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Method and device for continuously producing lithium iron phosphate by microwave array heating method

A lithium iron phosphate, heating technology, applied in electrical components, battery electrodes, circuits, etc., can solve problems such as unseen and no successful precedents, and achieve the effects of short heating time, consistent size, and reduced energy consumption

Inactive Publication Date: 2012-12-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Continuous production of conductive film-coated LiFePO using multistage microwave array heating 4 There is no successful precedent for the device of the material, and there is no continuous production of LiFePO by microwave heating. 4 method reporting

Method used

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  • Method and device for continuously producing lithium iron phosphate by microwave array heating method
  • Method and device for continuously producing lithium iron phosphate by microwave array heating method
  • Method and device for continuously producing lithium iron phosphate by microwave array heating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Disperse ferric phosphate into water to form a suspension with a mass ratio of 1:1; add phosphoric acid to adjust the pH value to 2, and mix it by ball milling for 10 minutes to make a paste; add in a mass ratio of 1:5 to ferric phosphate The pyrrole is ball milled and mixed for 10 minutes, the pyrrole is oxidized by the ferric iron in the ferric phosphate to polymerize, the ferric phosphate is reduced to generate ferrous phosphate, and a polypyrrole-modified ferrous phosphate paste is formed, and the molar ratio of iron:phosphorus is 1:1;

[0041] Take the paste of the above-mentioned polypyrrole modified ferrous phosphate and LiOH·H with a purity of 99.99% 2 O is based on iron: phosphorus: lithium molar ratio is 1:1:1, after stirring and mixing for 10 minutes, polyethylene glycol is added in a mass ratio of 1:0.1 to form a gel, which flows into the microwave array heating furnace through the hopper 103 Conveyor stainless steel belt 109, such as figure 1 shown. By ad...

Embodiment 2

[0043] Disperse ferric phosphate into water to form a suspension with a mass ratio of 1:3; add phosphoric acid to adjust the pH value to 3, and mix it by ball milling for 30 minutes to make a paste; add in a mass ratio of 1:7 to ferric phosphate Pyrrole is ball milled and mixed for 20 minutes, pyrrole is oxidized by ferric phosphate in ferric phosphate to polymerize, and ferric phosphate is reduced to generate ferrous phosphate, forming a polypyrrole-modified ferrous phosphate paste, and the molar ratio of iron:phosphorus is 1:1;

[0044] (2) Take the paste of the above-mentioned polypyrrole-modified ferrous phosphate and LiOH·H with a purity of 99.99%. 2 O is based on iron: phosphorus: lithium molar ratio is 1:1:1, after stirring and mixing for 30 minutes, polyethylene glycol is added in a mass ratio of 1:0.5 to form a gel, which flows into the microwave array heating furnace through the hopper 103 On the transmission stainless steel belt 109. By adjusting the feeding speed ...

Embodiment 3

[0047] Disperse ferric phosphate into water to form a suspension with a mass ratio of 1:2; add phosphoric acid to adjust the pH value to 2.5, and mix it by ball milling for 20 minutes to make a paste; add in a mass ratio of 1:6 to ferric phosphate The pyrrole is ball milled and mixed for 15 minutes, the pyrrole is oxidized by the ferric iron in the ferric phosphate to polymerize, the ferric phosphate is reduced to generate ferrous phosphate, and a polypyrrole-modified ferrous phosphate paste is formed, and the molar ratio of iron:phosphorus is 1:1;

[0048] Take the paste of the above-mentioned polypyrrole modified ferrous phosphate and LiOH·H with a purity of 99.99% 2 O is based on iron: phosphorus: lithium element molar ratio is 1: 1: 1, after stirring and mixing for 15 minutes, polyethylene glycol is added in a mass ratio of 1: 0.3 to form a gel, which flows into the microwave array heating furnace through the hopper 103 On the transmission stainless steel belt 109. By adj...

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Abstract

The invention relates to the technical field of the production of lithium ion battery anode materials, and aims to provide a method and a device for continuously producing lithium iron phosphate by a microwave array heating method. The method comprises the following steps of: preparing conductive polymer-modified ferrous phosphate paste; stirring and mixing the paste and LiOH.H2O, and adding polyethylene glycol to form gel; and allowing the gel to continuously pass through a microwave emission array which consists of a plurality of microwave generators with adjustable power for heating, and cooling to obtain a product. By utilizing the characteristic that microwave can only heat polar molecules, the defect of nonuniform distribution of the microwave illumination density of a single microwave source in space is overcome, uniform microwave illumination in space is realized, the problem of nonuniform growth speeds of crystals is effectively solved, and nonuniform crystal nucleation is avoided. By using the device and the method, a carbon film which is completely covered with LiFePO4 particles is formed, the size of LiFePO4 crystals is uniform, heating time is short, energy consumption is reduced, and large-scale production is realized.

Description

technical field [0001] The invention relates to the technical field of production of lithium-ion battery cathode materials, in particular to the continuous production of conductive film-coated nano-LiFePO by microwave array heating. 4 Materials, methods and devices. Background technique [0002] Since 1997, Padhi et al. pioneered the lithium-ion battery cathode material LiFePO 4 Since, LiFePO 4 It has become one of the research hotspots of cathode materials for rechargeable lithium-ion batteries. Compared with other lithium-ion battery cathode materials, LiFePO 4 It has its own advantages: (1) relatively high theoretical capacity (170mAh / g), stable charge and discharge voltage platform makes organic electrolytes safer in battery applications; (2) good electrode reaction reversibility; (3 ) good chemical stability and thermal stability; (4) cheap and easy to prepare; (5) pollution-free; (6) safer during handling and operation. [0003] During the charging and discharging...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 李洲鹏刘宾虹
Owner ZHEJIANG UNIV
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