oil reserves currently being proven can only be used by humans for about 50 years, but the consumption of oil has shown a trend of year -on -year growth.Judging from the current consumer channels, various types of cars are the main aspects of oil consumption.Statistics show that in 2004, 800 million tons of gasoline was consumed, accounting for 50 % of oil consumption.At the same time, the harmful gases of automobile fuel emissions seriously pollute the human living environment.42 % of global air pollution comes from the emissions of transportation vehicles.Therefore, in the automotive industry, new energy vehicles with low d...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58C01B25/45
CPCY02E60/10
Inventor 常程康汤越邓玲王永强史运伟罗紫瑶吕靖
Owner 黄科竣
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