Preparation method of hydrothermal synthesis carbon coated lithium iron phosphate

A technology of carbon-coated lithium iron phosphate and hydrothermal synthesis, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of low conductivity and lithium ion diffusion coefficient of lithium iron phosphate, and achieve excellent electrochemical performance and low cost , No environmental pollution effect

Inactive Publication Date: 2013-01-02
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to overcome the problems of low electrical conductivity and lithium ion diffusion coefficient of lithium iron phosphate, the cathode material of lithium ion batteries, and provide a hydrothermally synthesized carbon-coated lithium iron phosphate (LiFePO 4 / C composite) preparation method

Method used

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  • Preparation method of hydrothermal synthesis carbon coated lithium iron phosphate
  • Preparation method of hydrothermal synthesis carbon coated lithium iron phosphate
  • Preparation method of hydrothermal synthesis carbon coated lithium iron phosphate

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Embodiment 1

[0030] A hydrothermally synthesized carbon-coated lithium iron phosphate (LiFePO 4 / C composite) synthetic method, comprising the following steps:

[0031] (1) LiFePO 4 Synthesis of precursors: FeSO was weighed at a molar ratio of 1:1:3 4 .7H 2 O, H 3 PO 4 and LiOH.H 2 O, FeSO 4 .7H 2 O, H 3 PO 4 Dissolve in 50 ml of double distilled water, then add 0.2 g of ascorbic acid to prevent Fe 2+ Oxidized to Fe 3+ , and finally added the dissolved LiOH.H 2 O, quickly transfer the solution to a 500 ml stainless steel reaction kettle, place it in a collector type magnetic heating stirrer, set the temperature to 120°C and stir for 2h. After the reactor was cooled to room temperature, the reaction product was centrifuged, washed with double distilled water and dispersed in alcohol, and then dried in a vacuum oven for 2 hours to obtain a light green powder.

[0032] (2) LiFePO 4 Synthesis of / C precursor: the precursor powder obtained in step (1) and ascorbic acid were mixed ...

Embodiment 2

[0035] A hydrothermally synthesized carbon-coated lithium iron phosphate (LiFePO 4 / C composite) synthetic method, comprising the following steps:

[0036] (1) LiFePO 4 Synthesis of precursors: FeSO was weighed at a molar ratio of 1:1:3 4 .7H 2 O, H 3 PO 4 and LiOH.H 2 O, FeSO 4 .7H 2 O, H 3 PO 4 Dissolve in 50 ml of double distilled water, then add 0.2 g of ascorbic acid to prevent Fe 2+ Oxidized to Fe 3+ , and finally added the dissolved LiOH.H 2 O, quickly transfer the solution to a 500 ml stainless steel reaction kettle, place it in a collector type magnetic heating stirrer, set the temperature to 120°C and stir for 2h. After the reactor was cooled to room temperature, the reaction product was centrifuged, washed with double distilled water and dispersed in alcohol, and then dried in a vacuum oven for 2 hours to obtain a light green powder.

[0037] (2) LiFePO 4 Synthesis of / C precursor: the precursor powder obtained in step (1) and ascorbic acid were mixed ...

Embodiment 3

[0040] A hydrothermally synthesized carbon-coated lithium iron phosphate (LiFePO 4 / C composite) synthetic method, comprising the following steps:

[0041] (1) LiFePO 4 Synthesis of precursors: FeSO was weighed at a molar ratio of 1:1:3 4 .7H 2 O, H 3 PO 4 and LiOH.H 2 O, FeSO 4 .7H 2 O, H 3 PO 4 Dissolve in 50 ml of double distilled water, then add 0.2 g of ascorbic acid to prevent Fe 2+ Oxidized to Fe 3+ , and finally added the dissolved LiOH.H 2 O, quickly transfer the solution to a 500 ml stainless steel reaction kettle, place it in a collector type magnetic heating stirrer, set the temperature to 120°C and stir for 2h. After the reactor was cooled to room temperature, the reaction product was centrifuged, washed with double distilled water and dispersed in alcohol, and then dried in a vacuum oven for 2 hours to obtain a light green powder.

[0042] (2) LiFePO 4 Synthesis of / C precursor: the precursor powder obtained in step (1) and ascorbic acid were mixed ...

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Abstract

The invention discloses a method of preparing lithium ion battery anode material, namely, carbon coated lithium iron phosphate by utilizing ascorbic acid as reducing agent and carbon source, and the method comprises: adding ascorbic acid in a reaction solution to prevent Fe2<+> from being oxidized to Fe3<+>, and hydrothermal synthesizing LiFePO4; adding the ascorbic acid in the LiFePO4 to serve as reducing agent and carbon source to prepare a LiFePO4 / C precursor; and roasting the LiFePO4 / C precursor at a high temperature under the shield of argon atmosphere to obtain lithium iron phosphate uniformly coated by carbon. The method disclosed by the invention wraps the carbon to control the morphology of the crystalline grain and improve the lithium-ion diffusion coefficient of lithium iron phosphate so as to obtain a lithium iron phosphate material with uniform dimension and excellent electrochemical performance. The preparation method disclosed by the invention is simple and economic and is suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to a preparation method of lithium iron phosphate, in particular to a method for preparing a carbon-coated lithium iron phosphate composite material by a hydrothermal synthesis method. Background technique [0002] The research on high-capacity and high-current lithium-ion batteries is not only very important to the development of electric vehicles, but also to the effective storage and utilization of clean energy such as wind, electricity, and solar energy. However, the development of lithium-ion batteries is largely restricted by the improvement of the performance of electrode materials, so the research on high-performance cathode materials is an effective way to solve the bottleneck of lithium-ion battery applications. [0003] The earliest proposed cathode material is LiCoO with a layered structure 2 Materials, after a long period of development, the current positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 莫祥银冯晓叁丁林飞
Owner NANJING NORMAL UNIVERSITY
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