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Cathode material ferric phosphate doped with metallic ions for lithium ion battery and preparation method thereof

A lithium-ion battery, metal ion technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as restricting material application, poor electronic conductivity and ionic conductivity of iron phosphate

Inactive Publication Date: 2010-09-22
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the research of iron phosphate, the positive electrode material of lithium-ion batteries, it was found that iron phosphate has poor electronic conductivity and ion conductivity, which seriously restricts the application of this material.

Method used

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  • Cathode material ferric phosphate doped with metallic ions for lithium ion battery and preparation method thereof
  • Cathode material ferric phosphate doped with metallic ions for lithium ion battery and preparation method thereof
  • Cathode material ferric phosphate doped with metallic ions for lithium ion battery and preparation method thereof

Examples

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Effect test

preparation example Construction

[0041] Doped FePO 4 Electrode and battery preparation method, the steps are as follows:

[0042](1) Preparation of iron phosphate electrode: Doped iron phosphate is used as the positive electrode material, and electronically conductive materials (such as graphite, carbon black, acetylene black, metal powder or other conductive polymer materials, etc.) need to be added to the positive electrode sheet. ) and binders (such as polyvinylidene fluoride, polytetrafluoroethylene, cellulose, water-soluble rubber, etc.). The ratio of each component is calculated by mass: iron phosphate: electronically conductive material: binder = 70-80: 10-20: 5-10; the negative electrode adopts metal lithium sheet.

[0043] (2), battery assembly: electrolytic solution adopts ethylene carbonate: methyl ethyl carbonate: diethyl carbonate=1: 1: 1 (wt%) as solvent, with 1mol / L lithium hexafluorophosphorus ( LiPF 6 ) is the electrolyte solution of the electrolyte.

[0044] The iron phosphate pole piece...

example 1

[0050] Pure FePO 4 prepared by the co-precipitation method

[0051] Fe(NO 3 ) 3 9H 2 O, NH 4 h 2 PO 4 , the above-mentioned substances were dissolved in water and mixed, mechanically stirred, adjusted to pH 2.5, heated to 90°C, reacted for 10 hours, aged, filtered, washed, and dried to obtain the precursor. The precursor is sintered in the air at 380° C. for 10 hours, then pulverized by a ball mill and sieved to obtain a positive electrode material for a lithium ion battery—iron phosphate material not doped with metal ions. The material was used as the positive electrode and the lithium sheet was used as the negative electrode to assemble a battery for charging and discharging tests. figure 1 FePO undoped with metal ions 4 Battery charge and discharge curve.

example 2

[0053] Take Al 3+ Ion doping, using solid-phase synthesis

[0054] Fe was weighed at the ratio of Fe:Al:P molar ratio 0.96:0.04:1 2 (CO 3 ) 3 , Al(NO 3 ) 3 9H 2 O and (NH 4 ) 2 HPO 4 After mixing the above-mentioned substances, ball milling is carried out with ethanol as the medium for 12 hours, and then the mixture is sintered in the air at 380° C. for 10 hours, and then pulverized by ball milling to obtain a lithium ion battery cathode material - doped with Al 3+ Ionic ferric phosphate synthetic material.

[0055] The composite material was used as the positive electrode and the lithium sheet was used as the negative electrode to assemble a battery for electrochemical tests and charge-discharge tests. figure 2 For the battery charge and discharge curve, from figure 2 It can be seen in Al 3+ After ion doping, compared to figure 1 For the undoped iron phosphate material, the capacity of the iron phosphate material increases from 73mAh / g to 93mAh / g. Descriptio...

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Abstract

The invention discloses a cathode material ferric phosphate doped with metallic ions for a lithium ion battery and a preparation method thereof. The ferric phosphate doped with the metallic ions consists of a Fe source, a P source and the doped metallic ions, wherein a mol ratio of the Fe source to the doped metallic ions to the P source is 0.92-0.99: 0.01-0.08: 1. A wet synthesis method or a solid-phase synthesis method is adopted to prepare the cathode material ferric phosphate doped with the metallic ions for the lithium ion battery by doping the metallic ions. The doping of the ions is proved to play a positive role in the electrochemical properties of the ferric phosphate material in a way that the capacity of the ferric phosphate material doped with the metallic ions is improved by 10 to 50 percent than that of the ferric phosphate material not doped with the metallic ions. Through the doping of the ions, the electronic conductivity of the material is improved; and simultaneously, due to differences in radiuses of the coped ions, crystal structures of the ferric phosphate are changed, which is favorable for the migration and diffusion of lithium ions.

Description

technical field [0001] The present invention relates to the material of chemical power supply, more specifically relates to lithium ion battery cathode material-iron phosphate doped with metal ions and its preparation method. Background technique [0002] Energy is an important material basis for human survival and social development, and an important cornerstone for national economy, national security and sustainable development. At present, green and non-polluting new high-energy chemical power sources have become a hot spot in the development of countries all over the world. Theory and practice have proved that lithium-ion batteries have incomparable advantages over other secondary batteries. The advantages of lithium-ion batteries can basically be summarized as follows: high working voltage (three times that of nickel-metal hydride batteries); large specific energy (up to 180Wh / kg, which is 3 times that of nickel-hydrogen batteries); small size; light weight; long cycl...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397
Inventor 张俊喜许明玉任平华思昊梅颖顾志浩李春秋
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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