Polyanion lithium ferrous phosphate positive material of lithium battery and preparation method thereof

A technology of lithium ferrous phosphate and polyanion, applied in battery electrodes, phosphates, phosphorus oxyacids, etc., can solve the problems of low conductivity and low lithium ion mobility, achieve sufficient reaction, improve diffusivity, improve Effect of Ion Mobility Coefficient

Active Publication Date: 2013-03-27
DONGFANG ELECTRIC CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems in the prior art that lithium ions are not provided with multi-dimensional transmission channels, resulting in low electrical conductivity and low mobility of lithium ions, and provides a lithium battery polyanion lithium ferrous phosphate positive electrode material, the ferrous phosphate The lithium cathode material has a polyanion structure, which provides a three-dimensional channel for the migration of lithium ions and improves the structural stability of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A lithium battery polyanion lithium ferrous phosphate positive electrode material, characterized in that: the lithium battery polyanion lithium ferrous phosphate positive electrode material contains PO 4 3- f - Polyanionic, the chemical formula is Li 2 FePO 4 F lithium battery cathode material.

Embodiment 2

[0031] A method for preparing a lithium battery polyanion lithium iron phosphate positive electrode material, comprising the following process steps:

[0032] A. Mole ratio Li:F:Fe:PO 4 =1:1:1:1 ratio to weigh lithium-containing compound, fluorine-containing compound and FePO 4 The powder is placed in a polytetrafluoroethylene ball mill tank for ball milling to obtain a mixed powder;

[0033] B. Put the mixed powder obtained in step A in a high-temperature furnace at 500°C for 60 minutes under the protection of an inert gas to obtain LiFePO 4 F;

[0034] C. Molar ratio Li:LiFePO 4 The ratio of F:C=1:1:0.25 weighs the lithium-containing compound, LiFePO 4 F. The carbon-containing compound powder is placed in a polytetrafluoroethylene ball mill tank for ball milling, and the fully mixed powder is put into a tableting mold, and the powder is compacted with a hydraulic press to obtain a compacted powder;

[0035] D. The compacted powder obtained in step C is placed in a 600°...

Embodiment 3

[0037] A method for preparing a lithium battery polyanion lithium iron phosphate positive electrode material, comprising the following process steps:

[0038] A. Mole ratio Li:F:Fe:PO 4 =1:1:1:1 ratio to weigh lithium-containing compound, fluorine-containing compound and FePO 4 The powder is placed in a polytetrafluoroethylene ball mill tank for ball milling to obtain a mixed powder;

[0039] B. Put the mixed powder obtained in step A in a high-temperature furnace at 650°C for 120 minutes under the protection of an inert gas to obtain LiFePO 4 F;

[0040] C. Molar ratio Li:LiFePO 4F:C=1:1:1 ratio weighs lithium-containing compound, LiFePO 4 F, the carbon-containing compound powder is placed in a polytetrafluoroethylene ball mill tank for ball milling, the fully mixed powder is put into a tableting mold, and the powder is compacted with a hydraulic press to obtain a compacted powder;

[0041] D. The compacted powder obtained in step C is placed in an 850°C high-temperatur...

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Abstract

The invention relates to a polyanion lithium ferrous phosphate positive material of a lithium battery and a preparation method thereof, and belongs to a technology of the positive material of a lithium ion battery. A proper number of lithium ions and fluorine ions are added in a lithium ferrous phosphate material so as to form a composite polyanion compound together with lithium ferrous phosphate, and a three-dimensional lithium ion diffusion path is supplied based on an olivine material structure, and thus the diffusion rate of the lithium ions can be effectively increased and the electrochemical performance of the material is improved.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material and a preparation method thereof. Specifically, the invention relates to a lithium battery polyanion lithium ferrous phosphate positive electrode material and a preparation method thereof, belonging to the lithium ion battery positive electrode material technology. Background technique [0002] With the development of human society, the human demand for energy is increasing, and the energy storage method can make full use of the earth's resources. As an important branch of energy storage, chemical power sources have occupied an important position in human daily life. With the development of science and technology, human beings put forward higher and more requirements for battery materials. Battery materials with high capacity density, high power density, environmental friendliness, low cost and long service life are the focus of industry research. [0003] In 1990, Sony Corporat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58C01B25/26
CPCY02E60/12Y02E60/10
Inventor 梁孜李明科李玉龙朱睿
Owner DONGFANG ELECTRIC CORP LTD
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