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Method for preparing lithium iron phosphate with dynamic sintering method and sintering device thereof

A lithium iron phosphate and sintering device technology, which is applied to chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve the problems of small particles of lithium iron phosphate products, insufficient contact of sintering raw material particles, uneven mixing, etc. , to achieve the conditions of improving reaction thermodynamics and kinetics, easy discharge of gas products, and uniform heating

Active Publication Date: 2011-09-14
SHANGHAI UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a method for preparing lithium ferrous phosphate by a dynamic sintering method, which simplifies the sintering process by preparing lithium ferrous phosphate by a one-step solid-phase carbothermal reduction method, and adopts dynamic continuous sintering during sintering , so that the raw materials are heated more evenly, and the gas products are easier to discharge, so that the obtained lithium iron phosphate product has small and uniform particles and improved electrochemical performance; The sintering device solves the defects of insufficient contact between sintering raw material particles and uneven mixing, which can significantly improve the kinetic conditions of the solid-phase reaction of sintering raw materials and improve the quality of lithium iron phosphate

Method used

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  • Method for preparing lithium iron phosphate with dynamic sintering method and sintering device thereof
  • Method for preparing lithium iron phosphate with dynamic sintering method and sintering device thereof
  • Method for preparing lithium iron phosphate with dynamic sintering method and sintering device thereof

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Embodiment 1

[0040] see figure 1 , the present invention utilizes dynamic sintering method to prepare the method for ferrous phosphate lithium adopts the method that " one-step carbothermal reduction " and dynamic sintering combine, and the sintering device of the present invention is key equipment. The sintering device of the present invention includes a fixed frame 4, including a feeding device arranged on the fixed frame 4, a sintering kiln 5, a discharge valve 6 and a product discharge device, and also includes a reaction atmosphere control execution device, a sintering kiln 5 It is a double-layer structure shell, the inner layer is a shielded sintered inner hearth furnace, the outer layer is a heating layer, the sintered inner hearth furnace is equipped with a feeding device, and one side of the sintered inner hearth furnace is provided with a raw material input port. And it is sealed and connected with the discharge port of the feeding device. The other end of the sintering inner hea...

Embodiment 2

[0046] This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0047] see figure 2 , there is also a water cooler 7 between the discharge valve 6 and the vacuum receiver 8, the cavity of the water cooler 7 forms a delivery channel, the front end of the delivery channel communicates with the discharge valve 6, and the end of the delivery channel It communicates with the receiver 8.

[0048] With lithium carbonate (Li 2 CO 3 ), iron oxide (Fe 2 o 3 ), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) as the main raw material without doping ions, polypropylene powder is used as the carbon source, and the carbon source is added according to the amount of 31.6g per mole of lithium ferrous phosphate. Put the main raw materials into a wet ball mill and use ethanol as the medium for ball milling for 2 hours, add polypropylene powder and grind for another half an hour, take it out for later use. Put the ground raw materials into a hydrot...

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Abstract

The invention discloses a method for preparing lithium iron phosphate with a dynamic sintering method and a sintering device thereof, belonging to the technical field of lithium ion battery anode materials. The processing route of the method comprises the following steps of: preparing materials; ball-milling with a wet method; drying in vacuum at low temperature; sintering; preliminarily crushing; ball-milling; sifting and detecting and packaging. Since a solid phase carbothermic reduction method is combined with dynamic sintering, a sintering process is simplified, raw materials are heated more uniformly, and an obtained lithium iron phosphate product has smaller and more uniform particles and higher electrochemical performance. A special sintering device is also adopted in the method and comprises a feeding device, a double-layer sintering kiln, a discharging valve, a product discharging device and an atmosphere control execution device, wherein a sintering inner hearth cylinder of the sintering kiln is lifted in a reciprocating way and rotated. The invention has the advantages of simple process and equipment, low energy consumption, adequate material mixing, favorable uniformity and high stable performances between batches of the lithium iron phosphate and is widely applied to preparation of the lithium ion battery anode materials.

Description

technical field [0001] The invention belongs to the technical field of battery positive electrode materials, and relates to a method for preparing a lithium ion battery positive electrode material, in particular to a method for preparing a lithium iron phosphate battery positive electrode material using a dynamic sintering method and a sintering device thereof. Background technique [0002] Lithium iron phosphate is a lithium ion battery positive electrode material with an olivine structure. Its electrode potential relative to lithium is 3.5 volts. It has a high energy density and a theoretical specific capacity of 170mAh / g. It does not contain any harmful substances. Heavy metal elements, as a lithium-ion battery cathode material, have high safety, lithium iron phosphate lattice stability is good, lithium ion insertion and extraction have little effect on the lattice, so it has good reversibility, lithium iron phosphate battery cathode The material has a long cycle life, no...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/1397
CPCY02E60/122Y02E60/10
Inventor 向杰黄健曾智汪学真侯雪玲徐晖
Owner SHANGHAI UNIV
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