中热固相法Li1+xV3O8-yFy正极材料的制备及性能     

秦红莲  唐致远  马莉 《中国科学院研究生院学报》2011,28(4)

以Li2CO3和V2O5为原料,用中热固相法制备了掺杂不同氟离子含量的锂离子电池正极材料Li1+xV3O8-yFy,采用XRD衍射对其结构进行表征,并通过充放电测试、循环伏安及电导率测试对其性能进行了研究.测试结果表明,中热固相法制得的Li1+xV3O8-yFy产品较纯,没有杂质相存在;当y=0.1时产品的电化学循环性能最好,首次放电比容量达252.08 mAh/g,以0.2c倍率循环25次之后比容量仍保持在210.93 mAh/g,容量保持率达92.72％.  相似文献   

中热固相法Li_1+x V₃ O_8-y F_y 正极材料的制备及性能     

秦红莲  唐致远  马莉 《中国科学院大学学报》2011,28(4):457-461

以Li₂CO₃和V₂O₅为原料,用中热固相法制备了掺杂不同氟离子含量的锂离子电池正极材料Li_1+xV₃O_8-yF_y,采用XRD衍射对其结构进行表征,并通过充放电测试、循环伏安及电导率测试对其性能进行了研究.测试结果表明,中热固相法制得的Li_1+xV₃O_8-yF_y产品较纯,没有杂质相存在;当y = 0.1时产品的电化学循环性能最好,首次放电比容量达252.08 mAh/g,以0.2c倍率循环25次之后比容量仍保持在210.93 mAh/g,容量保持率达92.72%.  相似文献   

Electroless Co-Zn Surface-Modified Nickel Hydroxide as an Active Material for Pasted Nickel Electrodes     

宋全生  唐致远  郭鹤桐  CHAN S L I 《天津大学学报(英文版)》2004,10(1)

Rechargeablealkalinenickelbatteries (e.g.,Ni/Cd ,Ni/Fe,Ni/Zn,Ni/H2 andNi/MH)areusuallypos itivelimited ,sothatthecapacityandcyclelifeofthecellsaredeterminedmainlybytheperformancesofnickelelectrodes.Withtheirhighenergydensityandlowcostrelativetothatofconventionalsinterednickelelectrodes,pastednickelelectrodeshavenowbeenwidelyusedincommerciallyavailableNi/MHbatteries[1 ,2 ] .Asthedis charged stateactivematerialofthepastednickelelec trodes,thepropertyofsphericalnickelhydroxideisthekeytodeter…  相似文献   

Electroless Co-Zn Surface-Modified Nickel Hydroxide as an Active Matedrial for Pasted Nickel Electrodes     

宋全生唐致远  郭鹤桐CHANSLI 《天津大学学报(英文版)》2004,10(1):47-53

Chemically precipitated β-type nickel hydroxide powder was surface-modified by electroless deposition of Co-Zn coatings,and physical properties of both the modified and unmodified nickel hydroxide were characterized by scanning electron microscopy (SEM), specific surface area (BET), X-ray diffraction (XRD) and Xray photoelectron spectroscopy (XPS). It has been found that Co and Zn components of the surface electroless coatings exist in the oxidized state. Electrochemical performances of pasted nickel electrodes using the modified nickel hydroxide as an active material were investigated, and compared with those of the electrodes prepared with the unmodified nickel hydroxide. Charge/discharge tests show that the modified nickel hydroxide electrodes exhibit better performances in the charge efficiency, specific discharge capacity and active material utilization.Their resistance to swelling with cycling is also superior to that of the unmodified nickel hydroxide electrodes.Cyclic voltammetric (CV) studies indicate that the modified electrodes have a higher electrochemical activity,and the porous pasted nickel electrodes have some distinguished CV characteristics in comparison with those of the thin film nickel electrodes.  相似文献   

Natural and Treated FeS2 in Li/FeS2 Coin Cell   总被引：1，自引：0，他引：1  

唐致远 崔燕薛建军  南俊民侯宪鲁 杨敏杰 《天津大学学报(英文版)》2006,12(1):42-45

TREATED FES, SAMPLES WERE PREPARED BY NATURAL FES, SAMPLES WHICH WERE GROUND FIRST, HEATED IN NITROGEN AND THEN WASHED IN ACID. THE LEVELS OF IMPURITY ELEMENTS, PRIMARILY PRESENT AS METALLIC OXIDES AND SULFIDES, ARE HIGHER IN THE NATURAL FES, THAN THOSE IN THE TREATED SAMPLE. SCANNING ELECTRON MICROSCOPY SHOWS THAT THE GRAIN SIZES OF TREATED FES, PARTICLES ARE SMALLER THAN THOSE OF NATURAL FES, PARTICLES. THE ELECTROCHEMICAL PERFORMANCE OF LI/TREATED FES, CELLS IS ATTRIBUTED TO THE SMALLER GRAIN SIZES AND HIGHER PURITY OF TREATED FES, PARTICLES IN COMPARISON TO THE NATURAL FES, SAMPLE.  相似文献