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A novel preparation method for LiFePO4/C composite positive pole material

A composite cathode material, dry process technology, applied in electrode manufacturing, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of low specific capacity, poor high-current charge and discharge performance, etc., to achieve high specific capacity, uniform particle distribution, Effects suitable for mass production

Inactive Publication Date: 2009-08-12
SHANGHAI HUAMING HI TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For LiFePO 4 The material has problems such as low actual specific capacity and poor high-current charge-discharge performance, as well as the shortcomings of solid-phase method and liquid-phase precipitation method. A method for synthesizing lithium iron phosphate by liquid-phase evaporation to dryness has been developed.

Method used

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  • A novel preparation method for LiFePO4/C composite positive pole material
  • A novel preparation method for LiFePO4/C composite positive pole material
  • A novel preparation method for LiFePO4/C composite positive pole material

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Take a certain amount of lithium acetate, iron nitrate, and diammonium hydrogen phosphate according to the stoichiometric ratio, dissolve them in deionized water to form a mixed solution with a concentration of 2mol / L, and then weigh LiFePO 4 PVA with 10% theoretical mass is added to the previous mixture and stirred evenly. Then place the reaction vessel in a water bath, set the temperature of the water bath to 80°C, and the stirring rate to 100r / min. When the solution appears turbid, start ultrasonic dispersion. The ultrasonic dispersion time is 5 minutes each time, and the ultrasonic interval is 10 minutes. Ultrasonic 3 times, until the solution is evaporated to dryness to obtain the precursor, take out the precursor and place it in an infrared drying oven with the power adjusted to 250W, and dry for 10 hours to obtain a dry precursor solid, which is ground into powder for sintering. The heat treatment process increases from room temperature to 600 °C at a rate of 5 °...

Embodiment 2

[0036] Take a certain amount of lithium hydroxide, iron nitrate, and ammonium dihydrogen phosphate according to the stoichiometric ratio, dissolve them in deionized water to make a solution with a concentration of 1.5mol / L, and then weigh LiFePO 4 CTAB with 5% theoretical mass was added to the previous mixture and stirred evenly. Then place the reaction vessel in a water bath, set the temperature of the water bath to 70°C, and the stirring rate to 200r / min. When the solution appears turbid, start ultrasonic dispersion. The ultrasonic dispersion time is 6 minutes each time, and the ultrasonic interval is 15 minutes. Ultrasonic 2 times, until the solution is evaporated to dryness to obtain the precursor, take out the precursor and place it in a microwave oven, control the microwave power to 300W and heat for 15 minutes to obtain a dry precursor solid, which is then ground into powder for sintering. The heat treatment process increases from room temperature to 600 °C at a rate of...

Embodiment 3

[0038] Take a certain amount of lithium dihydrogen phosphate and iron nitrate according to the stoichiometric ratio, dissolve them in deionized water to make a solution with a concentration of 1mol / L, and then weigh LiFePO 4 10% PEG (average molecular weight: 380-400) and 5% sucrose in theoretical mass, these two mixed carbon sources are added to the previous mixed solution and stirred evenly. Then put the reaction vessel in a water bath, set the temperature of the water bath to 90°C, and the stirring rate to 150r / min. When the solution appears turbid, ultrasonically disperse it for 15 minutes. Finally, until the solution is evaporated to dryness to obtain the precursor, take out the precursor and place it side by side. In an infrared drying oven with the power adjusted to 500W, dry for 6 hours to obtain a dry precursor solid, which is then ground into powder. The heat treatment process increases from room temperature to 700 °C at a rate of 10 °C / min, and then naturally cools ...

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Abstract

The invention discloses a LiFePO4 / C composite anode material and a method for preparing the same, and in particular relates to a method for preparing a lithium ion buttery anode material. The LiFePO4 / C composite anode material is synthesized by a liquid phase evaporation drying method, and the method comprises the following steps: firstly, according to a stoichiometric ratio, weighing certain amount of lithium source compounds, iron source compounds and phosphonium source compounds to prepare mixed solution with certain concentration, and adding right amount of carbon sources; secondly, synthesizing a precursor by controlling the reaction temperature, the stirring speed and the ultrasonic dispersion; thirdly, drying and grinding the precursor; and finally, processing the precursor powder at a temperature of between 500 and 800 DEG C for 2 to 15 hours, and cooling the product to room temperature to obtain the LiFePO4 / C composite anode material. The method has the advantages of easy control, low energy consumption, short cycle, lithium source saving, low cost and the like; and the LiFePO4 / C composite anode material prepared by the method has the characteristics of high purity, small particle size, even distribution of particles, good electrochemical performance and the like.

Description

technical field [0001] The invention belongs to the technical field of energy material preparation, in particular to lithium ion battery LiFePO 4 / C composite positive electrode material and preparation method thereof. Background technique [0002] The positive electrode material is an important part of lithium-ion batteries, and α-NaFeO 2 The materials with the type structure have always been the research hotspot of cathode materials. These materials include LiCoO 2 , LiNiO 2 , LiMn 2 o 4 Wait. LiCoO 2 It is currently a large-scale commercialized cathode material with relatively mature research and excellent comprehensive performance. However, this material has obvious disadvantages, such as high price, low capacity, high toxicity, and certain safety problems. In addition, cobalt is a strategic resource with limited reserves. LiNiO 2 The cost is low and the capacity is high, but it is difficult to prepare and the material performance is extremely unstable, and the...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/36H01M4/58H01M4/38C01B25/45C01B31/02
CPCY02E60/12Y02E60/10
Inventor 马新胜徐云龙陶丽丽黄华庆赵崇军钱秀珍
Owner SHANGHAI HUAMING HI TECH GRP
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