Abstract: A fiber-metal laminate having a honeycomb sandwich structure and a preparation method thereof are provided. Firstly, based on material reduction processing technology, a recessed polygonal structure is obtained according to a design trajectory, and an upper layer and a lower layer are closed to form a recessed honeycomb sandwich structure. Then, processed surfaces of the upper layer and the lower layer are chemically treated to passivate the processed surfaces, with the aim of increasing the adhesion between a fiber layer and the metal layers. Then, a viscous mixture is filled into the recessed structures of the metal layers to ensure the multifunctional characteristics and impact resistance of the fiber-metal laminate. Then, a fiber prepreg is laid between the upper layer and the lower layer to obtain a prefabricated fiber-metal laminate. Finally, the prefabricated fiber-metal laminate undergoes thermal curing treatment under pressure in a hot-pressing tank, thereby obtaining the fiber-metal laminate.

Abstract: Lithium manganese oxide material used in lithium ion battery is disclosed herein. The lithium manganese oxide material may be doped with suitable dopant. The lithium manganese oxide material may be represented by a first formula of Li1+xMyMn2?y?xO4, wherein the value of ‘x’, in the first formula, satisfies a relation ?0.1<x<0.3 and the value of ‘y’, in the first formula, satisfies a relation a relation 0?y?0.2. The lithium manganese oxide material may further be coated with a shell capping layer. The shell capping layer may be made of a carbon or a compound having a second formula, Li1+xMyMn2?y?xO4. In an aspect, the value of ‘x’, in the second formula, may satisfy a relation ?0.1<x<0.3. Further, the value of ‘y’, in the second formula, may satisfy a relation 0?y?0.2.