What is the production process of lithium iron phosphate battery?

Lithium iron phosphate battery as a kind of high performance secondary green battery with olivine structure of lithium iron phosphate (LiFePO4) can reversibly embedded lithium, and has high capacity, good cycle performance, electrochemical performance stability, low price, is the first choice of a new generation of green cathode materials, especially as a power lithium ion battery material.Lithium iron phosphate discovery caused the attention of many electrochemical researchers at home and abroad, in recent years, with the more and more wide application of lithium ion battery, more and more research on lithium iron phosphate battery more and more, especially in the past two or three years is widely used to produce electric vehicles, lithium iron phosphate battery as the power source of electric vehicles, which makes the heat of lithium iron phosphate battery has been high, since lithium iron phosphate battery is widely used, the lithium iron phosphate battery production process is how?

We take shmu new energy production process as an example to introduce:

What is the production process of lithium iron phosphate battery?

1. Dry the iron phosphate acid and remove the water

(1) Drying process: stainless steel box bowl filled with raw material iron phosphate into the oven, adjust the oven temperature of 22020℃, and dry for 6-10 hours.Feed transfer to the next process to the rotary furnace sintering.

(2) Rotary converter sintering process: after the rotary converter heating up and the nitrogen gas meet the requirements, feed (materials from the previous process oven), adjust the temperature of 54,020℃, sintering for 8-12 hours.

2. Grinding machine mixing process

During normal production, two grinding machines are put into operation at the same time, and the specific feeding and operation are the same (one equipment can be run separately during commissioning). The procedure is as follows:

(1) Lithium carbonate grinding: weighing 13Kg of lithium carbonate, 12Kg of sucrose, 50Kg of pure water, mixed grinding for 1-2 hours.suspend.

(2) Mixed and grinding: add 50Kg of iron phosphate and 25Kg of pure water to the above mixture, mix and grind for 1-3 hours.Stop, and feed to the disperser.Sampling granularity.

(3) Cleaning: weigh 100Kg of pure water, clean the grinder in 3-5 times, and all the lotion is transferred into the dispersion machine.

3. Dispersmachine and material dispersion process

(1) Transfer 2.2 About 500Kg (including the materials for cleaning the grinder) of the two grinders (or one grinder twice) into the dispersion machine, then add 100Kg of pure water, adjust the mixing speed, fully stir and disperse for 1-2 hours, and wait for the pump into the spray drying equipment.

4. Spray-drying process

(1) Adjust the inlet temperature of the spray drying equipment is 22020℃, the outlet temperature is 11010℃, the feed speed is 80Kg / hr, and then start the feed spray drying to get the drying material.

(2) The solid content can be adjusted to be 15%~30% according to the size of the spray particle size.

5. Adjust the press of the pressure of the hydraulic press to 150 tons and 175 tons respectively, load the spray-dried material into the mold, and keep the pressure under, and compact into blocks according to the time.Put into the bowl and turn into the push furnace.At the same time, several groups of bulk samples were added to compare with crushed materials.

6. Push plate furnace sintering heat up first, pass nitrogen, meet the atmosphere requirements below 100ppm, push the push plate furnace, heating section 300-550℃, 4-6 hours; constant temperature section 750℃ 8-10 hours; cooling section 6-8 hours, feeding.

7. Superfine roller pressure grinding

Input the materials burned by the push plate furnace into the ultra fine grinding, adjust the speed, conduct rolling grinding, and send them into the ultra fine grinding for grinding.Granularity was tested for each batch.

8. Screening and packaging

Sift and package the grinding materials.5Kg and 25Kg specifications.

9. Inspection and warehousing

Product inspection, label and storage.Including: product name, inspection person, material batch, date.

The above is the production process of shmu new energy lithium iron phosphate battery production process, I believe that through the above introduction of you should understand the lithium iron phosphate battery production process