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Preparation method for high-activity material

A high-activity, lithium-source technology, applied to electrical components, electrochemical generators, battery electrodes, etc., can solve the problems of cumbersome lithium iron phosphate synthesis process, difficult large-scale production, and irregular product shapes, etc., to achieve good cycle Stability, improvement of high rate charge and discharge performance, and effect of reducing activation energy

Inactive Publication Date: 2017-05-31
德清崎辉机械科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the process is relatively simple, the high-energy ball milling takes a long time and consumes a lot of energy.
[0006] The synthesis process of the above-mentioned lithium iron phosphate is relatively cumbersome, and it is not easy to achieve large-scale production, and the product has irregular shape, low tap density, and unstable performance, resulting in poor post-processing affinity

Method used

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  • Preparation method for high-activity material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 185 g of lithium carbonate, 575 g of ammonium dihydrogen phosphate, 397 g of iron oxide, 1.0 g of magnesium oxide, 60 g of glucose and 15 g of carbon black, use polyethylene glycol as a dispersant, and control the speed of the ultrafine ball mill-sand mill Continuous grinding at 300 r / min for 4 h to obtain the desired slurry. Adjust the inlet and outlet temperatures of the spray drying to 300 and 150°C, respectively, and dry and granulate at a feed rate of 3 L / min to obtain the precursor of lithium iron phosphate. The former body was sintered at a heating rate of 10 °C / min to 700 °C for 5 h in an atmosphere furnace filled with high-purity nitrogen, and then naturally cooled to room temperature. Finally, the sintered product is taken out, pulverized, and mechanically integrated to obtain the lithium iron phosphate positive electrode active material. Using metal lithium sheet as the negative electrode, the charge and discharge voltage is 2.0~3.95 V, 0.05C / 0.1C char...

Embodiment 2

[0032] Weigh 520 g of lithium dihydrogen phosphate, 397 g of iron oxide, 1.0 g of magnesium oxide, 100 g of sucrose and 10 g of acetylene black, use citric acid as a dispersant, and control the speed of the ultrafine ball mill-sand mill to 300 r / min for continuous circulation Grind for 6 h to obtain the desired slurry. Adjust the spray drying inlet and outlet temperatures to 300 and 150°C respectively, and dry and granulate at a feed rate of 2 L / min to obtain the lithium iron phosphate precursor. The body was sintered at 650 °C for 4 h at a heating rate of 10 °C / min in an atmosphere furnace with high-purity nitrogen, and then cooled naturally to room temperature. Finally, the sintered product is taken out, pulverized, and mechanically integrated to obtain the lithium iron phosphate positive electrode active material. The measured tap density of the material is 1.28 g / cm 3 . Using metal lithium sheet as the negative electrode, charge and discharge voltage is 2.0~3.95 V, char...

Embodiment 3

[0034]With 185 g of lithium carbonate, 575 g of ammonium dihydrogen phosphate, 898 g of ferrous oxalate, 0.4 g of titanium oxide, 40 g of glucose and 10 g of carbon black, use absolute ethanol as a dispersant, and control the speed of the ultrafine ball mill-sand mill Continuous grinding at 400 r / min for 5 h to obtain the desired slurry. Adjust the inlet and outlet temperatures of the spray drying to 350 and 150°C, respectively, and dry and granulate at a feed rate of 2 L / min to obtain the precursor of lithium iron phosphate. The body was first heated to 720 °C for 8 h at a heating rate of 10 °C / min in an atmosphere furnace filled with high-purity nitrogen, and then naturally cooled to room temperature. Finally, the sintered product is taken out, pulverized, and mechanically integrated to obtain the lithium iron phosphate positive electrode active material. Using metal lithium sheet as the negative electrode, the charge and discharge voltage is 2.0~3.95 V, 0.05C / 0.1C charge a...

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Abstract

Disclosed is a preparation method for a high-activity material. The preparation method comprises the following steps of weighing a lithium source, an iron source, a phosphorus source, a carbon source and an additive based on certain proportions, wherein the molar ratio of Li to Fe to P is 0.9-1.2 to 1 to 1, and the molar ratio of the additive to the lithium source is 0.001-0.05 to 1; adding the raw materials into an ultra-fine ball milling-grinder comprising a dispersing agent to be fully grinded to obtain uniformly dispersed slurry; conveying the slurry to a spray dryer to be subjected to drying and pelleting to obtain a lithium iron phosphate precursor; and performing sintering on the lithium iron phosphate precursor in an atmosphere furnace for one time, and cooling instantly, and then performing smashing and mechanical integrating to obtain a lithium iron phosphate product. The preparation method is simple in technological process, low in production cost and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of energy materials and relates to a preparation method of highly active materials. Background technique [0002] Lithium-ion batteries have been widely used in the 3C market due to their light weight, high energy density, high working voltage, long cycle life, and environmental protection. However, under the dual pressure of global energy shortage and people's increasing attention to environmental protection, lithium-ion batteries are more and more favored by power tools. Therefore, it is key to study new battery cathode materials to improve the performance of lithium-ion batteries. [0003] At present, the lithium-ion cathode material is mainly LiCoO 2 , LiNiO 2 , LiMn 2 o 4 . LiCoO 2 The comprehensive performance is excellent, but the price is expensive, the toxicity is relatively high, and there are certain safety problems. LiNiO 2 The theoretical capacity is relatively high (275mAh / g), but the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 王晓溪王晓义王诗琨张宁丰胜
Owner 德清崎辉机械科技有限公司
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