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Lithium iron phosphate composite material and preparation method and application thereof

A lithium iron phosphate and composite material technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problem of low low-temperature conductivity of lithium iron phosphate cathode materials, limiting the electrical properties of lithium iron phosphate cathode materials, and changes in the conductivity of lithium iron phosphate. It can improve the problem of poor low temperature discharge performance, good ionic and electronic conductivity, and improve electronic conductivity.

Pending Publication Date: 2022-01-28
陕西创普斯新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the theoretical capacity, discharge platform voltage, electron and ion conductivity of lithium iron silicate are lower than those of lithium iron phosphate, so the doping of lithium iron silicate will lead to poor conductivity of lithium iron phosphate after rechecking, followed by solid phase The inherent defects of the method further limit the electrical performance of lithium iron phosphate cathode materials.
[0006] None of the existing technologies can well solve the problem of low-temperature electrical conductivity of lithium iron phosphate cathode materials

Method used

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  • Lithium iron phosphate composite material and preparation method and application thereof
  • Lithium iron phosphate composite material and preparation method and application thereof
  • Lithium iron phosphate composite material and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0086] 1. Precursor synthesis stage: carbon-coated LiFePO4 cathode material was prepared by sol-gel method

[0087] According to LiOH, H 3 BO 3 、FePO 4 The molar ratio with citric acid is 0.97:0.03:0.97:3, lithium source, boron source, iron source, phosphorus source are mixed in deionized water (the consumption of deionized water is 3 times of all raw material quality), then add Citric acid and Polyethylene Glycol (Polyethylene Glycol consumption is 1 / 10 of all raw material gross mass) and the glucose of all raw material gross mass 2.0%, form gel in water-bath pot 60 ℃ of stirring 20h, be cooled to room temperature, obtain viscous Thick precursor gel;

[0088] 2. Dry the obtained precursor gel in a vacuum oven at 70°C for 8 hours, then perform ball milling for 2 hours (ball milling frequency 30Hz, ball-to-material ratio 2:1), and finally put the obtained powder in an inert atmosphere protected Sintering in a tube furnace, specifically: pre-sintering at 300°C for 5 hours, t...

Embodiment 2

[0090] 1. Precursor synthesis stage: Preparation of carbon-coated LiFePO by sol-gel method 4 Cathode material

[0091] According to LiOH, H 3 BO 3 、FePO 4 The molar ratio with citric acid is 0.98:0.05:0.98:3.5, lithium source, boron source, iron source, phosphorus source are mixed in deionized water (the consumption of deionized water is 3 times of all raw material quality), then add Citric acid and polyethylene glycol (the amount of polyethylene glycol is 1 / 10 of the total mass of all raw materials) and 2% glucose of the total mass of all raw materials are stirred in a water bath at 70°C for 15h to form a gel, cooled to room temperature, and viscous Thick precursor gel;

[0092] 2. Dry the obtained precursor gel in a vacuum oven at 75°C for 7 hours, then perform ball milling for 3 hours (ball milling frequency 30Hz, ball-to-material ratio 2:1), and finally put the obtained powder in an inert atmosphere protected Sintering in a tube furnace, specifically: pre-sintering at...

Embodiment 3

[0094] 1. Precursor synthesis stage: Preparation of carbon-coated LiFePO by sol-gel method 4 Cathode material

[0095] According to LiOH, H 3 BO 3 、FePO 4 The molar ratio with citric acid is 1.0:0.05:1.0:4, lithium source, boron source, iron source, phosphorus source are mixed in deionized water (the consumption of deionized water is 3 times of all raw material quality), then add Citric acid and polyethylene glycol (the amount of polyethylene glycol is 1 / 10 of the total mass of all raw materials) and 2% glucose of the total mass of all raw materials are stirred in a water bath at 90 ° C for 10 h to form a gel, cooled to room temperature, and obtained Viscous precursor gel;

[0096] 2. Dry the obtained precursor gel in a vacuum oven at 80°C for 6 hours, then perform ball milling for 4 hours (ball milling frequency 30Hz, ball-to-material ratio 2:1), and finally put the obtained powder in an inert atmosphere protected Sintering in a tube furnace, specifically: pre-sintering ...

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Abstract

The invention discloses a lithium iron phosphate composite material as well as a preparation method and application thereof. The lithium iron phosphate composite material comprises lithium iron phosphate containing an out-phase doping substances, the out-phase doping substance is lithium iron borate; and the lithium iron phosphate is coated with carbon. According to the lithium iron phosphate composite material provided by the invention, the lithium iron phosphate is doped with the lithium iron borate, so that the problem of poor low-temperature discharge performance of a lithium iron phosphate positive electrode material is solved, and meanwhile, the structural stability of the lithium iron phosphate material in the charge-discharge process is not obviously influenced. Compared with a solid phase method, the lithium iron phosphate composite material prepared by adopting a sol-gel method has the characteristics of low energy consumption, good coating property of the synthesized lithium iron phosphate composite material, uniform doping and relatively good particle size and particle size distribution.

Description

technical field [0001] The application relates to a lithium iron phosphate composite material and its preparation method and application, belonging to the technical field of battery materials. Background technique [0002] The performance of a power lithium-ion battery depends largely on the performance of the cathode material. Among the positive electrode materials that have been developed, phosphate-type compounds (Li y m x (PO 4 ) z ) has become the most promising positive electrode material for power lithium-ion batteries due to its good safety and good intercalation / delithiation properties. Among them, LiFePO 4 Materials are the most concerned, and they are also the hotspots of people's research. LiFePO 4 The material has the advantages of rich raw material resources, environmental friendliness, long cycle life, and excellent safety performance, but its inherent low electronic conductivity and lithium ion conductivity make it have low discharge voltage, poor high...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/362H01M4/5825H01M4/624Y02E60/10
Inventor 赵宇飞梁小恵王昊王国冬汪丰
Owner 陕西创普斯新能源科技有限公司
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