Analytical solid phase synthesis method of lithium batteries positive material process (course)

The Course

What is a solid phase synthesis method of lithium batteries positive material? Such as lithium manganese oxide, lithium salts of will (such as LiCO3, LiNO3, LiOH · H2O, etc) and manganese salt [as MnCO3, Mn (NO3) 2] or manganese oxide (such as electrolytic MnO2, Mn2O3, Mn3O4 etc) by a certain way after grinding mix, in high temperature firing long time, directly opposite a solid should happen. Its characteristic is a mixture with solid forms solid materials direct response. In order to ensure enough reaction rate, solid material must be heating to 750 degree or above. For lithium manganese oxide solid phase synthesis reactions, there are at least lithium, manganese dioxide and lithium manganese oxide in three things. In this kind of solid phase mixture occur between the process of solid instead should, atoms or ions through each object is to the interface, and through various forms are area, creating the atom or ion in more solid phase of the interactive diffusion, therefore, dynamic factors on the reaction rate has played a decisive role.
Because in the reaction, generation product LiMn2O4 involve large amounts of microscopic structure when rearrangement, which involves the fracture of the chemical bonds and retooling, atom or ion will be quite large distance (atomic scale) of migration. Therefore, need a high enough temperature to make these atoms or ion spread to new interface reaction, and need through the electrical heating or microwave heating to achieve high temperature solid instead should be.
The high temperature solid phase method, to LieCO3 for lithium source, chemical MnO2 (CMD) and electrochemical Mn02 (EMD) for manganese source, water mixture with ethanol for scattered media synthetic spinel positive LiMn20 type materials. The particular way is: says take a certain proportion of LieCO3 and MnO2, mechanical mixed grinding, and then add in a certain proportion of ethanol/water mixture, stirring in the next 24 h soak, get a type colloidal mixture, top, 100 degrees in under vacuum drying 2 h, grinding to a fine powder, and then in the air in the 550 prepayment roasting several hours, in about 650 ℃ roasting for hours, and the last in the 750 degrees more than ten hours of roasting, natural cooling that get the sample.
By XRD, BET, TEM and electrochemical test on the material characterized. The results showed that 750 ℃ to the preparation of a good sample of spinel structure, specific surface area were about 420 m/g and 220 m/g, product uniform distributed particle size, average particle size for 200 nm. In 4 x 10 A/cm2 and 3.0 ~ 4.35 V conditions constant current charge and discharge, its first discharge capacity is more than 110 mA · h/g, efficiency is more than 90%, and has A good circulation reversible.
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