Preparation method of phosphate potential boron-doped carbon-wrapped phosphoric acid iron-lithium material

Abstract

The invention relates to a preparation method of a phosphate potential boron-doped carbon-wrapped phosphoric acid iron-lithium material. According to the preparation method, phosphoric acid iron, a lithium source, boric acid, oxalic acid and a carbon source which are taken as raw materials are prepared into a carbon-wrapped mixed primary raw material in a liquid phase through water bath stirring, and the carbon-wrapped mixed primary raw material is subjected to rapid high-temperature thermal treatment to generate a carbon-wrapped boron-doped lithium iron phosphate LiFeP1-xBxO4 / C (x is greater than or equal to 0.05 and less than or equal to 0.20) anode material. The lithium iron phosphate anode material prepared by using the preparation method has the advantages that crystal grains grow sufficiently, the grain appearance is regular, and excellent electrochemical property is achieved. The preparation method provided by the invention has the advantages of simplicity and easiness in synthesis process, environmental-friendliness, easiness in in-scale production and industrialization.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrochemical power source materials, and has wide application prospects in the fields of commonly used secondary lithium ion batteries and positive electrode materials of power energy batteries. Background technique [0002] With the advent of the era of "low-carbon economy" and the rapid development of communication, transportation and electronic information technology, people have put forward higher requirements for the volume, energy, and cycle life of power supplies. Traditional chemical power supplies such as lead-acid, nickel Cadmium batteries cannot meet the market demand well due to problems such as memory effect, low energy density, and environmental pollution during synthesis and use. Among the currently widely concerned batteries, lithium-ion batteries have become the most popular for adapting to market changes due to their advantages such as small size, light weight, large ca...

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Problems solved by technology

However, solid-phase methods, hydrothermal methods, rheological phase methods, and sol-gel methods all have certain problems in large-scale production, and the energy consumption in the synthesis process is high, which does not meet the current low-carbon and environmental protection requirements, and is not easy to industrialize Applications, for example: Although the process steps of the solid-phase method are simple, the raw material particles are agglomerated during the mixing process of the raw materials, resulting in uneven mixing of the raw materials, resulting in uneven distribution of elements in the product and incomplete lattice structure, which in turn affects the cycle stability of the product properties and consistency; the hydrothermal method generally uses ferrous iron salt as the initial raw material, which makes it difficult to ensure the chemical stability of the raw material during the feeding process, and the hydrothermal method is generally carried out in a high-temperature and high-pressure reactor, resulting in changes in the synthesis conditions Uniformity is difficult to control; methods such as rheological phase method and sol-gel method have complicated operation steps, resulting in too many influencing factors in the synthesis process, which leads to the disadvantage that it is not easy to control in the process of industrialization

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