Preparation method of lithium iron phosphate

A lithium iron phosphate and preparation system technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of uneven distribution, poor batch stability, large particle size, etc., and achieve uniform heating and batch stability. High performance and uniform particle size

Active Publication Date: 2013-09-18
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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Problems solved by technology

[0004] The object of the present invention is to provide a preparation method and preparation system of lithium iron phosphate, which solves the problems of large particle size, uneven distribution and poor batch stability of the lithium iron phosphate product prepared in the prior art

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  • Preparation method of lithium iron phosphate
  • Preparation method of lithium iron phosphate
  • Preparation method of lithium iron phosphate

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Embodiment Construction

[0073] In the following, the present invention will be further described with reference to the drawings and combined with the preferred embodiments, rather than limiting the present invention.

[0074] The preparation method of lithium iron phosphate in this embodiment is in a set such as figure 1 In the ball mill rotary kiln system shown, the ball mill rotary kiln system includes a ball mill 10, a cyclone preheating device, a ball mill rotary kiln, and a cooler 20, wherein the cyclone preheating device includes a five-stage heat exchange unit and a decomposition chamber For the 30 suspension heat exchange system, it should be noted that the number of heat exchange units and decomposition chambers is not limited to this. Such as figure 1 As shown, taking the ground as the reference, from top to bottom are the first stage heat exchange unit to the fifth stage heat exchange unit, each heat exchange unit includes a cyclone tube and heat exchange tube, the cyclone tube is C1, C2, C3,...

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Abstract

The invention provides a preparation method and system of lithium iron phosphate. The preparation system comprises a ball mill, a cyclone preheating device used for preheating a material through the afterheat of the system, a ball mill rotary kiln used for milling the preheated material in grades and dynamically sintering at the same time, and a cooler. The method comprises the following steps of: mixing ferric salt, lithium salt and phosphate in molar ratio of Fe: Li: P of (0.8-1.2): (0.8-1.2): 1; adding a solvent which is 2 to 5 times the total weight of the mixture; performing ball milling for 2 to 20 hours through the ball mill; dispersing to feed into the cyclone preheating device for preheating and predecomposition; transferring into the ball mill rotary kiln for sintering and milling in grades at the same time; and discharging and feeding the product meeting the particle size requirement into the cooler for cooling to reach the room temperature so as to obtain the finished lithium iron phosphate. The preparation method is a continuous full-dynamic sintering method, and the product prepared by such method is less in agglomeration, small in particle size, high in uniformity and relatively high in quality and stability of batches.

Description

Technical field [0001] The present invention relates to a preparation method of phosphate containing two or more metals, in particular to a solid phase preparation method of lithium iron phosphate. Background technique [0002] As a new generation of green batteries, lithium ion secondary batteries have the advantages of large energy density, high working voltage, no memory effect, small self-discharge, good cycle performance, and wide operating temperature range, and are widely used. Lithium iron phosphate, a cathode material for lithium ion secondary batteries, has the advantages of good safety performance, low price, high thermal stability, good cycle performance, high theoretical capacity, high charge and discharge platform, no memory effect, and environmental friendliness. It has become a research focus of lithium ion secondary battery cathode materials. [0003] The current method of industrial production of lithium iron phosphate is mainly based on solid-phase synthesis. M...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/10
Inventor 褚晓东李宝华邢玉涛陈泓舟
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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