Magnesium-doped lithium iron phosphate/carbon composite microsphere with high tap density as well as preparation method and application of magnesium-doped lithium iron phosphate/carbon composite microsphere

A technology of tap density and lithium iron phosphate, applied in the direction of electrical components, circuits, battery electrodes, etc., can solve the problems of low electronic conductivity, low tap density, and low ion diffusion rate, and achieve electronic conductivity and ion diffusion High efficiency, high tap density, improved electronic conductivity and ion diffusivity

Pending Publication Date: 2022-04-12
SICHUAN UNIV
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of magnesium-doped lithium iron phosphate / carbon composite microsphere with high tap density and its preparation method and application, solve the problems of low tap density, low electronic conductivity and low electronic conductivity of lithium iron phosphate materials in the prior art. The problem of low ion diffusivity

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  • Magnesium-doped lithium iron phosphate/carbon composite microsphere with high tap density as well as preparation method and application of magnesium-doped lithium iron phosphate/carbon composite microsphere
  • Magnesium-doped lithium iron phosphate/carbon composite microsphere with high tap density as well as preparation method and application of magnesium-doped lithium iron phosphate/carbon composite microsphere
  • Magnesium-doped lithium iron phosphate/carbon composite microsphere with high tap density as well as preparation method and application of magnesium-doped lithium iron phosphate/carbon composite microsphere

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preparation example Construction

[0030] An embodiment of the present invention provides a method for preparing magnesium-doped lithium iron phosphate / carbon composite microspheres with high tap density, comprising the following steps:

[0031] (1) Weigh an appropriate amount of iron source, phosphorus source, lithium source, magnesium hydroxide, PEG-400, carbon source A and mix in solid phase to obtain a mixture, then add the mixture to deionized water containing zircon sand for ball milling, after ball milling Use a sieve to filter and separate the zircon sand to obtain a slurry; wherein, the molar ratio of iron, phosphorus, lithium and magnesium in the mixture is 1:1:1.01:0.01-0.05, and the mass of PEG-400 accounts for the mass of the mixture 2-5% of the mass of the carbon source accounts for 8-16% of the mass of the mixture.

[0032] (2) Spray drying the slurry obtained in step (1) to obtain a yellow-brown precursor powder;

[0033] (3) Place the yellow-brown precursor powder obtained in step (2) in a tub...

Embodiment 1

[0043] A magnesium-doped lithium iron phosphate / carbon composite microsphere with high tap density and a preparation method thereof, comprising the steps of:

[0044] (1) Weigh an appropriate amount of iron phosphate, lithium carbonate, magnesium hydroxide, glucose, and PEG-400 in solid phase to mix to obtain a mixture, then place the mixture in deionized water containing zircon sand for ball milling, and ball mill at a frequency of 50Hz for 30min After the ball milling, the zircon sand is filtered and separated by a sieve to obtain a slurry, wherein the molar ratio of iron, phosphorus, lithium and magnesium in the mixture is 1:1:1.01:0.03, and the mass of PEG-400 is the mixture 2% of the mass, the mass of glucose is 10% of the mass of the mixture, the mass ratio of deionized water to the mixture is 1.5:1, and the mass ratio of zircon sand to the mixture is 12:1.

[0045] (2) Spray drying the slurry obtained in step (1) at a feed rate of 30mL / min, an atomization disc frequency...

Embodiment 2

[0048] A magnesium-doped lithium iron phosphate / carbon composite microsphere with high tap density and a preparation method thereof, comprising the steps of:

[0049] (1) Weigh an appropriate amount of iron phosphate, lithium carbonate, magnesium hydroxide, glucose, and PEG-400 in solid phase to mix to obtain a mixture, then place the mixture in deionized water containing zircon sand for ball milling, and ball mill at a frequency of 50Hz for 30min After ball milling, the zircon sand is filtered and separated with a sieve to obtain a slurry, wherein the molar ratio of iron, phosphorus, lithium and magnesium in the mixture is 1:1:1.01:0.01, and the mass of PEG-400 is the mixture 2% of the mass, the mass of glucose is 10% of the mass of the mixture, the mass ratio of deionized water to the mixture is 1.5:1, and the mass ratio of zircon sand to the mixture is 12:1.

[0050] (2) Spray drying the slurry obtained in step (1) at a feed rate of 30mL / min, an atomization disc frequency o...

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Abstract

The invention discloses magnesium-doped lithium iron phosphate / carbon composite microspheres with high tap density and a preparation method and application thereof, and belongs to the technical field of lithium batteries, and the preparation method comprises the following preparation steps: (1) weighing a proper amount of an iron source, a phosphorus source, a lithium source, magnesium hydroxide, PEG-400 and a carbon source A, and performing solid-phase mixing to obtain a mixture, adding the mixture into deionized water containing zircon sand for ball milling, and filtering and separating the zircon sand by using a screen after ball milling to obtain slurry; (2) carrying out spray drying treatment on the slurry obtained in the step (1) to obtain yellowish-brown precursor powder; and (3) placing the yellowish-brown precursor powder obtained in the step (2) in a tubular furnace rich in inert gas for high-temperature sintering to obtain the high-tap-density magnesium-doped lithium iron phosphate / carbon composite microballoon.The composite material obtained by the preparation method has the advantages of high electronic conductivity and ion diffusivity, good rate capability and cycle performance, high tap density, high specific surface area, high specific surface area and the like. The material can be used for producing middle-large capacity and middle-high power lithium ion batteries, and industrialization of the material can be promoted.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a magnesium-doped lithium iron phosphate / carbon composite microsphere with high tap density and a preparation method and application thereof. Background technique [0002] Under the international background of resource scarcity and energy saving and emission reduction, lithium-ion batteries are internationally recognized as ideal energy storage and output power sources due to their high volume energy density, mass energy density and excellent cycle performance, and are increasingly used in various fields. showed an important role. As an important part of the lithium-ion battery, the performance of the cathode material of the lithium-ion battery directly affects the various performance indicators of the lithium-ion battery, occupying the core position of the lithium-ion battery. At present, there are many kinds of cathode materials for lithium-ion batteries ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62
Inventor 武开鹏张云鄢传民吴昊王倩
Owner SICHUAN UNIV
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