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Lithium cobalt phosphate preparing method

A technology of lithium cobalt phosphate and phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as low crystallinity, achieve high compaction density, reduce costs, and uniform particle distribution

Active Publication Date: 2019-05-21
鲍君杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low crystallinity of the material, subsequent heat treatment is required to improve the performance of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A preparation method for lithium cobalt phosphate, which comprises the following steps:

[0042] (1) Add cobalt powder to phosphoric acid to dissolve, adjust the pH of the solution to 3.9, then finely filter to obtain cobalt solution, slurry lithium carbonate, and then pass into CO 2 Lithium carbonate slurry is completely clarified to obtain a lithium solution, prepare a polyethylene glycol solution, use the polyethylene glycol solution as a bottom solution, add the cobalt solution and lithium solution to the bottom solution under stirring, and continue the reaction after the addition is complete 50min;

[0043] (2) The material after the reaction of step (1) is spray-dried to obtain a spray-dried material, and the spray-dried material is put into a roller furnace, and nitrogen gas is introduced so that the oxygen content in the roller furnace is lower than 100ppm, and the material After passing through the heating section, heat preservation section and cooling section...

Embodiment 2

[0053] A preparation method for lithium cobalt phosphate, which comprises the following steps:

[0054] (1) Add cobalt powder to phosphoric acid to dissolve, adjust the pH of the solution to 3.9, then finely filter to obtain cobalt solution, slurry lithium carbonate, and then pass into CO 2 Lithium carbonate slurry is completely clarified to obtain a lithium solution, prepare a polyethylene glycol solution, use the polyethylene glycol solution as a bottom solution, add the cobalt solution and lithium solution to the bottom solution under stirring, and continue the reaction after the addition is complete 45min;

[0055] (2) The material after the reaction of step (1) is spray-dried to obtain a spray-dried material, and the spray-dried material is put into a roller furnace, and nitrogen gas is introduced so that the oxygen content in the roller furnace is lower than 100ppm, and the material After passing through the heating section, heat preservation section and cooling section...

Embodiment 3

[0065] A preparation method for lithium cobalt phosphate, which comprises the following steps:

[0066] (1) Add cobalt powder to phosphoric acid to dissolve, adjust the pH of the solution to 4.3, then finely filter to obtain cobalt solution, slurry lithium carbonate, and then pass into CO 2 Lithium carbonate slurry is completely clarified to obtain a lithium solution, prepare a polyethylene glycol solution, use the polyethylene glycol solution as a bottom solution, add the cobalt solution and lithium solution to the bottom solution under stirring, and continue the reaction after the addition is complete 40min;

[0067] (2) The material after the reaction of step (1) is spray-dried to obtain a spray-dried material, and the spray-dried material is put into a roller furnace, and nitrogen gas is introduced so that the oxygen content in the roller furnace is lower than 100ppm, and the material After passing through the heating section, heat preservation section and cooling section...

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Abstract

A lithium cobalt phosphate preparing method is disclosed. The method includes dissolving cobalt powder into phosphoric acid, and then performing fine filtration to obtain a cobalt solution; preparinglithium carbonate into slurry, then feeding CO2 to allow the lithium carbonate slurry to be completely clarified to obtain a lithium solution; adding the cobalt solution and the lithium solution intoa base solution that is a polyethylene glycol solution under stirring to complete material addition, and reacting the mixture; spray-drying reacted materials to obtain a spray-dried material; adding the spray-dried material into a roller furnace, feeding nitrogen, subjecting the material to a temperature rising segment, a temperature maintaining segment and a cooling segment in order, then coolinga product and discharging the product to obtain a calcined material; conveying the calcined material through a pipeline to an jet mill; after air flow crushing, performing electromagnetic iron removing and then sieving, and packaging an obtained product in vacuum. The method can achieve co-precipitation of lithium, phosphate radicals and cobalt, the polyethylene glycol is adopted as a dispersantand a carbon source, and carbon covered type lithium cobalt phosphate with uniform particle distribution can be prepared and has high capacity and high compaction density.

Description

technical field [0001] The invention relates to a method for preparing lithium cobalt phosphate, which belongs to the technical field of new energy lithium battery materials. Background technique [0002] The working voltage of lithium cobalt phosphate material can reach 4.8V, and the capacity can reach 170mAh / g. It has the same crystal structure as lithium iron phosphate, and they are all ordered olivine structures. They belong to the orthorhombic crystal system, the space group is Pmnb, and the unit cell The parameters are a=0.5922nm, b=1.0202nm, c=0.4699nm. In the crystal, O atoms are hexagonally close-packed, P atoms occupy tetrahedral gaps, and Li atoms and Co atoms occupy octahedral gaps. Octahedral CoO with edge sharing 6 Pass PO in the same direction as the C axis 4 The tetrahedra are linked into chains. Since the crystal structure is stabilized by the Co-O-P bonds, the Li + During the extraction process, the crystal rearrangement is very small and the crystal s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/36H01M4/58H01M4/62
CPCY02E60/10Y02P20/141
Inventor 鲍君杰
Owner 鲍君杰
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