TL81 97042667X光照相法测量高温气冷堆燃料微球包覆层厚度=Thickness measurement of coatings for HTGRcoated fuel particles[刊,中]/张纯,唐春和,张冬梅(清华大学.北京(100084))//清华大学学报·自然科学版.—1996,36(11).—75...TL81 97042667X光照相法测量高温气冷堆燃料微球包覆层厚度=Thickness measurement of coatings for HTGRcoated fuel particles[刊,中]/张纯,唐春和,张冬梅(清华大学.北京(100084))//清华大学学报·自然科学版.—1996,36(11).—75-79描述了用X射线照相法测量包覆层厚度的测量过程。采用光栅技术,用98J型精密测量投影仪对X光底片进行测量,用微机采集和处理数据。该测量方法的测量重现性好,对一选定的微球重复测量直径20次,标准偏差1 μm左右。该测量方法是无损检测,测量精度高,速度快,过程便于监督,适合于燃料微球生产过程中的在线测量。图2表4参3(李瑞琴)展开更多
LiNi1/3Co1/3Mn1/3O2 was coated with uniform nano-sized AlF3 layer by chemical precipitation method to improve its rate capability.The samples were characterized by X-ray diffractometry (XRD),transmission electron micr...LiNi1/3Co1/3Mn1/3O2 was coated with uniform nano-sized AlF3 layer by chemical precipitation method to improve its rate capability.The samples were characterized by X-ray diffractometry (XRD),transmission electron microscopy (TEM),energy dispersive spectroscopy (EDS),charge-discharge cycling,cyclic voltammetry (CV),and electrochemical impedance spectroscopy (EIS).Uniform coated layer with a thickness of about 3 nm was observed on the surface of LiNi1/3Co1/3Mn1/3O2 particle by TEM.At 0.5C and 2C rates,1.5% (mass fraction) AlF3-coated LiNi1/3Co1/3Mn1/3O2/Li in 2.8-4.3 V versus Li/Li+ after 80 cycles showed less than 3% of capacity fading,while those of the bare one were 16.5% and 45.9%,respectively.At 5C rate,the capacity retention of the coated sample after 50 cycles maintained 91.4% of the initial discharge capacity,while that of the bare one decreased to 52.6%.EIS result showed that a little change of charge transfer resistance of the coated sample resulting from uniform thin AlF3 layer was proposed as the main reason why its rate capability was improved obviously.CV result further indicated a greater reversibility for the electrode processes and better electrochemical performance of AlF3-coated layer.展开更多
文摘TL81 97042667X光照相法测量高温气冷堆燃料微球包覆层厚度=Thickness measurement of coatings for HTGRcoated fuel particles[刊,中]/张纯,唐春和,张冬梅(清华大学.北京(100084))//清华大学学报·自然科学版.—1996,36(11).—75-79描述了用X射线照相法测量包覆层厚度的测量过程。采用光栅技术,用98J型精密测量投影仪对X光底片进行测量,用微机采集和处理数据。该测量方法的测量重现性好,对一选定的微球重复测量直径20次,标准偏差1 μm左右。该测量方法是无损检测,测量精度高,速度快,过程便于监督,适合于燃料微球生产过程中的在线测量。图2表4参3(李瑞琴)
基金Project(50542004) supported by the National Natural Science Foundation of ChinaProject(1960-71131100017) supported by Graduate Degree Thesis Innovation Foundation of Central South University,China
文摘LiNi1/3Co1/3Mn1/3O2 was coated with uniform nano-sized AlF3 layer by chemical precipitation method to improve its rate capability.The samples were characterized by X-ray diffractometry (XRD),transmission electron microscopy (TEM),energy dispersive spectroscopy (EDS),charge-discharge cycling,cyclic voltammetry (CV),and electrochemical impedance spectroscopy (EIS).Uniform coated layer with a thickness of about 3 nm was observed on the surface of LiNi1/3Co1/3Mn1/3O2 particle by TEM.At 0.5C and 2C rates,1.5% (mass fraction) AlF3-coated LiNi1/3Co1/3Mn1/3O2/Li in 2.8-4.3 V versus Li/Li+ after 80 cycles showed less than 3% of capacity fading,while those of the bare one were 16.5% and 45.9%,respectively.At 5C rate,the capacity retention of the coated sample after 50 cycles maintained 91.4% of the initial discharge capacity,while that of the bare one decreased to 52.6%.EIS result showed that a little change of charge transfer resistance of the coated sample resulting from uniform thin AlF3 layer was proposed as the main reason why its rate capability was improved obviously.CV result further indicated a greater reversibility for the electrode processes and better electrochemical performance of AlF3-coated layer.
