Preparation method of high-energy and high-power density nano-scale lithium iron phosphate powder

Abstract

The invention provides a preparation method of a nano-scale lithium iron phosphate powder. The method comprises the following steps: a. preparing a precursor through an improved sol-gel method; b. drying the gel prepared in the step a at the temperature of 60-90 DEG C; and c. transferring the product of the step b into an atmosphere furnace, heating to 500-800 DEG C at a heating rate of 1-20 DEG C / min under the inert or weak reducing atmosphere, sintering for 8-25 hours at constant temperature and crushing after cooling so as to obtain the high-energy density and high-power density spherical nano-scale lithium iron phosphate powder. The preparation method has the advantages of simple preparation process, few controllable factors, short production cycle, low cost and energy consumption and good repeatability, and is applicable to industrialized production. Used raw materials are all cheap, non-toxic and pollution-free inorganic compounds. The prepared powder has the advantages of good uniformity, high purity and controlled granularity and appearance.

Description

A preparation method of high-energy and high-power-density nano-lithium iron phosphate powder technical field The invention relates to the technical field of electrochemical energy storage power supply, in particular to a preparation method of high-energy, high-power-density lithium iron phosphate nanopowder. The prepared spheroidized and nanoscale lithium iron phosphate powder can be used in various types of lithium ion batteries and supercapacitors, and is especially suitable for power lithium ion battery systems. Background technique The development of miniaturized and multi-functional portable electronic equipment has fully driven the in-depth development and continuous improvement of mobile energy around the world; the development of aerospace and national defense cutting-edge technology equipment has also raised high-performance, high-security requirements for mobile energy. and other requirements; the aggravation of the oil crisis and the deterioration of the enviro...

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Problems solved by technology

2. Raw materials and production routes are not competitive

However, the existing sol-gel method has the disadvantages of long production cycle, complex synthesis process, and many control factors, and at least one raw material in the combination of raw materials used is an expensive and toxic metal organic alkoxide. This greatly limits the large-scale application of this method

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