Layered metal hydroxide salts have attracted considerable attention in various applications due to their superior photoelectric, physical, and chemical properties. Here, a simple in situ growth hydrothermal approach is reported to prepare hierarchical cobalt hydrochloride (Co 2 (OH) 3 Cl) microspheres composed of octahedron-like subunits. Based on the multiple functional triethanolamine and time-dependent morphology evolution, the formation of the unique sphere structures can be elucidated by a hierarchical self-assembly of anisotropic nanoparticles. When used as lithium ion battery (LIB) anodes, this Co 2 (OH) 3 Cl microsphere shows very large reversible specific capacity (1196 mA h g -1 at 0.2 A g -1 ), excellent rate capability (720.4 mA h g −1 at 4.0 A g −1 ), and long-life stability (802 mA h g -1 with 81.1% retention after 500 cycle tests at 4.0 A g -1 ). The excellent electrochemical performance is attributed to the improvement of electrical conductivity and fast ionic diffusion in the electrode by improving the microarchitecture and functionally introducing Cl -.

The effect of stress triaxiality on mechanical properties of 6061 aluminium alloy extruded profiles with different specimens was studied. Macroscopic mechanical property of the various specimen was got through universal testing machine. At the same time, stress triaxiality of different specimens was obtained using the method of finite element simulation. And then the fracture strain of each specimen was outputted by DIC. Fracture modes of 6061 aluminium alloy with different stress triaxiality were studied by SEM. The results show that taking tensile samples as comparison, the cross-sectional area of some notched specimens decreases and the peak load increases. Among them, the minimum cross-sectional area of the R5 central hole specimen is 20% smaller than that of the tensile sample, and the peak load is 28% larger. The fracture strain of the alloy increased with the decrease of stress triaxiality. For the same notch specimens, along the path direction, stress triaxiality of R5 notch specimens, R5 Center-hole specimens and R20 Arc notched specimens increased 47%, 17.8%, 25% respectively. According to the analysis of fracture morphology, the main fracture of 6061 aluminium alloy was ductile fracture. When the stress triaxiality is large, the dimples are small and sparsely distributed, and when the stress triaxiality is small, the dimple is large and evenly distributed. Finally, the Johnson-Cook model material parameters of 6061 aluminum alloy are fitted based on the tensile test results of different shapes of specimens, which can accurately simulate the elastic-plastic deformation and fracture instability of 6061 aluminum alloy under different stress states.

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