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Preparation method of water-heated carbon cladding lithium iron phosphate

A carbon-coated technology for lithium iron phosphate and lithium iron phosphate, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of uneven carbon coating methods such as hydrothermal carbon-coated lithium iron phosphate, and achieve excellent electrochemical performance. performance, improved cycle life, and the effect of reducing the chance of side reactions

Inactive Publication Date: 2011-06-08
ZHEJIANG RICHPOWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing hydrothermal carbon-coated lithium iron phosphate that solves defects such as unevenness and looseness of traditional carbon coating methods

Method used

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  • Preparation method of water-heated carbon cladding lithium iron phosphate
  • Preparation method of water-heated carbon cladding lithium iron phosphate
  • Preparation method of water-heated carbon cladding lithium iron phosphate

Examples

Experimental program
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Embodiment 1

[0024] The preparation method of the present embodiment comprises the steps:

[0025] Step 1, take 0.1g sucrose and dissolve it in 45ml deionized water to obtain an organic solution, then slowly add lithium iron phosphate powder with a mass ratio of 10:100 to the organic solution, and then add a certain amount of dodecylsulfonic acid Sodium is used as a dispersant to disperse the lithium iron phosphate powder and fully mix it with the organic solution. The mass ratio of the added dispersant to lithium iron phosphate powder is 1~3:100. In this example, 0.03g of the dispersant is added, and finally passed through an ultrasonic mixer Stir for 10 minutes to obtain a well-dispersed lithium iron phosphate suspension;

[0026] In the second step, transfer the suspension obtained in the first step to a 60ml stainless steel reactor for reaction at a temperature of 120 degrees for 3 hours, and the corresponding pressure at this time is about 1Mpa;

[0027] In the third step, after the ...

Embodiment 2

[0031] The preparation method of the present embodiment comprises the steps:

[0032] Step 1, take 0.1g sucrose and dissolve it in 45ml deionized water to obtain an organic solution, then slowly add lithium iron phosphate powder with a mass ratio of 30:100 to the organic solution, and then add a certain amount of dodecylsulfonic acid Sodium is used as a dispersant to disperse the lithium iron phosphate powder and fully mix it with the organic solution. The mass ratio of the added dispersant to lithium iron phosphate powder is 1~3:100. In this example, 0.01g of the dispersant is added, and finally passed through an ultrasonic mixer Stir for 10 minutes to obtain a well-dispersed lithium iron phosphate suspension;

[0033] In the second step, transfer the suspension obtained in the first step to a 60ml stainless steel reactor for reaction at a temperature of 300 degrees for 10 hours, and the corresponding pressure at this time is about 3Mpa;

[0034] In the third step, after the...

Embodiment 3

[0038] The preparation method of the present embodiment comprises the steps:

[0039] The sucrose in embodiment 1 or embodiment 2 is changed into one or the mixture in glucose, soluble starch. Change sodium dodecyl sulfonate to one or a mixture of polysorbate 80 and sodium carboxymethyl cellulose. The hydrothermal reaction temperature is changed to 130, 150 or 170 degrees, and the reaction time is changed to 5 or 7 hours. The drying temperature is changed to 130 or 150 degrees, and the drying time is changed to 4 or 5 hours. The prepared lithium iron phosphate can also achieve the same effect as in Example 1 or Example 2.

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Abstract

The invention discloses a preparation method of water-heated carbon cladding lithium iron phosphate, aiming to provide a preparation method of water-heated carbon cladding lithium iron phosphate, which can overcome the deficiencies of nonuniform and loose cladding and the like of the traditional carbon cladding method. In order to solve the problem, the adopted technical scheme comprises the following steps of: Step 1. mixing lithium iron phosphate powder and organic solution according to the mass ratio of (10-30):100, adding dispersing agent, and carrying out ultrasonic stirring for certain time to obtain well dispersed suspension; Step 2. transferring the well dispersed suspension to a reaction kettle and making the well dispersed suspension react at the temperature of 120 to 300 DEG C for 3 to 10 hours; Step 3. after reaction, cooling the material to the room temperature and then filtering, and washing the material by water and ethanol in sequence; and Step 4. drying the washed material in a vacuum or inert environment at the temperature of 80 to 150 DEG C for 3 to 6 hours to obtain the water-heated carbon cladding lithium iron phosphate powder material. The water-heated carbon cladding lithium iron phosphate prepared by the preparation method has the advantages of uniform and compact cladding, long service life and the like.

Description

technical field [0001] The invention relates to a method for preparing carbon materials, in particular to a method for preparing carbon-coated lithium iron phosphate. Background technique [0002] Lithium iron phosphate has become the preferred cathode material for lithium power batteries because of its excellent safety performance and excellent cycle performance. In addition, it is also widely used in UPS power systems for mobile phones, notebook computers, digital cameras and a large number of other emerging IT products; due to phosphoric acid The defect of low electronic conductivity of lithium iron itself restricts its application in some fields. It has been proved that the mature industrialization scheme is surface coating with organic carbon and inorganic carbon, which can increase the conductivity by 7 orders of magnitude. However, due to our In the actual production, the coating of carbon has the following defects: the introduction of organic carbon will limit the gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 蒋华锋唐昌平郑金龙蔡静周勤女陈耿斌胡大伟
Owner ZHEJIANG RICHPOWER TECH
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