Process for preparing anode composite material of LiFePO4/C lithium ion battery
A lithium-ion battery and composite material technology, which is applied in the field of preparation of lithium-ion battery cathode composite materials, can solve the problems of restricting large-scale industrial production, difficult control of product purity, high price of petrochemical products, etc., and achieve uniform solid phase reaction, Low production cost and good reproducibility
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Embodiment 1
[0014] After 2.39 grams of lithium hydroxide, 7.98 grams of ferric oxide, 14.90 grams of ammonium phosphate and 10.81 grams of sawdust were fully mixed with a ball mill for 2 hours, the mixture was put into a tube furnace, and under a nitrogen atmosphere of 7 liters per minute, Ramp to 750°C at a rate of 5°C / min, hold at this temperature for 8 hours, then cool to room temperature.
[0015] The XRD spectrum of the composite material is shown in Figure 1. Compared with the standard card, it is an olivine-type LiFePO with a good crystal form. 4 , and no diffraction peaks of carbon and other impurities were observed.
[0016] Using the composite material obtained in Example 1, an electrode was prepared in the following manner.
[0017] Weigh the composite material obtained in Example 1 at a mass ratio of 80:10:10: carbon black: polytetrafluoroethylene, and grind it evenly to make an electrode. 1.0mol L in a mixed solvent of dimethyl ester (volume ratio 1:1) -1 LiPF 6 As the el...
Embodiment 2
[0019] After fully mixing 2.636 grams of lithium hydroxide, 15.08 grams of iron phosphate and 0.5 grams of bamboo powder with a ball mill for 1 hour, the mixture was put into a tube furnace and heated at 8 °C / min under a nitrogen atmosphere of 10 liters / minute. The rate was ramped to 850°C and held constant at that temperature for 16 hours, then cooled to room temperature. Electrode sheets were also prepared according to the method of Example 1, and after being assembled into a battery, it was charged and discharged at a rate of 0.1C, and the measured reversible capacity was 145mAh.g -1 .
Embodiment 3
[0021] After thoroughly mixing 4.06 g of lithium carbonate, 15.08 g of iron phosphate and 2.08 g of wood flour with a ball mill for 1 hour, the mixture was placed in a tube furnace at a rate of 3 °C / min under an argon atmosphere of 0.3 L / min. Raise to 650°C and hold at this temperature for 24 hours, then cool to room temperature. Electrode sheets were also prepared according to the method of Example 1, and after being assembled into a battery, it was charged and discharged at a rate of 0.3C, and the measured reversible capacity was 143mAh.g -1 .
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