Synthetic method for improving tap density of LiNi0.5Co0.3Mn0.2O2 positive electrode material

Abstract

The invention provides a synthetic method for improving the tap density of a LiNi0.5Co0.3Mn0.2O2 positive electrode material. According to the method, the tap density of the synthesized positive electrode material is high, the specific discharge capacity of the material is high, and the cycling stability is good. The LiNi0.5Co0.3Mn0.2O2 positive electrode material prepared through the method has high charge-discharge specific capacity and good cycle performance, and can be used as the positive electrode material of a stored energy lithium ion battery. The method of changing different compressed tablets is used for improving the tap density of the positive electrode material, operation is simple, the effect is obvious, no additional chemical substances are needed, a good effect can be achieved, novel impurities can be prevented from being led in, and thus good economic value is achieved.

Description

Technical field: [0001] The present invention relates to a kind of LiNi 0.5 co 0.3 mn 0.2 o 2 The synthesis method belongs to the technical field of electrode material synthesis. Background technique: [0002] Lithium-ion batteries continue to develop in the direction of high specific energy, requiring positive electrode material powder not only to have high mass specific capacity, but also to have high volume specific energy. Mobile phone batteries are one of the main markets for lithium-ion batteries. With the further miniaturization and intelligence of mobile phones, mobile phones have higher and higher requirements for battery capacity. It is difficult for positive electrode materials to achieve mass specific capacity in the short term. A big breakthrough, so if you want to increase the total capacity of the battery, you can only rely on increasing the volume specific capacity of the positive electrode material, and to increase the volume specific capacity, you can o...

AI Technical Summary

Problems solved by technology

[0003] Enhanced layered LiNi 0.5 co 0.3 mn 0.2 o 2 There are many methods for powder tap density, such as: preparing high-density spherical precursors by controlled crystallization, and then sintering at high temperature to form high-density layered LiNi 0.5 co 0.3 mn 0.2 o 2 Powder, controlled crystallization method is easy to control the shape and particle size of precipitated powder, but the process is long and it is difficult to control the stability of product quality; adding sintering aids in the process of sintering synthesis is also conducive to improving the tap density of sintered products. The process of this method is simple, but it is difficult to disperse the added trace additives evenly, and at the same time, foreign impurities are inevitably introduced, which will affect the electrochemical performance of the synthesized materials to a certain extent.

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