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Method for preparing lithium iron phosphate by sintering lithium iron phosphate precursor and microwave sintering equipment

A technology of lithium iron phosphate and precursors, which is applied in the field of sintering preparation methods and sintering equipment for new energy battery materials, and can solve problems such as inability to step by step continuous microwave sintering, inability to achieve large-scale production, and high production costs.

Inactive Publication Date: 2013-06-26
HENAN UNION NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this utility model has the problem that step-by-step continuous microwave sintering cannot be carried out according to the process requirements of lithium iron phosphate sintering, and industrialized large-scale production cannot be realized, and the production cost is also high.

Method used

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  • Method for preparing lithium iron phosphate by sintering lithium iron phosphate precursor and microwave sintering equipment
  • Method for preparing lithium iron phosphate by sintering lithium iron phosphate precursor and microwave sintering equipment
  • Method for preparing lithium iron phosphate by sintering lithium iron phosphate precursor and microwave sintering equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Example 1: First, according to the inventor's patent application No. 200810237321.8, "Precursor of Lithium Iron Phosphate and Preparation Method of Rechargeable Battery Electrode", the precursor of lithium iron phosphate was prepared, and then iron phosphate was prepared by microwave sintering as follows lithium:

[0103] (1) Pretreatment of the lithium iron phosphate precursor material: feed it into the feeder at a rate of 50 kg per hour. The lithium iron phosphate precursor material is distributed in the pretreatment furnace section 3 of the sintering furnace through an auger conveyor. After vacuuming, nitrogen gas is input. In a nitrogen-protected non-oxidizing atmosphere, microwave heaters are used for heating. The total heating power is 12kw. Control the temperature at 90°C and heat for 30 minutes;

[0104] (2) Pre-sintering of lithium iron phosphate precursor material: in a non-oxidizing atmosphere under the protection of nitrogen, the pre-treated lithium iron ph...

Embodiment 2

[0107] Example 2: First, according to the inventor's patent application No. 200810237321.8, "Precursor of Lithium Iron Phosphate and Preparation Method of Rechargeable Battery Electrode", the precursor of Lithium Iron Phosphate was prepared, and then Lithium Iron Phosphate was prepared by sintering as follows :

[0108] (1) Pretreatment of the lithium iron phosphate precursor material: feed it into the feeder at a rate of 60 kg per hour. Distribute 15 kilograms of lithium iron phosphate precursor materials in the pretreatment furnace section 3 of the sintering furnace through an auger conveyor, vacuumize to a vacuum degree of 9 Pa, and use a microwave heater to heat in a non-oxidizing atmosphere. With a power of 15kw, heat for 15 minutes at 120°C;

[0109] (2) Pre-sintering of lithium iron phosphate precursor material: in a non-oxidizing atmosphere with a vacuum degree of less than 10 Pa, distribute the pre-treated lithium iron phosphate precursor material through the auger c...

Embodiment 3

[0111] Example 3: First, according to the inventor's patent application No. 200810237321.8, "Precursor of Lithium Iron Phosphate and Preparation Method of Rechargeable Battery Electrode", the precursor of lithium iron phosphate was prepared, and then sintered to prepare lithium iron phosphate by the following steps :

[0112] (1) Pretreatment of lithium iron phosphate precursor material: feed it into the feeder at a rate of 90 kg per hour. Distribute 15Kg of lithium iron phosphate precursor material in the pretreatment furnace section 3 of the sintering furnace through the auger conveyor, and input argon gas after vacuuming, and use a microwave heater to heat under the protection of argon gas, with a total heating power of 15kw. Heat at 90°C for 10 minutes;

[0113] (2) Pre-sintering of lithium iron phosphate precursor material: in a non-oxidizing atmosphere protected by argon, the pre-treated lithium iron phosphate precursor material is distributed in the pre-sintering furna...

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Abstract

The invention discloses a method and equipment for preparing lithium iron phosphate from a lithium iron phosphate precursor. The method comprises the three process steps of pretreatment of the lithium iron phosphate precursor material, pre-sintering and sintering; and in a non-oxidizing environment, the precursor material is heated by a certain number of microwave heaters, and the three process steps are finished by controlling treatment temperature and treatment time to finally prepare the lithium iron phosphate product. The equipment comprises a material inlet, a material feeding ventilation chamber, a pretreatment unit furnace, a pre-sintering unit furnace, a sintering unit furnace, a material discharging ventilation chamber, a cooling material discharging mechanism, a material outlet,a vacuumizing device, a protective gas input device and an equipment control circuit. In the method, the pretreatment and pre-sintering process steps are added to optimize a lithium iron phosphate microwave sintering process and solve keys problems on product quality control. The equipment provided by the invention realizes continuous microwave sintering by a plurality of unit furnaces so as to improve the sintering efficiency and realize large-scale industrial production.

Description

1. Technical field: [0001] The invention relates to the field of sintering preparation methods and sintering equipment for new energy battery materials, in particular to a method for preparing lithium iron phosphate by sintering a lithium iron phosphate precursor and microwave heating continuous production equipment. 2. Background technology: [0002] Lithium-ion batteries have the advantages of high discharge rate, wide temperature range, excellent cycle performance, good safety, environmental protection and no pollution. Since their inception, they have been widely used in portable electronic devices such as mobile phones, laptop computers, and small cameras. A generation of energy materials has been continuously promoted in the fields of electric vehicles, satellites, aerospace and military, and has broad application prospects. Cathode materials are an important part of lithium-ion batteries and the key to research and development of high-performance lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCY02E60/12Y02E60/10
Inventor 刘新保贾晓林周永刚蔡俊明李恩惠
Owner HENAN UNION NEW ENERGY
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