Method for producing amorphous precursor serving as anode material of lithium ion battery

Abstract

The invention discloses a method for producing an amorphous precursor serving as an anode material of a lithium ion battery. The amorphous precursor serving as the anode material of the lithium ion battery has a basic structural formula of MyPO4. The method comprises the following steps of: 1, under the condition that water, a water solution or solvent with a lower temperature or a temperature lower than a room temperature exists, extracting at least one solvend of an M metal sulfate, an M metal nitrate and an M metal halide with a soluble phosphate under the alkaline condition to generate a precipitate, collecting, washing, and drying to obtain the amorphous precursor. The node material of the lithium ion battery, which is produced from the precursor, is LixMyPO4, Li<+> in charge and discharge processes are more favorably inserted and separated, material impedance is reduced, the milling time of the material can be shortened, and the processing energy consumption can be reduced, and the reaction is mild and controllable; and the method is especially suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of secondary batteries, and in particular relates to a preparation method of an active cathode material of a lithium ion battery, a corresponding electrode and a battery. Background technique [0002] Various cathode materials have been intensively studied in the rechargeable battery industry. LiCoO 2 Due to its high working voltage and long cycle life, it has become the most commonly used cathode material in commercial lithium-ion batteries. Although LiCoO 2 It is a widely used cathode material in portable rechargeable battery applications, but its high cost, high toxicity, and relatively low thermal stability make it severely limited as a cathode material for rechargeable batteries. These limitations have prompted many studies examining the methods used to process LiCoO 2 to improve its thermal stability. However, the safety issue due to low thermal stability is still LiCoO 2 A key limitation of cath...

AI Technical Summary

Problems solved by technology

Most of these prior art fabrication methods such as solid state reaction and sol-gel method are still plagued by violent and uncontrollable precursor reactions, high processing costs and heterogeneous material composition, etc., resulting in battery poor material properties

In addition, iron phosphate, the precursor of lithium iron phosphate nanomaterials in most methods, is in the olivine crystalline state. On the one hand, the reaction requires a temperature higher than room temperature and a long reaction time, and the precursor in the crystalline state will subsequently generate active cathode materials. The milling process is both time-consuming and energy-consuming. On the other hand, in the process of charging and discharging, Li + In and out of FePO 4 It is necessary to overcome the hindrance of its lattice and increase the internal resistance of the material

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