The practical application of energy-dense lithium(Li)metal batteries is severely hindered by the lack of suitable electrolytes.Weakening solvent coordination to enhance Li+kinetics has become a critical principle in e...The practical application of energy-dense lithium(Li)metal batteries is severely hindered by the lack of suitable electrolytes.Weakening solvent coordination to enhance Li+kinetics has become a critical principle in electrolyte design.Here,we propose an electrolyte design strategy that weakens Li^(+)-solvent coordination through the synergistic drag effects of dual diluents.Specifically,the-CF_(2)H group in ethyl 1,1,2,2-tetrafluoroethyl ether(ETE)forms hydrogen bonds with the oxygen atom in 1,2-dimethoxyethane(DME),while the electron-donating-N=and C_(2)H_(5)O-groups in ethoxy(pentafluoro)cyclotriphosphazene(PFPN)coordinate synergistically with Li^(+).The combined effects of hydrogen bonding between ETE and DME,along with the coordination of PFPN with Li^(+),weaken the Li^(+)-DME interaction and promote anion-enriched solvation structure,thereby facilitating Li^(+)desolvation process and forming an inorganic-rich solid-electrolyte interphase.In a Li metal battery with a 30μm ultrathin Li anode and high-loading LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)cathode(23.5 mg cm^(-2)),80% of capacity was achieved after 430 cycles at 4.3 V and 84% after 310 cycles at 4.5 V.Furthermore,a 331 mAh pouch cell achieved 148 cycles with 94.9% of capacity retention.展开更多
To address the issue of deteriorated PCB image quality in the quality inspection process due to insufficient or uneven lighting, we proposed an image enhancement fusion algorithm based on different color spaces. First...To address the issue of deteriorated PCB image quality in the quality inspection process due to insufficient or uneven lighting, we proposed an image enhancement fusion algorithm based on different color spaces. Firstly, an improved MSRCR method was employed for brightness enhancement of the original image. Next, the color space of the original image was transformed from RGB to HSV, followed by processing the S-channel image using bilateral filtering and contrast stretching algorithms. The V-channel image was subjected to brightness enhancement using adaptive Gamma and CLAHE algorithms. Subsequently, the processed image was transformed back to the RGB color space from HSV. Finally, the images processed by the two algorithms were fused to create a new RGB image, and color restoration was performed on the fused image. Comparative experiments with other methods indicated that the contrast of the image was optimized, texture features were more abundantly preserved, brightness levels were significantly improved, and color distortion was prevented effectively, thus enhancing the quality of low-lit PCB images.展开更多
From sport to business,success follows China’s Prince of Gymnastics People around the world gasped in awe when the final torchbearer at the opening ceremony of the Beijing Olympics lifted into the air
基金supported by the Fund of University of South China(201RGC013 and 200XQD052)the Youth Science Fund Project of Hunan Provincial Natural Science Foundation(2224SZ048)。
文摘The practical application of energy-dense lithium(Li)metal batteries is severely hindered by the lack of suitable electrolytes.Weakening solvent coordination to enhance Li+kinetics has become a critical principle in electrolyte design.Here,we propose an electrolyte design strategy that weakens Li^(+)-solvent coordination through the synergistic drag effects of dual diluents.Specifically,the-CF_(2)H group in ethyl 1,1,2,2-tetrafluoroethyl ether(ETE)forms hydrogen bonds with the oxygen atom in 1,2-dimethoxyethane(DME),while the electron-donating-N=and C_(2)H_(5)O-groups in ethoxy(pentafluoro)cyclotriphosphazene(PFPN)coordinate synergistically with Li^(+).The combined effects of hydrogen bonding between ETE and DME,along with the coordination of PFPN with Li^(+),weaken the Li^(+)-DME interaction and promote anion-enriched solvation structure,thereby facilitating Li^(+)desolvation process and forming an inorganic-rich solid-electrolyte interphase.In a Li metal battery with a 30μm ultrathin Li anode and high-loading LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2)cathode(23.5 mg cm^(-2)),80% of capacity was achieved after 430 cycles at 4.3 V and 84% after 310 cycles at 4.5 V.Furthermore,a 331 mAh pouch cell achieved 148 cycles with 94.9% of capacity retention.
文摘To address the issue of deteriorated PCB image quality in the quality inspection process due to insufficient or uneven lighting, we proposed an image enhancement fusion algorithm based on different color spaces. Firstly, an improved MSRCR method was employed for brightness enhancement of the original image. Next, the color space of the original image was transformed from RGB to HSV, followed by processing the S-channel image using bilateral filtering and contrast stretching algorithms. The V-channel image was subjected to brightness enhancement using adaptive Gamma and CLAHE algorithms. Subsequently, the processed image was transformed back to the RGB color space from HSV. Finally, the images processed by the two algorithms were fused to create a new RGB image, and color restoration was performed on the fused image. Comparative experiments with other methods indicated that the contrast of the image was optimized, texture features were more abundantly preserved, brightness levels were significantly improved, and color distortion was prevented effectively, thus enhancing the quality of low-lit PCB images.
文摘From sport to business,success follows China’s Prince of Gymnastics People around the world gasped in awe when the final torchbearer at the opening ceremony of the Beijing Olympics lifted into the air
