Abstract: Provided are an organic compound, an electroluminescent material and an application thereof. The organic compound has a structure represented by Formula I. With the design of the spiro parent structure and the introduction of specific substituents, the organic compound can prevent materials from stacking and reduce the crystallinity of the molecule. The design of the spiro structure and substituents make the organic material have a high triplet state energy level Ti, and the nitrogen heterocycle and its linking groups make the organic compound have characteristics of good electron and hole transport performances. The organic compound has suitable HOMO and LUMO energy levels, facilitating the coordination of adjacent layers in terms of energy level. The organic compound also has advantages of high glass-transition temperature and good molecular thermal stability. Therefore, the organic compound can effectively improve the light emitting efficiency and lifetime of the device.

Abstract: Described are lithium iron phosphate cathode materials for lithium secondary batteries and methods of preparation thereof. Better cathode materials may be produced by two carbon processes. The first carbon process comprises mixing lithium compounds, iron compounds, phosphorous compounds and a first carbon additive, and heating the mixture to a first temperature. The second carbon process comprises adding a second carbon additive to the to the product of the first carbon process and heating the mixture to a second temperature. The cathode material so produced exhibits superior electrical properties.

Abstract: Lithium iron phosphate cathode materials for lithium secondary batteries and methods of preparation thereof are disclosed. Better cathode materials may be produced by multiple annealing and/or heating steps. The annealing step can be carried out before and/or after the heating steps to provide cathode materials, which exhibit superior electrical properties. In some instances, divalent iron compounds are incorporated as starting materials.

Abstract: Described are lithium iron phosphate cathode materials for lithium secondary batteries and methods of preparation thereof. Better cathode materials may be produced by two carbon processes. The first carbon process comprises mixing lithium compounds, iron compounds, phosphorous compounds and a first carbon additive, and heating the mixture to a first temperature. The second carbon process comprises adding a second carbon additive to the to the product of the first carbon process and heating the mixture to a second temperature. The cathode material so produced exhibits superior electrical properties.

Abstract: Lithium iron phosphate cathode materials for lithium secondary batteries and methods of preparation thereof. Better cathode materials may be produced by multiple annealing and/or heating steps. The annealing step can be carried out before and/or after the heating steps to provide cathode materials, which exhibit superior electrical properties.