磁场和Fe^3＋对铁在0.5mol／LH2SO4中阴极极化行为的影响

用动电位扫描法研究了有无外磁场时纯铁在Ｆｅ２（ＳＯ４）３和Ｈ２ＳＯ４＋Ｆｅ２（ＳＯ４）３溶液中的阴极极化曲线，没有外加磁场时，Ｆｅ＾３＋还原反应与Ｈ＾＋去极化反应有相互促进作用，在单纯Ｈ２ＳＯ４溶液或单纯Ｆｅ２（ＳＯ４）３溶液中，外加０．４Ｔ磁场均加速铁的阴极过程，但不改变反应进行的机制；在Ｈ２ＳＯ４＋Ｆｅ２（ＳＯ４）３溶液中磁场对铁阴极过程的加速作用是磁场对Ｆｅ＾３＋还原和对氢离子去极化反应作用     

钠和电解质对阴极炭块及TiB2镀层的渗透

把无烟煤阴极炭块和由电沉积得到的TiB2镀层作为阴极，在工业铝电解的条件下电解4小时，考察钠和电解质对它们的渗透腐蚀。实验结果表明：由酚酞试剂的检测钠对阴极炭块的渗透深度达到16mm,对TiB2镀层的渗透深度为零；钠和电解质主要渗透到阴极炭块的孔隙，钠比电解质渗透的深。由扫描电镜的分析结果表明：Na和F元素渗透到石墨基体的量很少，元素铝相对较多，TiB2镀层阻碍了钠的产生并减缓了钠的渗透，但没有改变钠的渗透机理。同时，镀层与基体的结合力是很好的，铝对TiB2镀层的湿润性很好。     

High-rate capability of spinel LiNi0.05Mn1.95O4 cathode for Li-ion batteries prepared via coprecipitated precursor

Spinel LiNi0.05Mn1.95O4 cathode material for lithium ion batteries was synthesized by solid-state reaction from coprecipitated Ni-Mn hydroxide precursors and characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM） and galvanostatic charge-discharge tests. It is found that LiNi0.05Mn1.95O4 powder has an ordered cubic spinel phase （space group Fd3m） and exhibits superior rate capability. After 450 cycles, the LiNi0.05Mn1.95O4/carbonaceous mesophase spheres（CMS） Li-ion batteries can retain 96.0% and 93.3% capacity at 5C and 10C charge/discharge rate, respectively, compared with 85.3% （5C） and 80.5% （10C） retention for LiMn204 batteries. However, the initial discharge capacity of LiNi0.05Mn1.95O4/CMS batteries at 1C charge/discharge rate （96.20 mA.h/g） is slightly lower than that of the LiMn2O4 batteries （100.98 mA.h/g） due to the increased average oxidation state of Mn inLiNi0.05Mn1.95O4.     

阴极电泳涂料进展

纵观阴极电泳涂装的发展史,在综述阳离子型树脂的合成方法和阴极电泳涂料的基本组成之后,指出今后阴极电泳涂料将向中厚膜、厚膜、高光泽、高充填性、高平整性、高边棱覆盖及低温固化等方向发展。     

Preparation and electrochemical properties of LiMn1.95M0.05O4 （M=Cr, Ni）

The preparation process and electrochemical properties of LiMn2O4 and LiMnl.95M0.05O4 （M = Cr, Ni） were studied. The results show that the decomposition temperature range of xerogel prepared with lithium acetate and manganese acetate as raw rnaterials is large and the decomposition speed is slow. Oxygen consumed is apt to get a prompt supplement during the preparation of LiMn2O4, and carbonization of the organic matter can be reduced or avoided, which is favorable to the combination of lithium and manganese. Using lithium acetate, manganese acetate, chromium nitrate, and nickel nitrate as raw materials and adopting the citric acid complexing method, it has been found that the prepared powders have high purity, high quality stability, and even doping characters. With the increase of sintering temperature, the particle size and crystal lattice constant of LiMn1.95M0.05O4 （M = Cr, Ni） enhance. However, the purity of the product is relatively high and has no obvious change, which is advantageous to the control of the quality of LiMn1.95M0.0504 （M = Cr, Ni）. Doping with a small amount of Cr3. and Ni^2＋ can stabilize the spinel structure of LiMn2O4, suppress the Jahn-Teller effect, and improve the cycling properties but reduce the initial capacity.     

