排序方式: 共有3条查询结果,搜索用时 125 毫秒
1
1.
Two ferrates, K2FeO4 and BaFeO4, had been prepared and characterized by XRD, IR and SEM. The electrochemical tests of the samples were carried out in the voltage range of 0.8~2.0 V and current density of 0.5~3.0 mA·cm-2. The results indicated that performance of Zn-BaFeO4 battery was superior to that of Zn-MnO2 and Zn-K2FeO4 batteries. Nanometer SrTiO3 prepared by Sol-gel methode with different ratio was added to the BaFeO4 cathode in order to improve the discharge performance. The discharge capacity of the BaFeO4 cathode was increased from 224 mAh·g-1 to 246 mAh·g-1 by addition of 5% nanometer SrTiO3. The reason of enhancing BaFeO4 electrochemical performance was discussed. 相似文献
2.
层状LiCoO2作为锂离子二次电池电极正极材料已得到广泛应用。由于钴资源匮乏及成本高,致使进一步提高比容量和比能量以及降低成本的研究引起关注。诸如LiCoO2体材中钴被M(N i,Mn,Ti,Mg)替代或部分被替代的研究[1-3],表面修饰研究[4-6],合成方法研究如固相法[7],溶胶凝胶法[8],共沉淀法[9],微波加热合成法[10]等。与钴相比,镍资源相对丰富且对环境友好,故以镍代钴合成LiCo1-xN ixO2的研究成为热点[11-13]。由于N i2 难以被氧化成N i3 致使合成时易生成非化学计量化合物,加之在充放电过程中,由于Li 离子与N i3 离子半径相近易产生阳离… 相似文献
3.
层状LiCo1/3Ni1/3Mn1/3O2正极材料的合成及电化学性能研究 总被引:13,自引:0,他引:13
采用液相法在800 ℃空气中烧结20 h合成出层状LiCo1/3Ni1/3Mn1/3O2正极材料。通过XRD、IR、SEM、XPS和电化学性能测试考察了产物的组成、结构、形貌及电化学性能。结果表明,所合成的LiCo1/3Ni1/3Mn1/3O2为六方单相,层状结构发育完善;产物呈球形且粒度小,分布窄,平均粒径为0.3 μm。以1 mA·cm-2的电流密度,在2.7~4.3 V区间进行充放电测试,前4周的充放电比容量分别为168/160 mAh·g-1、169/162 mAh·g-1、165/160 mAh·g-1、163/158 mAh·g-1,循环性能优良。循环伏安实验表明,该材料在3.9 V附近出现了一对对称性好的氧化还原峰。 相似文献
1