A method for preparing carbon-coated lithium iron phosphate material and its application

A technology of carbon-coated lithium iron phosphate and phosphoric acid, applied in the direction of phosphate, phosphorus oxyacid, chemical instruments and methods, etc., to achieve the effects of environmental friendliness, improved electrochemical performance, and low requirements for experimental equipment

Active Publication Date: 2021-03-05
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of development and application of new new energy vehicles, lithium-ion batteries with low cost, low energy consumption, environmental protection and pollution-free, high specific energy are required, and the traditional battery system has been difficult to meet the requirements of high energy density, so there is an urgent need to develop new High specific capacity lithium-ion battery

Method used

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  • A method for preparing carbon-coated lithium iron phosphate material and its application
  • A method for preparing carbon-coated lithium iron phosphate material and its application
  • A method for preparing carbon-coated lithium iron phosphate material and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Sample 1 # preparation

[0052] Pretreatment of raw materials: Accurately weigh 3.784g of melamine, 1.529g of lithium oxalate, and 2.396g of ferric oxide with an electronic balance, and grind them in a mortar to obtain red powder. Measure 2.05mL of phosphoric acid, and then It is added to the previous mixture, and it is ground until it becomes a homogeneous, sticky powder.

[0053] Ball milling process: vacuum-dry the wet powder at 80°C for 5 hours, crush the powder with a mortar and then ball-mill at 600 rpm for 10 hours after drying to obtain the precursor.

[0054] Calcination process: The obtained precursor was placed in a tube furnace and filled with argon gas, first heated to 350°C at a heating rate of 4°C / min, held for 4 hours, and then heated to 700°C at a heating rate of 3°C / min for 12 hours. After cooling to room temperature, the product was taken out and ground to obtain black powder. The black powder is the final product prepared by the present ...

Embodiment 2

[0055] Example 2 Sample 2 # ~9 # preparation

[0056] Sample 2 # ~9 # The preparation process and the raw materials used are the same as the sample 1 in Example 1. # The preparation differs in that the conditions during the ball milling process and the calcination process are varied. The relationship between sample numbers and preparation conditions is shown in Table 1.

[0057] Table 1

[0058]

[0059]

Embodiment 3

[0060] Structural Characterization of Example 3 Samples

[0061] for sample 1 # ~9 # X-ray powder diffraction phase analysis (XRD) was carried out. The results show that sample 1 prepared in Examples 1 and 2 # ~9 # All samples are of high purity and high crystallinity.

[0062] Take sample 1 # is a typical representative, and its XRD pattern is similar to that of LiFePO. 4 Comparison of standard spectra such as image 3 shown. Depend on image 3 It can be seen that sample 1 # The XRD diffraction patterns of the obtained samples are highly consistent, which proves that the obtained samples are samples of high purity and high crystallinity. Sample 2 # ~Sample 9 # XRD pattern of sample 1 # Similarly, the peak position was basically unchanged, and the peak intensity varied in the range of ±5% with the synthesis conditions.

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Abstract

The present application discloses a method for preparing carbon-coated lithium iron phosphate material, which is characterized in that a one-pot synthesis method is adopted, at least including the following steps: a) the mixture containing melamine compounds, lithium source and iron source is ground to obtain Precursor I; b) adding phosphoric acid to precursor I, grinding to obtain precursor II; c) vacuum drying and ball milling precursor II to obtain precursor III; d) placing precursor III in an inert atmosphere After segmental calcination, the carbon-coated lithium iron phosphate material is obtained. The method adopts a one-pot synthesis method, and is obtained through one-step reaction synthesis. The reaction conditions of the method are simple and controllable, the requirements for experimental equipment are not high, the environment is friendly, and the product yield is high. The obtained carbon-coated lithium iron phosphate (LiFePO 4 / C), the electrochemical performance of the material is effectively improved by carbon coating. The production process of the method is simple, and it is easy for industrial scale-up and commercialization.

Description

technical field [0001] The application relates to a method for synthesizing carbon-coated lithium iron phosphate, which belongs to the field of chemical engineering. Background technique [0002] Lithium-ion batteries, as the most cutting-edge rechargeable batteries, have attracted widespread attention from all over the world in the past ten years. At present, it dominates the mobile power supply market for portable electronic devices, and has become the only power supply device for mobile phones and notebook computers, and will even further enter the field of power batteries. Since Padhi et al. broke through the technical difficulties of polyanions of olive-type phosphate, LiFePO 4 It has also become a dazzling "star" in the lithium battery industry. Lithium iron phosphate has low cost, non-toxic, environment-friendly, wide sources of iron sources, high specific capacity (theoretical capacity is 170mAh / g, energy density is 550wh / kg), high discharge platform (3.6V), and lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/58H01M10/0525C01B25/26C01B25/45C01B25/37
CPCC01B25/26C01B25/375C01B25/45H01M4/366H01M4/58H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 邓雯温珍海
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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