Method for preparing lithium iron phosphate by hydrothermal method and lithium iron phosphate prepared by method
A lithium iron phosphate and hydrothermal technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of complex operation, affecting the pH value of the reaction system, lengthy process, etc., and achieve the goal of inhibiting particle growth, simple preparation method, The effect of high discharge specific capacity
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Example Embodiment
[0035] Example 1
[0036] In this example, LiOH·H 2 O, H 3 PO 4 and FeSO 4 ·7H 2 O was used as the raw material, and the molar ratio Li:Fe:P was 3:1:1 for compounding, and 0.3mol LiFePO was prepared by an improved hydrothermal method. 4 . details as follows:
[0037] a. LiOH·H 2 O was prepared into a 3 mol / L lithium source solution, and the H 3 PO 4 Prepare a 1.5 mol / L phosphorus source solution, slowly add the phosphorus source solution to the lithium source solution in proportion to prepare mixed solution A;
[0038] b. The FeSO 4 ·7H 2 O is formulated into a 1 mol / L iron source solution, and LiFePO is theoretically generated by adding the iron source solution into the iron source solution. 4 20wt.% starch of the total weight is mixed to make mixed solution B;
[0039] c. Slowly add the mixed solution B to the mixed solution A under mechanical stirring to form a reaction system solution, transfer the reaction system solution to a 1L reaction kettle for reaction,...
Example Embodiment
[0042] Embodiment 2
[0043] This example is the same as the method in Example 1, wherein the amount of starch added in the iron source solution is the theoretically generated LiFePO 4 10 wt. % of the total weight, and other components and amounts are the same.
[0044] For the LiFePO prepared in this example 4 The product is observed by scanning electron microscope, and it can be seen that the LiFePO prepared in this example 4 The product is prismatic and is as Figure 4 The particle size is about 1 μm in length and 200 nm in thickness, indicating that the main reason for the change in product morphology is the change in starch content. It can be seen that starch plays a role in inhibiting particle size and controlling the formation of morphology in the reaction of the system. The results of high-resolution transmission electron microscopy showed that there were disordered small lithium iron phosphate particles on the surface of the product, indicating that starch played t...
Example Embodiment
[0045] Embodiment 3
[0046] This example is the same as the method in Example 1, wherein the amount of starch added in the iron source solution is the theoretically generated LiFePO 4 30 wt. % of the total weight, and other components and amounts are the same.
[0047] For the LiFePO prepared in this example 4 The product is observed by scanning electron microscope, and it can be seen that the LiFePO prepared in this example 4 The product is prismatic, and the particle size is about 1 μm in length and 200 nm in thickness; LiFePO 4 The product is similar to Example 2, and there are small lithium iron phosphate particles arranged disorderly on the surface of the particles, such as scanning electron microscope. Figure 5 It can be seen that there is an obvious trend in the control of particle size and morphology with the change of starch content in the reaction system. At 20 wt.%, a spherical lithium iron phosphate product can be prepared, and the decrease or increase of sta...
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