Electrical properties of La0.6Sr0.4Co1-yFeyO3 cathode material

The electrical properties of La0.6Sr0.4Co1-yFeyO3 （LSCF, y=0-1.0） cathode materials were measured by DC four probes, X-ray photo-electron spectrum （XPS） was also introduced to determine the chemical state of Co, F.e ions in LSCF. It is found that the electrical conductivity of each sample has a maximum value with increasing temperature. XPS analysis shows that Co ion has three different chemical states, corresponding to two with Fe ion. The analyses indicates that the small-polaron hopping mechanism dominates the electron conduction at low temperature, while at high temperature, the three factors such as the thermally activated disproportionation of Co^3＋ ions into Co^2＋ and Co^4＋ pairs, the ionic compensation of oxygen vacancies formed at high temperatures, and Fe^4＋ ions charge compensation preferential to Co^4＋, all contribute to electrical conduction.     

Synthesis and characterization of LiNi0.45Co0.10Mn0.45O2 cathode for lithium ion batteries

1INTRODUCTIONAdvanced rechargeable lithium ion batteriesare attractive for use in consumer electronic andelectric vehicle(EV)application because of a fa-vorable combination of voltage,energy density,cycling performance,and have been developed rap-idly worldwide during the past decade[1,2].LiCoO2has been widely used as a cathode material in com-mercial lithiumion battery because it is reasonableeasy to synthesize and shows a stable discharge ca-pacity[3].But due to its high cost and toxic…     

钪系阴极基体的研究

采用氧化钪与钨机械混合、氧化钨与钪盐水溶液固液掺杂法制备了氧化钪-钨基体，采用扫描电镜及原位俄歇电子能谱方法研究了基体中钪的分布及阴极基体的抗离子轰击性能。结果表明，采用液固法制备的烧结体，氧化钪分布均匀，这样的结构有利于钪的扩散和补充，原位俄歇轰击实验结果表明，阴极基体具有良好的耐高温和耐离子轰击性。     

La0.7Sr0.3Cu1-xFexO3-δ系阴极材料的制备与性能研究

采用固相法和EDTA-柠檬酸联合络合法制备了中温固体氧化物燃料电池La0.7Sr0.3Cu1-xFexO3-δ阴极材料,利用直流四探针和交流阻抗技术测试了材料的导电性能和电化学性能,结果表明加入Fe后材料的电导率有所降低,但在高温下仍然具有较高的电导率(＞100 S·cm-1).EDTA-柠檬酸联合络合法制备的试样比固相法合成的具有更高的电导率(在800℃时,EDTA-柠檬酸联合络合法制备的试样电导率为255 S·cm-1,而固相法的为156 S·cm-1).700℃时的复阻抗测试结果表明Fe的加入降低了La0.7Sr0.3CuO3-δ的极化电阻,其中La0.7Sr0.3Cu0.4Fe0.6O3-δ的极化电阻最小,为2.51 Ω·cm2.     

月桂酸钠对LY12铝合金的缓蚀作用

本文通过电化学方法研究了月桂酸钠对硬铝合金（LY12CZ）在3．5％NaCl溶液中的缓蚀作用。实验结果表明，月桂酸钠对铝合金具有较好的腐蚀作用，随着月桂酸钠浓度的增大缓蚀效率增大，达到一个最大值后又有所降低。并讨论了月桂酸钠对铝合金阳极反应和阴极反应的作用系数。月桂酸钠抑制铝合金阳极反应大于抑制阴极反应。