Preparation of LiFePO4
A solution and iron salt technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of complex steps and high preparation costs, and achieve the effects of simple steps, excellent performance and low price
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Example Embodiment
[0032] Embodiment 1: a kind of LiFePO of this example 4 The preparation method, its steps are:
[0033] a. Add phosphorus-containing compound solution, surfactant and carbon-coated carbon source to 10ml iron salt solution for hydrothermal synthesis; the iron salt solution is FeSO 4 , the phosphorus compound is H 3 PO 4 , the surfactant is PEG, and the carbon-coated carbon source is sucrose; the molar ratio of Fe atoms to P atoms is 1:1, the molar ratio of Fe atoms to surfactant is 1:1, and the sucrose is 5% of FeSO4 mass.
[0034] b. Introduce nitrogen for 10min, and then exhaust air;
[0035] c. Add 10ml of lithium salt solution, the lithium salt solution is LiOH, and the molar ratio of Fe atoms to Li atoms is 1:2.5;
[0036] d. Introduce nitrogen for 10min, control the pH value to 9.0, heat up to 180°C for hydrothermal treatment for 360min;
[0037] e. Suction filtration, washing and drying to obtain LiFePO whose pure phase crystals are flaky or columnar 4 finished pro...
Example Embodiment
[0042] Embodiment 2: a kind of LiFePO of this example 4 except that the molar ratio of Fe atoms to P atoms in step a is 1:1.2, the remaining steps are the same as those of the method in Example 1.
[0043] After the analysis of the obtained product by X-ray diffraction technology, it is also pure LiFePO with no impurities and good crystallinity. 4 There is no change in the sample, SEM and Example 1, and the electrochemical behavior shows that its first discharge capacity is increased.
[0044] For the X-ray diffraction data of the product in this example, see figure 1 in b.
[0045] The first discharge curve of this embodiment is shown in Figure 5 in b.
Example Embodiment
[0046] Embodiment 3: a kind of LiFePO of this example 4 except that the molar ratio of Fe atoms to P atoms in step a is 1:1.4, the remaining steps are the same as those of the method in Example 1.
[0047] The X-ray diffraction data of the obtained product is indistinguishable from Example 1 and Example 2. Compared with Example 1, the scanning electron microscope is obviously transformed from a tablet to a columnar shape. The electrochemical data shows that the first discharge capacity of the product is compared with Example 1 and Comparative Example 1. There is obvious attenuation.
[0048] The SEM pictures of this example are shown in image 3 , is a column, illustrating the LiFePO prepared by the preparation method of the present invention 4 The sample has controllability on the product morphology under different conditions.
[0049] The first discharge curve of this example is shown in Figure 5 in the c.
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