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A kind of preparation method of lithium ferrous phosphate/c composite material with high specific surface area

A high specific surface area, lithium iron phosphate technology, applied in phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of poor low temperature performance, low electrical conductivity, low ion diffusion coefficient, etc., and achieve the effect of simple process

Active Publication Date: 2018-03-06
贵州芭田新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some shortcomings in lithium iron phosphate cathode materials, such as low electrical conductivity, low ion diffusion coefficient, poor low temperature performance, and poor rate discharge capability, which lead to many limitations in its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take 18.6g of battery-grade nano-iron phosphate (99% purity, molecular formula FePO 4 2H 2 O) Mix with 3.79g of battery-grade micro-powder lithium carbonate (Shanghai Zhongli Industrial Co., Ltd., purity 99.9%), put it into a mortar for grinding, add 2.24g of analytically pure methyl ethyl ketone, grind for 30 minutes, and pour the mixture into a small Disperse disc mixer, then add 18.6g 3% polyvinyl alcohol (molecular weight: 5000) aqueous solution, stir at 300 rpm for 2 hours to form a uniform slurry, then slowly add 1.86g high specific surface area activated carbon while stirring (Made in Korea, with a specific surface area of ​​1000 m 2 / g), and then stirred at 800 rpm for 2 hours to form a uniform slurry;

[0016] (2) Dry the slurry at 105° C. for 5 hours by blowing air to become a massive solid;

[0017] (3) Under the protection of nitrogen with a purity of 99.99%, heat the block solid to 600°C for sintering at a rate of 2°C / min, keep it for 2 hours, heat i...

Embodiment 2

[0021] (1) Take 18.6g of battery-grade nano-iron phosphate (99% purity, molecular formula FePO 4 2H 2 O) Mix with 3.79g of battery-grade micro-powder lithium carbonate (Shanghai Zhongli Industrial Co., Ltd., purity 99.9%), put it into a mortar for grinding, add 2.24g of analytically pure methyl ethyl ketone, grind for 30 minutes, and pour the mixture into a small Add 18.6g of 3% polyvinyl alcohol (molecular weight: 10,000) aqueous solution to a dispersing disc mixer, stir at a speed of 300 rpm for 2 hours to form a uniform slurry, and then slowly add 1.86g of high specific surface area activated carbon while stirring (Made in Korea, specific surface area 1500 m 2 / g), and then stirred at 800 rpm for 2 hours to form a uniform slurry;

[0022] (2) drying the slurry at 105° C. for 3 hours by blowing air to become a massive solid;

[0023] (3) Under the protection of nitrogen with a purity of 99.99%, heat the block solid to 600°C for sintering at a rate of 2°C / min, keep it for ...

Embodiment 3

[0027] (1) Take 18.6g of battery-grade nano-iron phosphate (99% purity, molecular formula FePO 4 2H 2 O) Mix with 3.79g of battery-grade micro-powder lithium carbonate (Shanghai Zhongli Industrial Co., Ltd., purity 99.9%), put it into a mortar for grinding, add 2.24g of analytically pure methyl ethyl ketone, grind for 30 minutes, and pour the mixture into a small Disperse disc mixer, then add 18.6g 3% polyvinyl alcohol (molecular weight: 8000) aqueous solution, stir at 300 rpm for 2 hours to form a uniform slurry, then slowly add 1.86g high specific surface area activated carbon while stirring (produced in South Korea, with a specific surface area of ​​1200 m 2 / g), and then stirred at 800 rpm for 2 hours to form a uniform slurry;

[0028] (2) Dry the slurry at 105° C. for 4 hours by blowing air to become a massive solid;

[0029] (3) Under the protection of nitrogen with a purity of 99.99%, heat the block solid to 600°C for sintering at a rate of 2°C / min, keep it for 2 hou...

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Abstract

The invention relates to a preparation method of a lithium iron phosphate / C composite material with high specific surface area, which comprises the following steps: 1)taking battery grade nano ferric phosphate and battery grade lithium carbonate for mixing according to mol ratio of Fe: Li being at 0.99:1, grinding and adding butanone, regrinding, uniformly dispersing, adding 3% of polyvinyl alcohol aqueous solution, stirring to obtain uniform slurry, then slowly adding active carbon with high specific surface area, stirring to obtain the uniform slurry; 2)drying the slurry at 1-5 DEG C for 3-5 hours through air blast to become block solid; 3)under nitrogen protection, heating the block solid to 600 DEG C with speed of 2 DEG C / minute and sintering, keeping for 2 hours, heating to 720 DEG C with speed of 2 DEG C / minute and sintering, keeping for 4 hours, then stopping heating, naturally cooling to room temperature; and 4)grinding the sintered products, passing through a sieve with 325 meshes to obtain the lithium iron phosphate / C composite material with high specific surface area.

Description

technical field [0001] The invention belongs to the field of novel chemical energy storage, and in particular relates to a preparation method of lithium iron phosphate / C composite material with high specific surface area. Background technique [0002] Lithium ferrous phosphate material is a positive electrode material for lithium ion batteries. It has the advantages of low price, abundant raw materials, non-toxicity, good thermal stability, high specific energy, long cycle life, long service life, outstanding safety performance and no pollution to the environment. Its theoretical specific capacity is 170mAh / , and its theoretical operating voltage is about 3.45V. It is a new type of positive electrode material for lithium-ion batteries with the most potential. However, lithium iron phosphate cathode materials still have some shortcomings, such as low electrical conductivity, low ion diffusion coefficient, poor low temperature performance, and poor rate discharge capability, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58C01B25/45
CPCY02E60/10
Inventor 叶丽光郝德利
Owner 贵州芭田新能源材料有限公司