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Method for preparing carbon clad lithium iron phosphate

A carbon-coated lithium iron phosphate and phosphate technology, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of uneven particle size, long synthesis cycle, and irregular crystal shape of the product, and achieve low cost and small grain size , The effect of simple process lines

Inactive Publication Date: 2011-04-13
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the main disadvantages of the solid-phase method are that the crystal shape of the product is irregular, the particles are not uniform, the particle size distribution range is relatively wide, and the synthesis cycle is long.

Method used

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  • Method for preparing carbon clad lithium iron phosphate
  • Method for preparing carbon clad lithium iron phosphate
  • Method for preparing carbon clad lithium iron phosphate

Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] Example 1. Put 2.6g of lithium carbonate, 8g of ammonium dihydrogen phosphate, 12.3g of ferrous oxalate and 1g of glucose into 100mL of ethanol for mixing and then directly place them in the ultrasonic radiation equipment for ultrasonic radiation treatment. The frequency of ultrasonic radiation is 20KHz, the power of ultrasonic radiation is 500W, the time of ultrasonic radiation is 1h, and the temperature is controlled at about 35°C. LiFePO obtained after filtering the mixed material treated with ultrasonic radiation 4 The precursor, after centrifugal washing treatment, was calcined at 500°C for 24 hours under the protection of nitrogen atmosphere to obtain carbon-coated lithium iron phosphate (see figure 1 , 2 ).

[0021] Using the carbon-coated lithium iron phosphate prepared in Example 1, the conductive carbon black and the binder polyvinylidene fluoride are mixed according to the mass ratio of 82:10:8, and N-methylpyrrolidone is used as a solvent, rolled into she...

Embodiment 2

[0022] Example 2. Put 55g of lithium sulfate, 198.1g of ammonium hydrogen phosphate, 173.5g of ferrous acetate and 17.1g of sucrose into 10L of ethanol for mixing and then directly place them in ultrasonic radiation equipment for ultrasonic radiation treatment. The frequency of ultrasonic radiation is 100KHz, the power of ultrasonic radiation is 5KW, the time of ultrasonic radiation is 5h, and the temperature is controlled at about 35°C. LiFePO obtained after filtering the mixed material treated with ultrasonic radiation 4 The precursor, after centrifugal washing treatment, is calcined at 800°C for 10 hours under the protection of nitrogen atmosphere to obtain carbon-coated lithium iron phosphate.

Embodiment 3

[0023] Example 3. Put 7.8g of lithium carbonate, 48.7g of ammonium phosphate, 36g of ferrous nitrate and 1.6g of starch into 1L of deionized water for mixing and then directly place them in ultrasonic radiation equipment for ultrasonic radiation treatment. The frequency of ultrasonic radiation is 50KHz, the power of ultrasonic radiation is 800W, the time of ultrasonic radiation is 5h, and the temperature is controlled at about 35°C. LiFePO obtained after filtering the mixed material treated with ultrasonic radiation 4 The precursor, after centrifugal washing treatment, was calcined at 300°C for 12 hours under the protection of nitrogen atmosphere to obtain carbon-coated lithium iron phosphate.

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Abstract

The invention discloses a method for preparing carbon clad lithium iron phosphate, belongs to the technical field of new energy materials, and aims to provide a preparation method in which preliminary materials are mixed uniformly, precursor crystal particles are small, and carbon clad lithium iron phosphate with high electrochemical performance can easily obtained in the late stage of sintering. The technical key point is that the method comprises the following steps of: preparing a lithium source, ferrite, phosphate and a carbon source according to a stoichiometric ratio of 1:1:1-1.5:0.05-0.1, throwing into solution and mixing, and directly putting in ultrasonic radiation equipment for performing ultrasonic radiation treatment; and centrifugally washing and treating LiFePO4 precursors obtained by filtration, and roasting at the temperature between 300 and 1,000 DEG C for 6 to 24 hours at a nitrogen protective atmosphere so as to prepare the carbon clad lithium iron phosphate. The method has low cost, and a simple technical route and industrial continuous production can be easily realized.

Description

technical field [0001] The invention relates to a preparation method of carbon-coated lithium iron phosphate, which belongs to the technical field of new energy materials. Background technique [0002] In recent years, as lithium-ion batteries are widely used in portable electronic products and communication tools. At the same time, the research and development of large-scale power lithium-ion batteries are becoming more and more mature. The performance of the lithium-ion battery used is good or bad, and the positive electrode material plays a decisive role in it. Commonly used cathode materials generally include LiCoO 2 , LiNiO 2 , LiMn 2 o 4 、LiCoO x Ni y mn z O, LiFePO 4 Wait. Lithium iron phosphate (LiFePO) with olivine structure 4 ) has a theoretical specific capacity of 170mAh / g, its charge and discharge potential platform is about 3.5V, good cycle performance and thermal stability, and is considered to be the most promising positive electrode material with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 刘阳杨茂萍刘大军徐小明
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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