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Preparation method for lithium iron phosphate cathode material

A technology of lithium iron phosphate and cathode material, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of low efficiency of low-viscosity slurry and poor performance of high-viscosity slurry.

Active Publication Date: 2015-01-21
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the current problem is that when using conventional spray dryers: low efficiency for low viscosity slurries and poor performance for high viscosity slurries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] test group:

[0038] Weigh 150.8g anhydrous ferric phosphate (FePO 4 ), 33.8g lithium carbonate (Li 2 CO 3 ), 23.8g glucose (C 6 h 12 o 6 ·H 2 O), respectively as phosphorus, iron source, lithium source and carbon source for synthesizing positive electrode material lithium iron phosphate. Then add 26.05g of triamine citrate as a dispersant, and 26.05g of carboxymethylcellulose ammonium as a binding agent. The above components were added with 139.6 g of pure water (the solid content of the slurry was 65%).

[0039] Control group:

[0040] Weigh 150.8g anhydrous ferric phosphate (FePO 4 ), 33.8g lithium carbonate (Li 2 CO 3 ), 23.8g glucose (C 6 h 12 o 6 ·H 2 O), respectively as phosphorus, iron source, lithium source and carbon source for synthesizing positive electrode material lithium iron phosphate. The above components were added with 112.2 g of pure water (the solid content of the slurry was 65%).

[0041]The above two groups were respectively put i...

Embodiment 2

[0048] test group:

[0049] Weigh 150.8g anhydrous ferric phosphate (FePO 4 ), 33.8g lithium carbonate (Li 2 CO 3 ), 23.8g glucose (C 6 h 12 o 6 ·H 2 O), respectively as phosphorus, iron source, lithium source and carbon source for synthesizing positive electrode material lithium iron phosphate. Then add 16.6g of polyammonium methacrylate as a dispersant, and 11.8g of polyethylene oxide as a binder. The above components were added with 127.5 g of pure water (the solid content of the slurry was 65%).

[0050] Control group:

[0051] Weigh 150.8g anhydrous ferric phosphate (FePO 4 ), 33.8g lithium carbonate (Li 2 CO 3 ), 23.8g glucose (C 6 h 12 o 6 ·H 2 O), respectively as phosphorus, iron source, lithium source and carbon source for synthesizing positive electrode material lithium iron phosphate. The above components were added with 112.2 g of pure water (the solid content of the slurry was 65%).

[0052] The above two groups were respectively put into a stirri...

Embodiment 3

[0058] test group:

[0059] Weigh 150.8g anhydrous ferric phosphate (FePO 4 ), 33.8g lithium carbonate (Li 2 CO 3 ), 23.8g glucose (C 6 h 12 o 6 ·H 2 O), respectively as phosphorus, iron source, lithium source and carbon source for synthesizing positive electrode material lithium iron phosphate. Then add 8.6g polyammonium methacrylate as a dispersant, and 10.5g gum arabic powder as a binding agent. The above components were added with 422.5 g of pure water (the solid content of the slurry was 35%).

[0060] Control group:

[0061] Weigh 150.8g anhydrous ferric phosphate (FePO 4 ), 33.8g lithium carbonate (Li 2 CO 3 ), 23.8g glucose (C 6 h 12 o 6 ·H 2 O), respectively as phosphorus, iron source, lithium source and carbon source for synthesizing positive electrode material lithium iron phosphate. The above components were added with 387.0 g of pure water (the solid content of the slurry was 35%).

[0062] Put the above two groups into the stirring mill for dispe...

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Abstract

The invention provides a preparation method for a lithium iron phosphate cathode material. The preparation method comprises: mixing ferric phosphate, a lithium source, a carbon source, a dispersant, a binder and water, and performing stirring, grinding and spray drying processing to obtain a lithium iron phosphate precursor, roasting the lithium iron phosphate precursor in a protective gas atmosphere, and cooling to obtain the lithium iron phosphate cathode material. During preparation of the lithium iron phosphate precursor, the dispersant and the binder are also added, so that the low viscosity of the slurry is improved when the solid content of the precursor slurry is improved. The method is capable of improving the preparation efficiency of the precursor, and also guaranteeing the performances of lithium iron phosphate.

Description

technical field [0001] The invention belongs to the technical field of energy materials, and relates to a lithium ion battery cathode material, in particular to a preparation method of a lithium iron phosphate cathode material. Background technique [0002] Lithium-ion batteries have the characteristics of light weight, high energy density, high working voltage, long cycle life, and environmental protection. Research on lithium-ion batteries has become the focus of attention, and new battery cathode materials have become the key to improving the performance of lithium-ion batteries. Lithium-ion batteries with lithium iron phosphate as the cathode material have the above advantages. [0003] At present, the preparation method of lithium iron phosphate generally adopts a high-temperature solid-phase method, and spray drying is required to spray and granulate the slurry after ball milling. On the one hand, the lithium source, iron source, and phosphorus source are mixed evenly...

Claims

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Application Information

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IPC IPC(8): H01M4/1397H01M4/58H01M4/62
CPCC01B25/45H01M4/1397H01M4/5825H01M4/62Y02E60/10
Inventor 郑保平方蕾蕾
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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