Lithium-containing electrode material sintering method

Abstract

PROBLEM TO BE SOLVED: To provide a method for sintering a lithium-containing electrode material, by which manufacturing time and cost thereof can be reduced. ŽSOLUTION: The method for sintering a lithium-containing electrode material comprises the steps of: introducing a mixture of a granular lithium compound and M into an inside of a metal container with a lid; heating the metal container at two stages in a temperature range between 300-700°C and a temperature range between 500-900°C to perform heat treatment to the mixture inside the metal container; and pulverizing (polishing) the mixture after the heat treatment to obtain a powdery lithium-containing electrode material, where the M is an element of Fe, P, Co, Ni, Mn, V and C, and an oxide or compound of the elements. Ž

Description

technical field [0001] The invention relates to a sintering method for a lithium-containing electrode material, in particular to a sintering method for a lithium-containing electrode material suitable for a lithium-ion secondary battery. Background technique [0002] The generally known lithium-ion secondary battery (abbreviation: lithium battery) has the advantages of long cycle life, large current discharge capacity, fast charging capacity, high conversion efficiency, light weight, short size, and high safety. It has been favored by portable information electronics in recent years. Products, gasoline-electric hybrid vehicles, electric bicycles, electric tools and other power and energy storage markets are favored, and have gradually replaced lead-acid and nickel-metal hydride batteries, and the market demand is steadily expanding and increasing. [0003] The internal materials of lithium batteries include positive electrode materials, negative electrode materials, separato...

AI Technical Summary

Problems solved by technology

It can be seen that in the sintering process of the existing lithium iron phosphate oxide powder materials, the use of consumable protective gases such as Ar / H2 still occupies a considerable proportion of cost

[0006] Furthermore, in the sintering process of the existing lithium battery electrode materials, most of the containers used for the materials are high-purity alumina crucibles, which have some limitations and inconveniences in use. First, it is difficult to control the formed crucible. The tightness of the pot and its cover; the other is that the temperature of the protective gas and the crucible body are uneven when the temperature is lowered, which may cause the alumina crucible to break; the other is that the alumina crucible Under the condition of rapid temperature drop, there is a risk of cracking the crucible, and a longer annealing time is required, and the consumption of protective gas and the cost of man-hours during the sintering process cannot be effectively reduced.

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