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LiFePO4 precursor hollow sphere and preparation method thereof

A technology of precursors and hollow spheres, which can be used in electrical components, battery electrodes, circuits, etc., and can solve problems such as difficult access to precursors

Active Publication Date: 2013-03-13
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing preparation of LiFePO 4 There are many methods for material precursors, such as solid phase ball milling, sol-gel method, co-precipitation method, etc., but these methods are difficult to obtain hollow spherical LiFePO 4 Precursor

Method used

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  • LiFePO4 precursor hollow sphere and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] 1. Weighing of raw materials: Weigh 1.2 g lithium hydroxide, 4.7 g iron phosphate, 1.6 g glucose and 9.6 g oxalic acid respectively, and measure 250 ml deionized water.

[0027] 2. Mixing: Mix the raw materials weighed above with deionized water, heat and stir to dissolve.

[0028] 3. Atomization: Pour the above solution into an ultrasonic nebulizer, and perform ultrasonic atomization at a frequency of 1.7MHz to form mist.

[0029] 4. Drying: The wind blows the droplets through a high-temperature furnace for drying at a drying temperature of 150°C, and collects irregular lumps of LiFePO after drying. 4 Precursor, scanning electron microscope photo as figure 2 shown. The schematic diagram of the device is as figure 1 shown.

Embodiment 2

[0031] 1. Weighing of raw materials: Weigh 1.2 g lithium hydroxide, 4.7 g iron phosphate, 1.6 g glucose and 9.6 g oxalic acid respectively, and measure 250 ml deionized water.

[0032] 2. Mixing: Mix the raw materials weighed above with deionized water, heat and stir to dissolve.

[0033] 3. Atomization: Pour the above solution into an ultrasonic nebulizer, and perform ultrasonic atomization at a frequency of 1.7MHz to form mist.

[0034] 4. Drying: The wind blows the droplets through a high-temperature furnace to dry at a temperature of 200°C. After drying, collect irregular lumps of LiFePO 4 Precursor, scanning electron microscope photo as image 3 shown.

Embodiment 3

[0036] 1. Weighing of raw materials: Weigh 1.2 g lithium hydroxide, 4.7 g iron phosphate, 1.6 g glucose and 9.6 g oxalic acid respectively, and measure 250 ml deionized water.

[0037] 2. Mixing: Mix the raw materials weighed above with deionized water, heat and stir to dissolve.

[0038] 3. Atomization: Pour the above solution into an ultrasonic nebulizer, and perform ultrasonic atomization at a frequency of 1.7MHz to form mist.

[0039] 4. Drying: The wind blows the droplets through a high-temperature furnace to dry at a temperature of 250 ° C. After drying, the hollow spherical LiFePO is collected. 4 The precursor, the outer diameter of the hollow sphere is 100nm-5um, and the shell thickness is about 27nm. Scanning electron microscope photos as Figure 4 As shown, the energy dispersive X-ray spectrum as Figure 7 As shown, the transmission electron microscope pictures are shown as Figure 10 shown.

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Abstract

The invention relates to a LiFePO4 precursor hollow sphere and a preparation method thereof. The outer diameter of a precursor hollow sphere which is used as a LiFePO4 anode material of a lithium ion secondary battery is 10 nm-100 mu m and the wall thickness is 1 nm-10 mu m. A LiFePO4 anode material precursor with a hollow spherical structure is obtained through carrying out ultrasonic atomization drying on a solution prepared from a lithium compound, an iron compound, a phosphorus compound, a complexing agent and a carbon source. According to the LiFePO4 precursor hollow sphere and the preparation method thereof, a foundation of preparing the LiFePO4 anode material precursor with the hollow spherical structure is laid; and the structure is good for sufficiently contacting the LiFePO4 anode material with electrolyte, reducing a dispersion route of lithium ions and improving the rapid charging / discharging performance of the LiFePO4 anode material.

Description

technical field [0001] The present invention relates to LiFePO 4 The technical field of lithium-ion secondary battery manufacturing as the positive electrode material, especially a kind of LiFePO with special morphology 4 Cathode material precursor hollow sphere and its synthesis method. Background technique [0002] LiFePO 4 It is one of the preferred positive electrode materials for power lithium-ion secondary batteries. It has been vigorously promoted and used by various countries in recent years. memory effect. But affect LiFePO 4 The disadvantage of going to practical use is that it has poor conductivity and is not suitable for high-current charging and discharging. The current improvement method is to improve its electronic conductivity and speed up the diffusion rate of lithium ions, while LiFePO 4 There are very few studies on the preparation of positive electrode materials into hollow spheres. [0003] Hollow spherical LiFePO 4 The material can be in full co...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 唐月锋刘学文沈飞倪亮杨华珍戎葆华陆彦文陈庆霖唐琨吴星云刘盼星彭慕洋谢双飞陈延峰
Owner NANJING UNIV
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