High-power lithium iron phosphate positive pole material and manufacturing method thereof

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, circuits, etc., can solve the problems of irregular material morphology, achieve the effect of improving rate performance, increasing the degree of graphitization, and increasing output power

Active Publication Date: 2013-08-14
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its carbon layer stone blackening is SP 2 / SP 3 The ratio is high, and the prepared lithium iron phosphate material has high electronic conductivity, which can greatly improve the high-rate discharge performance of the material, but the morphology of the material produced by this process is not regular.

Method used

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  • High-power lithium iron phosphate positive pole material and manufacturing method thereof
  • High-power lithium iron phosphate positive pole material and manufacturing method thereof
  • High-power lithium iron phosphate positive pole material and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Select battery-grade raw material Li 2 CO 3 , FeC 2 o 4 2H 2 O, NH 4 h 2 PO 4 , the molar ratio is according to Li:Fe:P=1.03:1:1, and all the weighed materials are added to the basket grinder filled with ethanol, the grinding time is 2h, and the temperature of the ground slurry is 90°C Dry for 4 hours, because it will agglomerate after drying, so break it with a crusher and put it in a crucible. Using nitrogen as a protective gas, put it into a tube furnace at 650 ° C for 7 hours to obtain uncoated LiFePO 4 sample.

[0025] 2) Take 158g uncoated LiFePO 4 For the sample, use anhydrous ethanol as a solvent, add 10g of fructose and 2.25g of ferrocene alcohol solution, grind, wait for complete drying (60°C, 3 hours treatment), and crush with a universal crusher.

[0026] 3) Using Ar gas as a protective gas, the temperature was raised to 650 degrees, and the above mixture was kept at a constant temperature in a tube furnace for 10 hours, and then sintered to obt...

Embodiment 2

[0032] 1) Select battery grade raw materials LiOH, Fe 2 o 3 , (NH 4 ) 2 HPO 4 , the molar ratio is according to Li:Fe:P=1.2:1:1, and all the weighed materials are added to the basket mill filled with deionized water. The grinding time is 2h, and the ground slurry is placed at a temperature of Dry it at 150°C for 1 hour, crush it with a crusher, and put it in a crucible. Using argon as a protective gas, put it into a tube furnace for 5 hours at 750 ° C to pre-fire to obtain uncoated LiFePO 4 sample.

[0033] 2) Take 317g uncoated LiFePO 4 For the sample, use anhydrous ethanol as a solvent, add 21g rock sugar and 6.34g cobalt dicene in acetone solution, grind, wait for complete drying (100°C, 1 hour treatment), and crush it with a universal crusher.

[0034] 3) Using nitrogen as the protective gas, the temperature was raised to 600 degrees, and the above mixture was kept at a constant temperature in a tube furnace for 10 hours, and then sintered to obtain LiFePO 4 / C com...

Embodiment 3

[0036] 1) Select battery-grade raw material LiCH 3 COO, Fe(CH 3 COO) 2 、H 3 PO 4 , the molar ratio is according to Li:Fe:P=1:1:1.05, and all the weighed materials are added to the basket grinder filled with acetone, the grinding time is 2h, and the temperature of the ground slurry is 110°C Dry it for 5 hours, crush it with a crusher, and put it in a crucible. Using nitrogen as a protective gas, put it into a tube furnace at 500 ° C for 10 hours to obtain uncoated LiFePO 4 sample.

[0037] 2) Take 1581g uncoated LiFePO 4 For the sample, use anhydrous ethanol as a solvent, add 102g of citric acid and 23g of titanocene alcohol solution, grind, wait for complete drying (140°C, 2.5 hours treatment), and crush with a universal crusher.

[0038] 3) Using argon as the protective gas, the temperature rises to 750 degrees, and the above mixture is kept at a constant temperature in a tube furnace for 5 hours, and then sintered to obtain LiFePO 4 / C composite cathode material.

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Abstract

The invention discloses a high-power lithium iron phosphate positive pole material and a manufacturing method thereof. The method comprises the following steps of: fully mixing a lithium source, an iron source and a phosphorus source according to a mole ratio of Li to Fe to P being (1-1.2):1: (1-1.05), sintering under an inert atmosphere to prepare a lithium iron phosphate precursor, introducing a catalyst and a carbon source, and optimizing a sintering process and the reaction atmosphere to prepare the LiFePO4 / C composite positive material with high degree of graphitization and a carbon coating layer. The lithium iron phosphate positive pole material prepared by the invention has uniform grains, and is good in monodispersity, high in conductivity, excellent in electrical performance, simple in preparation method, economic and is easy to realize industrial production.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a carbon-coated lithium-ion battery cathode material with excellent power performance and a preparation method thereof. Background technique [0002] Due to its excellent safety and cycle life, lithium iron phosphate batteries will dominate the future power battery market. However, the poor electronic conductivity of lithium iron phosphate (~10 -9 S / cm) and ion conductivity, so that the performance of lithium iron phosphate is only 30%-40% of the theoretical capacity. In order to improve the electrical performance of lithium iron phosphate, especially the power performance, many research works have carried out various modification methods to overcome this shortcoming. [0003] According to a large number of existing studies, the carbon coating method has a good effect on LiFePO 4 / C performance has a big impact. There are two commonly used coating methods: one is in-situ c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/1397H01M4/133H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 唐春霞周恒辉张卫东黄长靓岳艳花王丹
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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