Method for preparing lithiumion cell positive material Iron-lithium phosphate

Abstract

Mechanical solid phase method for synthesizing lithium ferric phosphate includes following steps: mixing iron powder, ferric phosphate, lithium phosphate, doping elements of phosphate, conducting agent or predecessor of conducting agent according to proportion evenly; placing the mixed admixture into ball milling container with inert gases being filled and ball milling for 18-36 hours; then putting the produced result from ball milling into high-temperature furnace with inert gases such as nitrogen gas and argon gas being filled; heating up in 10-30 deg.C / minute heating rate, baking at constant temperature 450-750 deg.C for 10-60 minutes; then cooling at 10-30 deg.C / minutes cooling rate, cooling the admixture to room temperature so as to obtain powder of lithium ferric phosphate or powder of doped powder of lithium ferric phosphate. Advantages are: feasible, no pollution, high specific capacity and good cycle performance.

Description

Technical field:

[0001] The invention belongs to a method for preparing a cathode material of a lithium ion battery, in particular to a method for preparing lithium iron phosphate, an anode material of a lithium ion battery, by adopting a mechanical solid-phase synthesis process. Background technique:

[0002] LiFePO was first reported by A.K.Padhi in 1997 4 Since it has the function of intercalating lithium, the olivine-type phosphate lithium intercalating material, LiMPO4 (M: Mn, Fe, Co, Ni), has attracted much attention as a promising cathode material for lithium-ion batteries. Among them, LiFePO4 with a theoretical capacity of 170mAh / g is considered to be the most promising cathode material for lithium-ion batteries due to its rich iron resources, low price, excellent thermal stability and environmental friendliness.

[0003] At present, the methods for synthesizing lithium iron phosphate include high-temperature solid-phase reaction method, liquid-phase co-deposition m...

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