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Anion doped high voltage charge and discharge lithium vanadium phosphate cathode material and preparation method thereof

A technology of lithium vanadium phosphate and positive electrode materials, which is applied in the direction of battery electrodes, circuits, electrical components, etc., to achieve the effect of reducing electrical conductivity, reducing contact resistance, and succinct process

Inactive Publication Date: 2018-09-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the research on the doping modification of lithium iron phosphate, most of them use metal ions, and there are few studies on doping modification using anions.

Method used

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  • Anion doped high voltage charge and discharge lithium vanadium phosphate cathode material and preparation method thereof
  • Anion doped high voltage charge and discharge lithium vanadium phosphate cathode material and preparation method thereof
  • Anion doped high voltage charge and discharge lithium vanadium phosphate cathode material and preparation method thereof

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Embodiment 1

[0023] A preparation method of anion-doped high-voltage charge-discharge lithium vanadium phosphate positive electrode material, the lithium vanadium phosphate positive electrode material is Li 3 V 2 (PO 4 ) 3-x Br x , where 0.04≤x≤0.16, including the following steps:

[0024] 1) will Li 3 C 6 h 6 o 7 , V 2 o 5 、H 3 PO 4 1. Add HBr into deionized water and stir for 5 minutes; slowly add a saturated aqueous solution of oxalic acid to the solution, and continue stirring for 5 minutes, the solution turns orange; use ammonia water to adjust the pH of the solution to PH7, and the solution turns light green at this time;

[0025] 2) Directly heat in a water bath at a heating temperature of 60°C with constant stirring, keep warm for 3 hours to evaporate excess water, and the solution gradually turns into a dark blue sol; put the obtained sol in an oven at 70°C, dry for 10 hours, and evaporate to dryness to obtain a precursor body;

[0026] 3) Put the above-mentioned prod...

Embodiment 2

[0050] A preparation method of anion-doped high-voltage charge-discharge lithium vanadium phosphate positive electrode material, the lithium vanadium phosphate positive electrode material is Li 3 V 2 (PO 4 ) 3-x Br x , where 0.04≤x≤0.16, 1) the Li 3 C 6 h 6 o 7 , V 2 o 5 、H 3 PO 4 1. Add HBr into deionized water and stir for 5 minutes; slowly add a saturated aqueous solution of oxalic acid to the solution, and continue stirring for 5 minutes, the solution turns orange; use ammonia water to adjust the pH of the solution to PH7, and the solution turns light green at this time;

[0051] 2) Directly heat in a water bath at a heating temperature of 50°C with constant stirring, keep warm for 3 hours to evaporate excess water, and the solution gradually turns into a dark blue sol; put the obtained sol in an oven at 70°C, dry for 10 hours and evaporate to dryness to obtain a precursor body;

[0052] 3) Put the above-mentioned obtained product into a tube furnace for pre-ca...

Embodiment 3

[0056] A preparation method of anion-doped high-voltage charge-discharge lithium vanadium phosphate positive electrode material, the lithium vanadium phosphate positive electrode material is Li 3 V 2 (PO 4 ) 3-x Br x , where 0.04≤x≤0.16, 1) the Li 3 C 6 h 6 o 7 , V 2 o 5 、H 3 PO 4 1. Add HBr into deionized water and stir for 5 minutes; slowly add a saturated aqueous solution of oxalic acid to the solution, and continue stirring for 5 minutes, the solution turns orange; use ammonia water to adjust the pH of the solution to PH7, and the solution turns light green at this time;

[0057] 2) Directly heat in a water bath at a heating temperature of 65°C with constant stirring, keep warm for 3 hours to evaporate excess water, and the solution gradually turns into a dark blue sol; put the obtained sol in an oven at 80°C, dry for 10 hours and evaporate to dryness to obtain a precursor body;

[0058] 3) Put the above-mentioned product into a tube furnace for pre-calcination...

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Abstract

The invention provides an anion doped high voltage charge and discharge lithium vanadium phosphate cathode material and a preparation method thereof. The preparation method comprises the following steps: putting raw materials into a reaction vessel, adding water and stirring until all the raw materials are fully dissolved, and regulating pH value of the solution with ammonia water; heating in water bath directly, drying excessive moisture by distillation and forming a sol-like substance, and drying; then putting into a tube furnace, pre-sintering for 1-4 hours, and removing impurities; and grinding and tabletting the product, and then calcining for 4-12 hours, and naturally cooling to room temperature, thus the cathode material is obtained. The preparation method is succinct in steps and easy to operate, experimental conditions are simple and controllable, requirements on experimental apparatus are low, and the obtained bromine-doped lithium vanadium phosphate cathode material has better multiplying power and cycle performance during high voltage charge and discharge and has a broader application prospect in the aspect of power batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery materials and preparation methods thereof, in particular to a doped high-voltage charge-discharge lithium vanadium phosphate cathode material and a preparation method thereof. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high voltage, high capacity, and environmental friendliness. Its main components include positive electrodes, negative electrodes, electrolytes, separators, and casings. The slow development of positive electrode materials is the main obstacle restricting the development of lithium-ion secondary batteries. Monoclinic lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ), because of its good thermal stability, high specific capacity, and wide operating temperature range, it has the potential to become the second-generation phosphate polyanion lithium-ion secondary battery cathode material after lithium iron phosphate. [0003] The elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/0525
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 吴孟强刘飞徐自强蒋微微冯婷婷
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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