Method for improving electrochemical performance of lithium iron phosphate by applying copper/graphene
A technology of lithium iron phosphate and carbon-coated lithium iron phosphate, which is applied in the field of applying copper/graphene to improve the electrochemical performance of lithium iron phosphate, can solve the problem of lithium ion batteries with limited results, insufficient performance improvement, and complicated preparation methods. and other problems, to achieve the effect of improving cycle stability, improving rate discharge performance, simple operation process and process
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Embodiment 1
[0032] The present embodiment comprises the following steps: preparing 200mL of a mixed aqueous solution containing 0.01g of graphene oxide and 0.08g of copper sulfate; adding 2g of commercial carbon-coated lithium iron phosphate powder to the above mixed solution, and stirring at a speed of 180 rpm Stir for 2 minutes; wash the lithium iron phosphate powder after the above reaction with water, filter it with suction, and vacuum dry it in a vacuum drying oven at -0.08MPa.
[0033] As shown in Figure 1, compared with the untreated lithium iron phosphate powder (a), the copper / graphene composite surface-treated lithium iron phosphate powder (b) has an obvious graphene layer on the surface, and copper is detected by electron spectroscopy. The existence of (b) has the dual morphology characteristics of chemically reduced graphene and copper.
[0034] Such as figure 2 and image 3 As shown, using N-methylpyrrolidone (NMP) as a solvent, the lithium iron phosphate powder before and ...
Embodiment 2
[0037] The present embodiment comprises the following steps: preparing 150mL of a mixed aqueous solution containing 0.2g of graphene oxide and 0.02g of copper chloride; adding 10g of commercial carbon-coated lithium iron phosphate powder to the above mixed solution, and stirring at a speed of 120 rpm Stir for 40 minutes; wash the lithium iron phosphate powder after the above reaction with water, filter it with suction, and place it in a vacuum drying oven at -0.08MPa for vacuum drying.
[0038] The charge and discharge performance test was carried out on the lithium iron phosphate samples before and after treatment. The results of charge-discharge cycle test show that the specific capacity at 0.2C and 20C is about 147 and 75mAh / g, respectively.
Embodiment 3
[0040] The present embodiment comprises the following steps: preparing 100mL of a mixed aqueous solution containing 0.003g of graphene oxide and 0.04g of copper nitrate; adding 1g of commercial carbon-coated lithium iron phosphate powder to the above mixed solution, stirring at a stirring speed of 300 rpm 10 minutes; after the above reaction, the lithium iron phosphate powder was washed with water, filtered with suction, and placed in a vacuum drying oven at -0.08MPa to vacuum dry.
[0041] The charge and discharge performance test was carried out on the lithium iron phosphate samples before and after treatment. The test results of charge-discharge cycles show that the specific capacities at 0.2C and 20C are about 155 and 69mAh / g, respectively.
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