The high compacted density LiNi<sub>0.5-x</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>Mg<sub>x</sub>O<sub>2</sub> cathode material for lithium-ion batteries was syn...The high compacted density LiNi<sub>0.5-x</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>Mg<sub>x</sub>O<sub>2</sub> cathode material for lithium-ion batteries was synthesized by high temperature solid-state method, taking the Mg element as a doping element and the spherical Ni<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub> (OH)<sub>2</sub>, Li<sub>2</sub>CO<sub>3</sub> as raw materials. The effects of calcination temperature on the structure and properties of the products were investigated. The structure and morphology of cathode materials powder were analyzed by X-ray diffraction spectroscopy (XRD) and scanning electronmicroscopy (SEM). The electrochemical properties of the cathode materials were studied by charge-discharge test and cyclic properties test. The results show that LiNi<sub>0.4985</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub> Mg<sub>0.0015</sub>O<sub>2</sub> cathode material prepared at calcination temperature 930°C has a good layered structure, and the compacted density of the electrode sheet is above 3.68 g/cm<sup>3</sup>. The discharge capacity retention rate is more than 97.5% after 100 cycles at a charge-discharge rate of 1C, displaying a good cyclic performance.展开更多
For the retaining wall and technologies to protect river levee, many patents were applied and numerous new technologies were developed according to the installation method and material. This study installed a magic re...For the retaining wall and technologies to protect river levee, many patents were applied and numerous new technologies were developed according to the installation method and material. This study installed a magic retaining wall block, which was developed as new technology product to protect river levee from running water, in actual size experimental water channel and evaluated the hydraulic performance and the stability of technology based on the increase in the flow velocity and discharge by steps. This study divided the experiment into a total of six steps and conducted it accordingly. According to the experiment results, there was no deformation of the surface of the magic retaining wall block or any soil loss at the bottom either, under the condition of maximum flow velocity of 5.37 m/s (discharge of 7.40 m<sup>3</sup>/s). To analyze the occurrence of scour and the possibility of soil loss at the bottom of a structure due to a high flow velocity, this study conducted an image analysis of Case 6 under the condition of maximum discharge, using a drone. According to the results of an analysis through the drone, there was no soil loss or flow change due to a scour at the bottom of the magic retaining wall block. The results of this study will serve as references in designing a technology applying a magic retaining wall block, and present the methods and procedures to evaluate and verify the development of any further new technology.展开更多
文摘The high compacted density LiNi<sub>0.5-x</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub>Mg<sub>x</sub>O<sub>2</sub> cathode material for lithium-ion batteries was synthesized by high temperature solid-state method, taking the Mg element as a doping element and the spherical Ni<sub>0.5</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub> (OH)<sub>2</sub>, Li<sub>2</sub>CO<sub>3</sub> as raw materials. The effects of calcination temperature on the structure and properties of the products were investigated. The structure and morphology of cathode materials powder were analyzed by X-ray diffraction spectroscopy (XRD) and scanning electronmicroscopy (SEM). The electrochemical properties of the cathode materials were studied by charge-discharge test and cyclic properties test. The results show that LiNi<sub>0.4985</sub>Co<sub>0.2</sub>Mn<sub>0.3</sub> Mg<sub>0.0015</sub>O<sub>2</sub> cathode material prepared at calcination temperature 930°C has a good layered structure, and the compacted density of the electrode sheet is above 3.68 g/cm<sup>3</sup>. The discharge capacity retention rate is more than 97.5% after 100 cycles at a charge-discharge rate of 1C, displaying a good cyclic performance.
文摘For the retaining wall and technologies to protect river levee, many patents were applied and numerous new technologies were developed according to the installation method and material. This study installed a magic retaining wall block, which was developed as new technology product to protect river levee from running water, in actual size experimental water channel and evaluated the hydraulic performance and the stability of technology based on the increase in the flow velocity and discharge by steps. This study divided the experiment into a total of six steps and conducted it accordingly. According to the experiment results, there was no deformation of the surface of the magic retaining wall block or any soil loss at the bottom either, under the condition of maximum flow velocity of 5.37 m/s (discharge of 7.40 m<sup>3</sup>/s). To analyze the occurrence of scour and the possibility of soil loss at the bottom of a structure due to a high flow velocity, this study conducted an image analysis of Case 6 under the condition of maximum discharge, using a drone. According to the results of an analysis through the drone, there was no soil loss or flow change due to a scour at the bottom of the magic retaining wall block. The results of this study will serve as references in designing a technology applying a magic retaining wall block, and present the methods and procedures to evaluate and verify the development of any further new technology.
