Industrial device and process for lithium iron phosphate liquid-phase thermal synthesis

Abstract

The invention provides an industrial device for lithium iron phosphate liquid-phase thermal synthesis, which comprises a liquid-phase reaction kettle used for mixing raw materials for preparing lithium iron phosphate and auxiliaries to form nano-scale or micron-scale lithium iron phosphate particles under proper reaction conditions; the washing and separating integrated kettle is communicated to the mixed liquid outlet of the liquid-phase reaction kettle, at least one group of separating components for dynamically filtering the mixed liquid are arranged in the washing and separating integrated kettle, and each separating component comprises a hollow rotating shaft rotatably arranged on the kettle and a plurality of hollow separating membranes arranged on the hollow rotating shaft at intervals; the separation membrane can enable liquid to penetrate through the surface to enter the inner cavity, the inner cavity of the separation membrane is communicated with the hollow rotating shaft, and a liquid outlet of the hollow rotating shaft is communicated with the reaction liquid recovery unit; the washing and separating integrated kettle is communicated with a washing solvent inlet pipe and a wet material outlet pipe, a liquid outlet of the hollow rotating shaft is further communicated with a washing liquid recycling unit, and the lithium iron phosphate battery positive electrode material with excellent electrochemical performance can be prepared by adopting the device.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and relates to an industrialized device and a process for liquid-phase thermal synthesis of lithium iron phosphate. Background technique [0002] With the rapid development of the national economy, energy and environmental issues have gradually become challenges to sustainable development, and renewable energy has been more and more widely used, among which the lithium battery industry has become one of the important industrial directions for the development of the national economy. Lithium iron phosphate cathode material has high theoretical specific capacity, cheap and abundant raw materials, good thermal stability, small hygroscopicity and excellent charge-discharge cycle performance in the fully charged state, and has become the research field in the field of power and energy storage. and production development focus. [0003] LiFePO in nature 4 It exists in the form of lithium ...

AI Technical Summary

Problems solved by technology

[0003] LiFePO in nature 4 It exists in the form of phospholithium ore, but its impurity content is high, so it is not suitable for direct use as the positive electrode material of lithium-ion batteries. LiFePO used for the positive electrode materials of lithium-ion batteries 4 is synthetic

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