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Preparation method of spherical lithium iron phosphate

A lithium iron phosphate, spherical technology, applied in the field of lithium battery cathode materials, can solve the problems of large particle size of spherical lithium iron phosphate, difficult coating process, complicated process flow, etc., and achieves easy subsequent coating, good sealing, The effect of simple process flow

Inactive Publication Date: 2010-02-03
台州市杰南投资有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydrothermal method is limited to the preparation of a small amount of powder. If the amount of preparation is expanded, there are many restrictions, especially the design of a large high-temperature resistant reactor is very difficult and the cost is also high.
Moreover, the lithium iron phosphate made by the above method has the following two disadvantages: (1) low tap density; (2) weak points such as low electrical conductivity
However, the spherical lithium iron phosphate produced by this method has a large particle size, and it is not easy to carry out the subsequent coating process, and the affinity is poor, and it is easy to crack when coating; The process is more complicated, and the lithium iron phosphate produced has edges and corners

Method used

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  • Preparation method of spherical lithium iron phosphate
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix the raw material of Example 1 in Table 1 with 13.2 g of carbon black and 51.8 g of sucrose, then add it into 200 g of absolute ethanol solution, and stir thoroughly so that the raw material mixture is fully dissolved at 40-60° C. The aqueous solution is dried and compacted, placed in an inert atmosphere reaction furnace, slowly heated to 600-700°C, maintained at this temperature for 20-25 hours, and then slowly cooled to room temperature to obtain primary lithium iron phosphate powder.

[0037] Such as figure 1 As shown, the cooled primary lithium iron phosphate powder is put into the material sealing collection device 1, and the lithium iron phosphate powder is sent to the spiral heating and rolling feeding device 3 under the protection of an inert atmosphere with the low-pressure blower 2, and the high-pressure blower 4 The lithium iron phosphate powder at the bottom of the spiral heating and rolling feeding device 3 is blown into the accelerator 5 to accelerate t...

Embodiment 2

[0039] Mix the raw material of Example 2 in Table 1 with 12.8 g of acetylene black and 52.6 g of glucose, then add it into 200 g of absolute ethanol solution, and stir thoroughly to make the raw material mixture fully dissolve at 40-60°C, and then dissolve it at 80-90°C The aqueous solution is dried and compacted, placed in a nitrogen atmosphere reaction furnace, slowly heated to 700-800°C, maintained at this temperature for 15-20 hours, and then slowly cooled to room temperature to obtain primary lithium iron phosphate powder.

[0040] Put the cooled primary lithium iron phosphate powder into the material sealing collection device 1, send the lithium iron phosphate powder under the protection of nitrogen atmosphere to the spiral heating and rolling feeding device 3 with the low-pressure blower 2, and use the high-pressure blower 4 to heat the spiral The lithium iron phosphate powder at the bottom of the rolling feeding device 3 is blown into the accelerator 5 and accelerated t...

Embodiment 3

[0042] Mix the raw material of Example 3 in Table 1 with 13.2 g of flake graphite and 50.8 g of polyvinyl alcohol, then add it into 200 g of absolute ethanol solution, stir fully, and fully dissolve the raw material mixture at 40-60 ° C, and dissolve it in 90- Dry the aqueous solution at 100°C, briquette, place in a nitrogen atmosphere reaction furnace, slowly heat to 800-900°C, keep this temperature for 10-15 hours, and then slowly cool to room temperature to obtain primary lithium iron phosphate powder.

[0043] Put the cooled primary lithium iron phosphate powder into the material sealing collection device 1, send the lithium iron phosphate powder under the protection of nitrogen atmosphere to the spiral heating and rolling feeding device 3 with the low-pressure blower 2, and use the high-pressure blower 4 to heat the spiral The lithium iron phosphate powder at the bottom of the rolling feeding device 3 is blown into the accelerator 5 and accelerated to the nozzle 6 under th...

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Abstract

The invention provides a preparation method of spherical lithium iron phosphate, which belongs to the technical field of lithium battery anode materials and solves the problems of low tap density, lowconductivity, irregular shape, unstable performance, poor post-processing affinity, and the like of lithium iron phosphate prepared by the preparation method of the prior lithium iron phosphate. Thepreparation method of spherical lithium iron phosphate comprises the following steps: A, preparing lithium iron phosphate powder; and B, preparing the spherical lithium iron phosphate. The preparationmethod of the spherical lithium iron phosphate has simple technical process and low production cost and is suitable for large-scale production. The prepared spherical lithium iron phosphate has smallgranularity, large tap density and high first discharging specific capacity at room temperature.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate, in particular to a preparation method of spherical lithium iron phosphate; it belongs to the technical field of lithium battery cathode materials. Background technique [0002] Lithium battery products have the advantages of good cycle performance, high energy density, and wide operating temperature range, so they are widely used in portable electronic products such as mobile communications, notebook computers, electronic instruments, and are gradually developed as vehicles for electric vehicles and hybrid vehicles. Use batteries. This also promotes the development of lithium batteries in the direction of high performance, low cost, green environmental protection and safety. The improvement of the performance of lithium-ion batteries and the broadening of the application range largely depend on the improvement of cathode materials. According to different positive electrode mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45B01J2/00
Inventor 王坚
Owner 台州市杰南投资有限公司
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