Multi-element crystal type lithium iron phosphate positive electrode material and preparation method thereof, lithium ion battery and electric equipment

Abstract

The invention provides a multi-element crystal type lithium iron phosphate positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment. The preparation method of the multi-element crystal type lithium iron phosphate positive electrode material comprises the following steps: mixing raw materials including a lithium source, a phosphorus source, water and iron sources with various particle sizes, and carrying out first ball milling to obtain a first solid-liquid mixture; sanding the first solid-liquid mixture to obtain a second solid-liquid mixture; mixing the second solid-liquid mixture with a carbon source, and performing hydrothermal reaction to obtain a third solid-liquid mixture; and drying the third solid-liquid mixture to obtain a positive electrode material precursor, and calcining the positive electrode material precursor in a reducing atmosphere to obtain the multi-element crystal type lithium iron phosphate positive electrode material. The raw material of the lithium ion battery comprises the multi-element crystal type lithium iron phosphate positive electrode material. The electric equipment comprises the lithium ion battery. The preparation method provided by the invention is simple in process and suitable for industrial production, and the obtained lithium iron phosphate positive electrode material is high in compaction density and excellent in electrochemical performance.

Description

technical field [0001] The present application relates to the field of lithium-ion batteries, in particular to a multi-component crystalline lithium iron phosphate cathode material and a preparation method thereof, lithium-ion batteries and electrical equipment. Background technique [0002] In recent years, lithium-ion batteries, which are the main components of clean energy, have been used in various fields of society. Among them, compared with the near-mature lithium-ion battery negative electrode materials, the relatively slow development of positive electrode materials directly restricts the research and application of lithium-ion batteries. [0003] In lithium-ion batteries, the products that have been marketed in the positive electrode materials include lithium manganese oxide, lithium cobalt oxide, ternary materials, lithium manganese iron phosphate, and lithium iron phosphate. The structure of lithium manganese oxide is unstable, and it is easy to decompose from a ...

AI Technical Summary

Problems solved by technology

Among them, the acidity of oxalate in the ferrous oxalate process is relatively strong, and the requirements for equipment or solvents are relatively high; the performance of lithium iron phosphate prepared by the iron red process is poor, and the product uniformity is low

Lithium iron phosphate prepared using iron phosphate as a precursor has made its debut in power battery applications, but its relatively high processing cost and disadvantages in low-temperature performance have become more prominent in practical applications. How to balance cost, low temperature and High-pressure compaction has become an industry problem

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