The capacity fade of spinel lithium manganese oxide in lithium-ion batteries is a bottleneck challenge for the large-scale application.The traditional opinion is that Mn（Ⅱ） ions in the anode are reduced to the meta...The capacity fade of spinel lithium manganese oxide in lithium-ion batteries is a bottleneck challenge for the large-scale application.The traditional opinion is that Mn（Ⅱ） ions in the anode are reduced to the metallic manganese that helps for catalyzing electrolyte decomposition.This could poison and damage the solid electrolyte interface（SEI） film,leading to the the capacity fade in Li-ion batteries.We propose a new mechanism that Mn（Ⅱ） deposites at the anode hinders and/or blocks the intercalation/de-intercalation of lithium ions,which leads to the capacity fade in Li-ion batteries.Based on the new mechanism assumption,a kind of new structure with core-shell characteristic is designed to inhabit manganese ion dissolution,thus improving electrochemical cycle performance of the cell.By the way,this mechanism hypothesis is also supported by the results of these experiments.The LiMn2-xTixO4 shell layer enhances cathode resistance to corrosion attack and effectively suppresses dissolution of Mn,then improves battery cycle performance with LiMn_2O_4 cathode,even at high rate and elevated temperature.展开更多
目的对比三孔法腹腔镜胆囊切除手术过程中,使用5 mm Trocar或10 mm Trocar作为主操作孔切除胆囊时,两种方式手术应用上的优势和不足,从而提高患者的治疗质量。方法收集十堰市太和医院肝胆胰外科诊疗中心2021年6月至2022年6月期间,由同...目的对比三孔法腹腔镜胆囊切除手术过程中,使用5 mm Trocar或10 mm Trocar作为主操作孔切除胆囊时,两种方式手术应用上的优势和不足,从而提高患者的治疗质量。方法收集十堰市太和医院肝胆胰外科诊疗中心2021年6月至2022年6月期间,由同一诊疗组收治的胆囊良性疾病患者共100例,其中50例使用5 mm Trocar作为主操作孔行腹腔镜胆囊切除术,设为实验组;50例使用10 mm Trocar作为主操作孔,设为对照组。分别对比实验组和对照组手术时间、术中出血量、术后胃肠道恢复情况、术后疼痛情况、术后住院时间、住院费用的差异,并进行统计学分析。结果两种腹腔镜胆囊切除术均可顺利完成。患者手术时间、术中出血量、术后胃肠道恢复情况、术后住院时间、住院费用比较,差异均无统计学意义(P>0.05)。实验组患者主操作孔伤口术后疼痛程度相较于对照组较低,且切口较小利于美容缝合,术后伤口更美观。结论三孔法腹腔镜胆囊切除手术过程中,使用5 mm Trocar作为主操作孔优于10 mm Trocar作为主操作孔,手术质量更高,有益于患者,此种术式值得推广。展开更多
基金Funded by the National Natural Science Foundation of China(Nos.21561016,21661015)Jiangxi Provincial Science&Technology Program(Nos.20133BBE50010,20142BDH80020,and 20161BBE50052)Science&Technology Program of Jiangxi Provincial Education Bureau(No.GJJ150775)
文摘The capacity fade of spinel lithium manganese oxide in lithium-ion batteries is a bottleneck challenge for the large-scale application.The traditional opinion is that Mn（Ⅱ） ions in the anode are reduced to the metallic manganese that helps for catalyzing electrolyte decomposition.This could poison and damage the solid electrolyte interface（SEI） film,leading to the the capacity fade in Li-ion batteries.We propose a new mechanism that Mn（Ⅱ） deposites at the anode hinders and/or blocks the intercalation/de-intercalation of lithium ions,which leads to the capacity fade in Li-ion batteries.Based on the new mechanism assumption,a kind of new structure with core-shell characteristic is designed to inhabit manganese ion dissolution,thus improving electrochemical cycle performance of the cell.By the way,this mechanism hypothesis is also supported by the results of these experiments.The LiMn2-xTixO4 shell layer enhances cathode resistance to corrosion attack and effectively suppresses dissolution of Mn,then improves battery cycle performance with LiMn_2O_4 cathode,even at high rate and elevated temperature.
文摘目的对比三孔法腹腔镜胆囊切除手术过程中,使用5 mm Trocar或10 mm Trocar作为主操作孔切除胆囊时,两种方式手术应用上的优势和不足,从而提高患者的治疗质量。方法收集十堰市太和医院肝胆胰外科诊疗中心2021年6月至2022年6月期间,由同一诊疗组收治的胆囊良性疾病患者共100例,其中50例使用5 mm Trocar作为主操作孔行腹腔镜胆囊切除术,设为实验组;50例使用10 mm Trocar作为主操作孔,设为对照组。分别对比实验组和对照组手术时间、术中出血量、术后胃肠道恢复情况、术后疼痛情况、术后住院时间、住院费用的差异,并进行统计学分析。结果两种腹腔镜胆囊切除术均可顺利完成。患者手术时间、术中出血量、术后胃肠道恢复情况、术后住院时间、住院费用比较,差异均无统计学意义(P>0.05)。实验组患者主操作孔伤口术后疼痛程度相较于对照组较低,且切口较小利于美容缝合,术后伤口更美观。结论三孔法腹腔镜胆囊切除手术过程中,使用5 mm Trocar作为主操作孔优于10 mm Trocar作为主操作孔,手术质量更高,有益于患者,此种术式值得推广。
