Method for synthesizing LiFePO4 by using biosurfactant

Abstract

The invention relates to a method for synthesizing LiFePO4 by using a biosurfactant, which belongs to the technical field of the biochemical industry. The Li2CO3, the (NH4)2HPO4 and the FeSO4.7H2O react in equal molar ratio and then are added with a biosurfactant (draught beer), an LiFePO4 precursor is prepared by a coprecipitation method, and then the LiFePO4 precursor is sintered under microwave to obtain the product. Since the biosurfactant is added in during the preparation process of the precursor, the synthesized LiFePO4 has more ideal particle morphology: spherical particles, uniform size, 1-2mum of grain size in average and even dispersion. The process has the advantages of easy control, low production cost, short preparation cycle and feasibility of the industrialization.

Description

technical field [0001] The invention relates to a method of synthesizing LiFePO by using biosurfactant 4 The method belongs to the field of biochemical technology. Background technique [0002] With the development of portable electronic products, new battery materials have become a research hotspot, LiFePO 4 With its advantages of no pollution, low cost, and good safety performance, it is considered to be a potential substitute material for lithium-ion batteries. Since the material is rarely used, it is a frontier field, and work on materials, preparation, and performance has yet to be carried out. [0003] In phosphate iron ore, LiFePO 4 The content is not high, and there are impurities, the electrochemical performance is average. Therefore, LiFePO in lithium-ion secondary batteries 4 Mostly synthetic. At present, the synthesis methods reported in the literature mainly include: high-temperature solid-phase method, hydrothermal synthesis method, co-precipitation method...

AI Technical Summary

Problems solved by technology

[0004] Various methods have their advantages and disadvantages. The high-temperature solid-phase method is simple to operate and is convenient for industrial production. However, the prepared material particles are large and the materials are not mixed uniformly, so it is difficult to obtain high-purity positive electrode materials.

Liquid phase methods such as hydrothermal synthesis and co-precipitation can make the raw materials mix at the molecular level in the liquid phase, which is conducive to the preparation of uniformly dispersed LiFePO 4 particles, improved LiFePO 4 Electrochemical properties of positive electrode materials, but the liquid phase reaction conditions are strictly controlled, the synthesis cycle is long, and the cost is correspondingly increased

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