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Preparation method and application of lithium iron phosphate-carbon fiber composite cathode material

A lithium iron phosphate and composite cathode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, structural parts, etc., can solve the problems of limiting the performance of electrode materials and difficult to provide porous structures

Inactive Publication Date: 2013-10-23
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanonization and surface carbon coating are usually difficult to provide the desired porous structure, which limits the performance of electrode materials to some extent.

Method used

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  • Preparation method and application of lithium iron phosphate-carbon fiber composite cathode material
  • Preparation method and application of lithium iron phosphate-carbon fiber composite cathode material
  • Preparation method and application of lithium iron phosphate-carbon fiber composite cathode material

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preparation example Construction

[0024] see figure 1 , showing the process flow of the preparation method of the lithium iron phosphate-carbon fiber composite cathode material of the embodiment of the present invention, including the following steps:

[0025] S01: Obtain lithium source compound, ferrous iron source compound and phosphorus source compound respectively according to the stoichiometric ratio of lithium iron phosphate to be prepared, and add a liquid dispersant;

[0026] S02: The raw materials obtained by ball milling and drying;

[0027] S03: placing the dried product in a reaction chamber, and introducing a protective gas into the reaction chamber;

[0028] S04: Heating the reaction chamber to 300-900°C, introducing carbon source gas, and pyrolyzing the carbon source gas at a temperature of 300-900°C to prepare lithium iron phosphate-carbon fiber composite cathode material.

[0029] In step S01, the lithium source compound is lithium carbonate, lithium hydroxide, lithium oxalate or lithium lac...

Embodiment 1

[0038] The preparation method of the present embodiment 1 comprises the following specific steps:

[0039] (1) Weigh lithium hydroxide, ferrous oxalate and ammonium hydrogen phosphate respectively according to the molar ratio of Li:Fe(Ⅱ):P=1.2:1:1, add 25wt% sucrose (calculated according to the formation of lithium iron phosphate) and acetone ,

[0040] (2) Use agate balls for high-speed ball milling for 6 hours. During ball milling, the mass ratio of each material is: raw material: dispersant: ball = 1:3:6, forming a powder;

[0041] (3) at 60 , Vacuum drying step (1) After 24 hours, the ground powder is placed in a reaction furnace under atmosphere protection;

[0042] (4) After vacuuming, nitrogen is introduced to an atmospheric pressure;

[0043] (5) First raise the temperature to 350°C, keep it warm for 5 hours and then raise the temperature to 500°C;

[0044] (6) Feed neopentane into the reaction chamber, adjust the neopentane flow rate to 100 sccm, and keep warm fo...

Embodiment 2

[0048] The preparation method of present embodiment 2 comprises following specific steps:

[0049] (1) Weigh lithium oxalate, ferrous acetate and ammonium dihydrogen phosphate according to the molar ratio of Li:Fe(Ⅱ):P=1.0:1:1, add 40wt% glucose (calculated based on the formation of lithium iron phosphate) and ethanol ,

[0050] (2) Use agate balls for high-speed ball milling for 4 hours. During ball milling, the mass ratio of each material is: raw material: dispersant: ball = 1:2:6, forming a powder;

[0051] (3) at 80 , Vacuum drying step (1) After grinding the powder for 12 hours, place it in a reaction furnace under atmosphere protection;

[0052] (4) After vacuuming, inject helium to an atmospheric pressure;

[0053] (5) First raise the temperature to 400°C, keep it warm for 4 hours and then raise the temperature to 600°C;

[0054] (6) Feed methane into the reaction chamber, adjust the methane flow rate to 150 sccm, and keep warm for 36 hours;

[0055] (7) Turn off ...

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Abstract

The invention provides a preparation method of a lithium iron phosphate-carbon fiber composite cathode material, which comprises the following steps: respectively acquiring a lithium source compound, a ferrous iron source compound and a phosphorus source compound according to the stoichiometric ratio of the lithium iron phosphate to be prepared, and adding a liquid dispersant; ball milling the acquired raw materials and drying; putting the dried products into a reaction chamber and introducing protective gas into the reaction chamber; and heating the reaction chamber to 300-900 DEG C, introducing carbon source gas, and pyrolyzing the carbon source gas at the temperature of 300-900 DEG C to prepare the lithium iron phosphate-carbon fiber composite cathode material. The invention also provides the lithium iron phosphate-carbon fiber composite cathode material prepared by the method. By the preparation method, carbon fibers are grown in situ from gas phase by pyrolyzing the organic carbon source and compounded with the lithium iron phosphate, thereby improving the dispersion degree of the carbon fibers in the lithium iron phosphate, and being widely applied in the fields of lithium ion batteries and the like.

Description

technical field [0001] The invention relates to a preparation method of an electrode material, in particular to a microwave preparation method and application of a lithium iron phosphate-carbon fiber composite cathode material. Background technique [0002] At present, carbon materials have attracted people's attention because they can be widely used in various fields, and have been widely used and studied. For example, carbon nanotube materials and carbon fiber materials are still popular materials for current research and development. A wide application of carbon materials is as an electrode material, for example, the earliest graphite, which is still used as a negative electrode material in many batteries. With the current research and development of carbon nanotube materials and carbon fiber materials, their application in electrode materials is becoming more and more mature. At present, most lithium-ion batteries use carbon materials as electrode materials. [0003] L...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/13
CPCY02E60/122Y02E60/10
Inventor 曾燮榕邓飞邹继兆黎晓华
Owner SHENZHEN UNIV