basic introduction

The lithium cobalt oxide battery has a stable structure, high capacity ratio, and outstanding comprehensive performance, but its safety is poor and the cost is very high. It is mainly used in small and medium-sized batteries, and is widely used in notebook computers, mobile phones, MP3 / 4 and other small electronic equipment Said voltage 3.7V. Lithium cobalt oxide has the advantages of simple production process and stable electrochemical performance, so it was first commercialized. The first-generation lithium cobaltate has a low-pressure solid density, and at most about 0.55 lithium ions can be reversibly deintercalated. Excessive lithium ion deintercalation will cause the structural phase change of the material, the lattice deoxygenation, and the oxidative decomposition of the electrolyte The service life is short, so it is eliminated by the society; the high-density synthesis process around 2000, by increasing the sintering temperature and the number of sintering times of lithium cobaltate, synthesizing single-crystal primary grains of more than a dozen microns The compaction density of the lithium acid electrode is increased to more than 4.0 g / cm3, and the second generation of lithium cobalt oxide was born, making it more important for its application in the small battery market. In order to adapt to the development of the times, lithium cobalt oxide must also be gradually replaced. The energy density of most lithium ion battery cathode materials needs to be improved urgently, and lithium cobalt oxide has much room for improvement in energy density. In order to improve this performance, it needs The modification of lithium cobaltate is mainly concentrated in these two aspects: one is to enlarge the lithium cobaltate powder particles and realize single crystallization to increase the compacted density of the material and thereby increase the energy density; the other is Doping the material and coating the surface with an inert material to improve the discharge voltage and cycle performance of the material to increase the energy density. Lithium cobalt oxide adapts to the changes of the times, improves energy and density, keeps pace with the times, and sticks to the C position in the application of 3C products.

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