Method of preparing positive electrode composite material of Lithium ion cell contg, ferrous phosphate lithium salt-carbon
A technology for lithium ferrous phosphate and lithium-ion batteries, which is applied in electrode manufacturing, battery electrodes, phosphorus compounds, etc. It can solve the problems of difficult control of product purity, complicated preparation process, and high price, and achieve excellent cycle performance and high purity. , cheap effect
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[0017] Example 1
[0018] Mix 0.5 mol of lithium hydroxide and 0.5 mol of iron phosphate, put them in a nylon tank, and add 80 ml of alcohol. After mixing for 2 hours on a ball mill, the mixture is mixed into 14 grams of polypropylene and placed in a tube furnace. Under a nitrogen atmosphere of 1 liter / min, the temperature was increased to 700° C. at a rate of 5° C. / min, and the temperature was kept constant for 10 hours, and then the temperature was lowered to room temperature.
[0019] The carbon content of the obtained composite material is 2.5%, and the XRD spectrum is shown in figure 1 , Compared with the standard card, it is olivine LiFePO with intact crystal form 4 , And no diffraction peak of carbon is observed.
[0020] The composite material obtained in Example 1 was used to prepare electrodes in the following manner.
[0021] Weigh the composite material obtained in Example 1 at a mass ratio of 80:10:10: carbon black: polytetrafluoroethylene, grind uniformly to make an...
Example Embodiment
[0022] Example 2:
[0023] Mix 0.5 mol of lithium hydroxide, 0.25 mol of ferric oxide and 0.5 mol of ammonium dihydrogen phosphate into a nylon tank, add 80 ml of alcohol, mix thoroughly on a ball mill for 2 hours, and mix the mixture into 20 grams The polypropylene was put into a tube furnace, and under a nitrogen atmosphere of 5 liters / minute, the temperature was raised to 700°C at a rate of 5°C / minute, and the temperature was kept constant for 20 hours, and then the temperature was lowered to room temperature. The carbon content of the obtained composite material was measured to be 4.6%. The electrode sheet was also prepared according to the method of Example 1. After being assembled into a battery, it was charged and discharged at a rate of 0.2C, and the reversible capacity was determined to be 157mAh / g.
Example Embodiment
[0024] Example 3:
[0025] Mix 0.5 mol of lithium hydroxide and 0.5 mol of iron phosphate, put them in a nylon tank, and add 80 ml of alcohol. After mixing on a ball mill for 1 hour, the mixture is mixed with 25 grams of polyethylene and placed in a tube furnace. Under a nitrogen atmosphere of 1 liter / min, the temperature was increased to 500° C. at a rate of 5° C. / min, and the temperature was kept constant for 24 hours, and then the temperature was lowered to room temperature. The carbon content of the obtained composite material was measured to be 3.1%, and the electrode sheet was prepared according to the method of Example 1. After being assembled into a battery, the battery was charged and discharged at a rate of 0.5C, and the reversible capacity was determined to be 148mAh / g.
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