Core-shell structure lithium manganate and preparation method thereof

Abstract

The invention provides lithium manganate of a core-shell structure and a preparation method of the lithium manganate. According to the lithium manganate of the core-shell structure, a LiMn2O4 electrode material on the inner layer is separated from electrolyte, reaction between the electrode and the electrolyte can be inhibited, dissolution loss of manganese is reduced, the electrochemical performance and high-temperature performance are improved, and the problem that the cycle life of the battery made of a lithium manganate battery cathode material is short under the working conditions such as high temperature and large current is solved. The lithium manganate of the core-shell structure with the advantages of small impurity phases and high specific capacity can be prepared under relatively simple conditions by using low-price raw materials, the lithium manganate of the core-shell structure is simple in process, mild in conditions, low in energy consumption, low in cost and environmentally friendly, and large-scale production is easily realized. According to the core-shell structure, the crystal form of lithium manganate is effectively protected, and dissolution of bivalent manganese is relieved. Moreover, according to the super-capacitor performance of Co3O4, impact of large current on lithium manganate can be alleviated, and the fall time of lithium manganate is prolonged, so that the cycling stability of the battery is enhanced. When the temperature rises, the performance of the material is strengthened.

Description

technical field

[0001] The invention relates to core-shell structure lithium manganese oxide and a preparation method thereof. Background technique

[0002] Lithium-ion battery is a secondary battery with high energy density, high power density and long life, which plays an important role in modern society. In various mobile devices, electric vehicles, and power tools, the role of lithium-ion batteries is almost irreplaceable. Cathode material is one of the decisive factors for the performance and cost of lithium-ion batteries, and is an important direction for the improvement of lithium-ion batteries. At present, the active cathode material used in lithium-ion batteries is mainly lithium cobalt oxide, but due to the lack of cobalt resources, high price, and poor safety performance, it is not conducive to the popularization and application of lithium-ion batteries; lithium iron phosphate has many expected advantages. Ion batteries have also been widely tried, but with less...

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