Method for preparing micron frame-shaped manganese series lithium ion battery cathode material

Abstract

The invention belongs to the field of energy sources, particularly relating to a method for preparing a micron frame-shaped manganese series lithium ion battery cathode material. The method is characterized by comprising the following steps of: alternately processing a MnCO3 micron square block by utilizing low-temperature calcining and pickling to form amorphous manganese dioxide with a micron frame structure, reducing at a low temperature by utilizing LiI, calcining in vacuum and crystallizing to form a micron frame of LiMn2O4. By means of the method, the prepared material has a hollow structure so shat a stress generated during the intercalation / de-intercalation of Li is weakened and the stability of the material is high and has a porous structure to provide electron / ion channels; a distance of the Li intercalation / de-intercalation is shortened by utilizing a nanoscale frame wall, thereby enhancing dynamic rate of Li intercalation / de-intercalation, improving multiplying power and cycle performances of the material, and effectively preventing phenomena that nanometer materials aggregate, pass through diaphragm and the like in a reaction; and the size and the distribution of pore diameter can be controlled by utilizing differences of calcining conditions and pickling conditions so that the lithium ion battery cathode materials suitable for different needs are easy to prepare. The method for preparing the micron frame-shaped manganese series lithium ion battery cathode material has the characteristics of simple operation, low energy consumption and the like and is suitable for large-scale preparation and production.

Description

technical field [0001] The invention belongs to the field of energy, and in particular relates to a method for preparing a cathode electrode material of a micron frame-shaped manganese-based lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used in various portable electronic products, medical devices, power storage systems, aerospace and other fields due to their high voltage, high energy density, large output power, low self-discharge, and long service life. At the same time, it is green and environmentally friendly. Applying it to various vehicles can greatly reduce carbon dioxide emissions and alleviate environmental problems. Currently, LiCoO is the cathode material for lithium-ion batteries 2 The price is high, the toxicity is high, and the layered structure is easily damaged when discharged with a large current, which makes it difficult for lithium-ion batteries to develop into power supply devices. while LiMn 2 o 4 Low price, no ...

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Problems solved by technology

However, the general solid-state reaction method to prepare LiMn 2 o 4 When it needs to be calcined above 600°C for several hours, it is difficult to control the shape. The product has a large particle size and a wide distribution, and often contains impurities due to different degrees of reduction. Therefore, it is necessary to find an appropriate preparation method to prepare hollow Porous LiMn 2 o 4 , take advantage of the structure to obtain a high-performance lithium-ion battery cathode electrode material with high electrochemical activity and good structural stability of lithium intercalation and desorption

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