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Preparation method of lithium ion battery positive pole material LiFePO4/C

A technology for lithium ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as crystallinity, morphology and particle size that cannot be balanced, and achieve excellent electrochemical performance, low reaction temperature, and reaction. short time effect

Active Publication Date: 2014-09-10
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is: for current LiFePO 4 In the preparation process, the problem of crystallinity, morphology and particle size cannot be taken into account, and a method for the preparation of completely crystallized, sheet-like morphology, nanoscale LiFePO 4 A method to improve the lithium-ion battery cathode material LiFePO 4 electrochemical performance

Method used

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  • Preparation method of lithium ion battery positive pole material LiFePO4/C
  • Preparation method of lithium ion battery positive pole material LiFePO4/C
  • Preparation method of lithium ion battery positive pole material LiFePO4/C

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Embodiment 1

[0044] Weigh FeSO at a molar ratio of 1:1:1 4 ·5H 2 O, H 3 PO 4 and LiOH·H 2 O. FeSO 4 ·5H 2 O and H 3 PO 4 Dissolved in ionized water, under the condition of continuously feeding argon into the above solution, add LiOH to the above solution to obtain a reaction precursor (the concentration of lithium ions is 2mol L -1 ), at this time, the pH of the reaction system is 5.0. Under the condition of continuously feeding argon into the reaction precursor, transfer it into a hydrothermal reaction kettle, and pass argon into the kettle to remove the air in the kettle. The reactor was placed in a blast drying oven, and after reacting at 190°C for 6 hours, it was taken out from the blast drying oven and cooled to 40°C. After the kettle was cooled, the reaction product was taken out and washed three times with deionized water. Finally, vacuum drying at 50°C for 12 hours to obtain LiFePO 4 powder. A certain amount of sucrose was dissolved in deionized water, and then the pre...

Embodiment 2

[0047] Weigh FeCl at a molar ratio of 1:1:4 2 , NH 4 h 2 PO 4 and Li 2 SO 4 . FeCl 2 and NH 4 h 2 PO 4 Dissolved in deionized water, under the condition of continuously passing argon gas into the above solution, add Li 2 SO 4 Obtain reaction precursor (the concentration of lithium ion is 9mol L -1 ), at this time, the pH of the reaction system is 8.0. Under the condition of continuously feeding argon into the reaction precursor, transfer it into a hydrothermal reaction kettle, and pass argon into the kettle to remove the air in the kettle. The reactor was placed in a blast drying oven, and after reacting at 190°C for 6 hours, it was taken out from the blast drying oven and cooled to room temperature. After the kettle was cooled, the reaction product was taken out and washed three times with deionized water. Finally, vacuum drying at 120°C for 1 h to obtain LiFePO 4 powder. A certain amount of glucose was dissolved in deionized water, and then the prepared LiFeP...

Embodiment 3

[0050] Weigh Fe(NO 3 ) 3 9H 2 O, H 3 PO 4 and CH 3 COOLi. Fe(NO 3 ) 3 9H 2 O and H 3 PO 4 Dissolve in deionized water, add CH 3 COOLi obtains the reaction precursor (the concentration of lithium ions is 8mol L -1 ), at this time, the pH of the reaction system is 7.0. Under the condition of continuously feeding nitrogen into the reaction precursor, it was transferred into a hydrothermal reaction kettle, and argon was passed into the kettle to remove the air in the kettle. The reactor was placed in a blast drying oven, and after reacting at 100°C for 10 h, it was taken out from the blast drying oven and cooled to room temperature. After the kettle was cooled, the reaction product was taken out and washed three times with deionized water. Finally, vacuum drying at 60°C for 12 hours to obtain LiFePO 4 powder. A certain amount of acetylene black and the prepared LiFePO 4 Powder ball milling, LiFePO 4 The mass ratio of powder to acetylene black is LiFePO 4 :C=100:...

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Abstract

The invention discloses a preparation method of a lithium ion battery positive pole material LiFePO4 / C. The preparation method comprises the following steps of dissolving or dispersing a ferric salt, a lithium salt and a phosphorus-containing compound in a solvent under the condition of inert gas purging to obtain a reaction precursor, transferring the reaction precursor into a high pressure reactor, carrying out a reaction process for a certain time, carrying out filtration, washing and drying, carrying out mixing with a carbon source, and carrying out calcination treatment to obtain the lithium ion battery positive pole material LiFePO4 / C. The preparation method solves the problem that the traditional preparation method cannot simultaneously realize high crystallization, special morphology and nano-scale particle size. The preparation method can prepare the completely-crystalline flaky nano-scale lithium ion battery positive pole material LiFePO4 / C.

Description

technical field [0001] The present invention relates to the preparation of lithium ion battery positive electrode material, more specifically a kind of lithium ion battery positive electrode material LiFePO 4 / C preparation method. Background technique [0002] Among the existing secondary batteries, lithium-ion batteries have the highest volume energy density and mass energy density. In addition, lithium-ion batteries also have the advantages of long cycle life, no memory effect and low self-discharge rate, and are currently the most advanced. One of the secondary batteries. It has been widely used in various portable electronic products, and has become one of the preferred power sources for electric vehicles and hybrid electric vehicles. [0003] LiFePO 4 Cathode materials have the advantages of high safety, good charge-discharge cycle stability, wide source of raw materials, and environmental friendliness, and are considered to be one of the most promising cathode mate...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCH01M4/5825H01M10/0525Y02E60/10
Inventor 陈剑王福庆
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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