Deposition of CN_(x) thin films on Si(111)has been performed by laser ablation of graphite under a low-energy nitrogen ion beam bombardment.Films with a maximum N-concentration of 34%are obtained.The N species is foun...Deposition of CN_(x) thin films on Si(111)has been performed by laser ablation of graphite under a low-energy nitrogen ion beam bombardment.Films with a maximum N-concentration of 34%are obtained.The N species is found to be relatively constant along the depth of films.X-ray spectroscopy data confirm the existence of covalent C-N bonds.Nanocrystallites structure has been detected in the amorphous matrix of the films.Qualitative hardness tests indicate that the films are relatively hard and adhesive.展开更多
The rate performance of lithium manganese phosphate is seriously tarnished by its sluggish surface kinetics,which could be addressed by LiFePO4-surface coating.For a higher energy output,here we explore thinner coatin...The rate performance of lithium manganese phosphate is seriously tarnished by its sluggish surface kinetics,which could be addressed by LiFePO4-surface coating.For a higher energy output,here we explore thinner coating layers with 10%and 5%LiFePO4 via the lab-developed DMSO assisted method.The core-shell structured 0.9LiMnPO4-0.1LiFePO4/C maintains a high specific capacity,153,148 and 140 mA hg-1 under 0.1,1 and 5 C respectively,which are the best results for this composition till date.As for 0.95Li MnPO4-0.05 LiFePO4/C,the discharge capacity is lower than 110 mA hg-1 even in 0.1 C,which cannot meet the requirements of practical application.Our approaches push the manganese ratio of LiMnPO4-based composite to 90%from 80%,further improving the energy-density of the olivine phosphates.展开更多
文摘Deposition of CN_(x) thin films on Si(111)has been performed by laser ablation of graphite under a low-energy nitrogen ion beam bombardment.Films with a maximum N-concentration of 34%are obtained.The N species is found to be relatively constant along the depth of films.X-ray spectroscopy data confirm the existence of covalent C-N bonds.Nanocrystallites structure has been detected in the amorphous matrix of the films.Qualitative hardness tests indicate that the films are relatively hard and adhesive.
基金supported by the National Natural Science Foundation of China(Grant No.51572273)the National Key R&D Program of China(Grant No.2018YFB0905400)the Ningbo S&T Innovation 2025 Major Special Programme(Grant No.2018B10061)。
文摘The rate performance of lithium manganese phosphate is seriously tarnished by its sluggish surface kinetics,which could be addressed by LiFePO4-surface coating.For a higher energy output,here we explore thinner coating layers with 10%and 5%LiFePO4 via the lab-developed DMSO assisted method.The core-shell structured 0.9LiMnPO4-0.1LiFePO4/C maintains a high specific capacity,153,148 and 140 mA hg-1 under 0.1,1 and 5 C respectively,which are the best results for this composition till date.As for 0.95Li MnPO4-0.05 LiFePO4/C,the discharge capacity is lower than 110 mA hg-1 even in 0.1 C,which cannot meet the requirements of practical application.Our approaches push the manganese ratio of LiMnPO4-based composite to 90%from 80%,further improving the energy-density of the olivine phosphates.
