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Method for producing lithium iron phosphate material by vacuum rotary kiln

A technology of lithium iron phosphate and process method, which is applied in the field of energy materials, can solve the problems of poor electronic conduction and ion conductivity, long sintering time of lithium iron phosphate materials, and affecting the charge and discharge capacity of materials, etc., to achieve shortened sintering time and consistency The effect of improving the repeatability of the process

Inactive Publication Date: 2008-05-28
JIANGSU RUIDI ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor electron conductivity and ion conductivity of this material, the abnormally grown LiFePO 4 Li in the particles + It is difficult to completely de-embedded and embedded, so it greatly affects the charge-discharge capacity of the material
Raw and fired materials, crystallization is not good, and the cycle performance of the material is very poor
Inhomogeneous sintering, over-burning and raw-burning phenomenon, which is the fatal shortcoming of all static methods
At the same time, the static sintering method produces lithium iron phosphate materials, which takes a long time to sinter, high energy consumption, and low production efficiency.

Method used

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  • Method for producing lithium iron phosphate material by vacuum rotary kiln
  • Method for producing lithium iron phosphate material by vacuum rotary kiln
  • Method for producing lithium iron phosphate material by vacuum rotary kiln

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Experimental program
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Effect test

Embodiment 1

[0018] FeC 2 o 4 .2H 2 O, LiH 2 PO 4 as the main raw material, with H 2 TiO 3 , Mg(OH) 2 For doping materials, according to LiFe 0.98 Ti 0.01 Mg 0.01 PO 4 Composition batching, raw material is about 200kg altogether. Powerfully pulverized to 300 mesh, then ball milled in a horizontal ball mill for 2 hours, pressed into ф8 spherical pellets, fed continuously through a hopper and a screw feeder. The rotary kiln is divided into multiple temperature zones: low-temperature pre-firing zone, medium-temperature zone, high-temperature sintering zone, and cooling zone. Each temperature zone is individually controlled by PID. The temperature in the high temperature sintering zone is set at 760°C. The length of the rotary kiln body is 8 meters, and the diameter of the internal rotating material barrel is ф650mm. The inclination angle of the rotating bucket is 5°, and the rotation rate is 5 cycles / min. It takes a total of 10 hours for the material to be fed from the end of t...

Embodiment 2

[0020] FeC 2 o 4 .2H 2 O, NH 4 h 2 PO 4 , Li 2 CO 3 As the main raw material, TiO 2 , Mg(OH) 2 For doping materials, according to LiFe 0.98 Ti 0.01 Mg 0.01 PO 4 Composition batching 200kg, add sucrose 6.7kg simultaneously. Powerfully crush to 300 mesh, then ball mill in a horizontal ball mill for 2 hours, press into ф8 spherical pellets, close the valve between the feeding bin and the feeding bin, and feed 200kg pellets continuously through the feeding hopper and the screw feeder. The rotary kiln is divided into multiple temperature zones: low-temperature pre-firing zone, medium-temperature zone, high-temperature sintering zone, and cooling zone. Each temperature zone is individually controlled by PID. The temperature in the high temperature sintering zone is set at 760°C. The length of the rotary kiln body is 8 meters, and the diameter of the internal rotating material barrel is ф650mm. The inclination angle of the rotating bucket is 5°, and the rotation rate ...

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Abstract

The invention relates to a technique method for producing lithium iron phosphate material in a vacuum rotary kiln. The invention relates to the industrial manufacturing of lithium ion battery cathode material, which is characterized in that: a continuous vacuum rotary kiln is adopted to sinter and produce lithium iron phosphate material, which realizes dynamic sintering. The invention solves the difficulties of material overburning, underburning, etc. appeared in static sintering in atmosphere protection pusher kiln, pit type furnace, etc. The rotary kiln comprises a screw-feeder, a hopper, a feeding bin, an inlet bin, a rotary barrel body, a receiving bin, a discharging bin, a furnace body, an air inlet, an air outlet and pumping port, a large gear outside the barrel body, a drive gear engaged with the large gear and a roller, etc. The material is continuously fed and discharged. Spiricle is arranged in the barrel body of the rotary kiln and the material goes forward sequentially in the barrel body. The furnace body of the outside furnace of a rotary furnace is sealed, the air is vacuumized and protection atmosphere is input. The technique line is burdening, mechanical strength grinding, mixing, milling and crushing, pressing pill, sintering in the vacuum rotary kiln, mechanical strength grinding, ball grinding, coating, conductive carbon, testing and packing. The lithium iron phosphate material produced by the invention has low energy consumption, high efficiency and good product quality.

Description

technical field [0001] The invention belongs to a process method for industrialized production of a cathode material of a lithium ion battery in the field of energy materials. Background technique [0002] Lithium iron phosphate (LiFePO) with olivine structure 4 ) material, which has a stable crystal structure. The power lithium-ion battery using LiFePO4 as the positive electrode material exhibits particularly good cycle performance, and the battery can be charged and discharged 2000 times. The lithium iron phosphate battery has strong overcharge and overdischarge resistance, and the battery can easily pass the 3C5V overcharge test. Among all cathode materials of lithium-ion batteries, LiFePO 4 It shows the best safety performance, and can manufacture high-capacity batteries with a single capacity of more than 300Ah. LiFePO with submicron particle size and high specific surface area manufactured by special manufacturing process of powder materials 4 Materials, the batte...

Claims

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Application Information

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IPC IPC(8): C01B25/45
CPCY02P20/10
Inventor 喻维杰
Owner JIANGSU RUIDI ENERGY TECH
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