Sagger for positive electrode material of lithium ion battery

Abstract

The invention discloses a sagger for a positive electrode material of a lithium ion battery. The sagger is composed of a low-thermal-expansion material and / or a negative-thermal-expansion material anda lithium ion battery positive electrode material corrosion-resistant material, wherein the low-thermal-expansion material and / or the negative-thermal-expansion material and the lithium ion battery positive electrode material corrosion-resistant material are mixed and molded into a sagger blank, and the sagger blank is sintered to obtain the sagger for the positive electrode material of the lithium ion battery. The sagger disclosed by the invention has the characteristics of thermal shock resistance and lithium ion battery positive electrode material erosion resistance, the service life of the sagger is greatly prolonged, the refractory material consumption of the lithium ion battery positive electrode material is reduced, and the environment is protected. The sagger provided by the invention does not need an additional coating to protect the sagger, so a production process, required equipment and manpower are greatly reduced; and the sagger can be produced only by simple forming equipment and annealing equipment, so production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a sagger for positive electrode materials of lithium ion batteries. Background technique [0002] In recent years, with the continuous advancement of technology and the continuous improvement of the performance of lithium-ion batteries, lithium-ion batteries have gradually been widely used in electric vehicles, notebook computers, smart phones, aerospace technology and other fields. Lithium-ion batteries are generally composed of three parts: positive electrode material, negative electrode material and electrolyte solution. Among them, the positive electrode materials of lithium-ion batteries mainly include lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), lithium nickelate (LiNiO 2 ) and lithium iron phosphate (LiFePO 4 ) and other materials. Most of these lithium-ion battery cathode materials are made by high-temperature solid-phase synthesis...

AI Technical Summary

Problems solved by technology

However, this method itself has many disadvantages: First, the thermal expansion coefficient of the mullite-cordierite sagger itself is very low, but materials that are traditionally considered to be unreactive with lithium carbonate or lithium oxide, such as zirconia, magnesium oxide, etc. The thermal expansion coefficients of aluminum oxide, magnesium aluminum spinel, etc. are very high. When heating and cooling repeatedly, the base material and protective layer of the sagger will crack or fall off due to the mismatch of thermal expansion coefficients. Effectively improve the service life of the saggar; Second, whether it is dip coating, spray coating or brush coating, it not only requires special spraying equipment or labor, but also waits for the coating after the coating is applied. Drying greatly reduces production efficiency and increases production costs

Third, the general sagger base material is formed by dry forming method. The formed base material itself has a high packing density, and the shrinkage rate is very small during later sintering.

The advantage of this is that the bonding force between the sagger base material and the protective layer is high, and it is not easy to fall off, but the disadvantage is that the sintering shrinkage of the protective film and the base material is different, resulting in cracking and peeling during sintering, which greatly reduces Increased yield and increased production costs

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