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Nanometer lithium iron phosphate as well as preparation method and application thereof

A lithium iron phosphate, nano technology, applied in the field of nano lithium iron phosphate, and its preparation field, achieves the effect of wide application prospect, excellent rate performance and excellent cycle stability

Active Publication Date: 2013-04-17
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many studies on the hydrothermal method. The hydrothermal reaction is simple to operate, uniform in phase, uniform in particle size, and good in crystallinity. The low-rate performance of the prepared nano-sized lithium iron phosphate has been improved to a certain extent, but the high-rate performance needs to be further improved. improvement and enhancement

Method used

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  • Nanometer lithium iron phosphate as well as preparation method and application thereof
  • Nanometer lithium iron phosphate as well as preparation method and application thereof
  • Nanometer lithium iron phosphate as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 : Preparation of nano-lithium iron phosphate

[0052] Weigh 1 g of alginic acid and dissolve it in 100 ml of water / glycerol mixed solvent (glycerol volume fraction 50%), and stir evenly to obtain an alginic acid solution with a concentration of 10 mg / ml.

[0053] Add 1.2717g lithium chloride (LiCl), 1.1998g sodium dihydrogen phosphate (NaH 2 PO 4 ), 4.0402g ferric nitrate (Fe(NO 3 ) 3 9H 2 O), and the mixture was obtained after stirring evenly. That is, the molar ratio of lithium source: phosphorus source: iron source is 3:1:1. The molar ratio of alginic acid to iron source is 0.25:1.

[0054] Put the mixed solution into a high-pressure reactor, react at 150°C for 12 hours, centrifuge the product, wash it with water and ethanol three times, and dry it in vacuum to obtain lithium iron phosphate powder. The dried powder was calcined at a rate of 10°C / min to 700°C for 2.5 hours under a nitrogen atmosphere to obtain nanometer lithium iron phosphate.

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Embodiment 2

[0057] Example 2 : Preparation of nano-lithium iron phosphate

[0058] Similar to Example 1, the difference is that 4g of alginic acid was weighed and dissolved in 100ml of water / glycerol mixed solvent (glycerol volume fraction 50%), and stirred evenly to obtain an alginic acid solution with a concentration of 40mg / ml. Keep the concentration of iron source constant, and the molar ratio of alginic acid to iron source is 1:1.

Embodiment 3

[0059] Example 3 : Preparation of nano-lithium iron phosphate

[0060] Weigh 2g of alginic acid and dissolve it in 100ml of water / diethylene glycol mixed solvent (the volume fraction of diethylene glycol is 50%), and stir evenly to obtain an alginic acid solution with a concentration of 20mg / ml.

[0061] Add 3.9594g lithium acetate (CH 3 COOLi), 2.3006g ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), 5.406g ferric chloride (FeCl 3 ·6H 2 O), and the mixture was obtained after stirring evenly. That is, the molar ratio of lithium source: phosphorus source: iron source is 3:1:1. The molar ratio of alginic acid to iron source is 0.25:1.

[0062] Put the mixed solution in a high-pressure reaction kettle, react at 180°C for 10 hours, centrifuge the product, wash it with water and ethanol three times, and dry it in vacuum to obtain lithium iron phosphate powder. The dried powder was calcined at a rate of 1°C / min to 500°C for 1 hour under a nitrogen atmosphere to obtain nanom...

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Abstract

The invention relates to a preparation method for nanometer lithium iron phosphate-an anode active material, obtained a product and an application of the nanometer lithium iron phosphate to a lithium ion battery. An application of alginic acid is combined with a hydrothermal reaction, wherein the alginic acid not only can be used as a carbon-coated carbon source but also can be used for limiting the particle size of particles; and the simple operation of combining the hydrothermal reaction is environment-friendly, and nanometer lithium iron phosphate with adjustable particle size of 50-300 nm can be prepared. The nanometer lithium iron phosphate is used as the anode active material of the lithium ion battery, so that the high-rate performance of the lithium ion battery is remarkably improved and the good circulating stability is obtained.

Description

【Technical field】 [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to nanometer lithium iron phosphate, its preparation method and application. 【Background technique】 [0002] Since the Goodenough group first reported that lithium iron phosphate can be used as a cathode material for lithium-ion batteries, lithium iron phosphate has become an ideal material due to its low cost, environmental friendliness, high specific capacity, long cycle life, high temperature performance and good safety performance. Lithium-ion secondary power battery cathode material. However, the low electronic conductivity and lithium ion diffusion rate of lithium iron phosphate greatly limit its electrochemical performance, resulting in poor initial charge and discharge efficiency and rate performance, which seriously restricts its large-scale application in power lithium-ion batteries. . [0003] In order to improve the electronic con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58B82Y40/00
CPCY02E60/10
Inventor 朱朋莉周凤瑞孙建政孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI