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本文采用固相法制备了纯相LiMn1-xFexPO4/C (x=0.2,0.4,0.6)正极材料,并用X射线衍射(XRD)和扫描电镜(SEM)进行表征,用高精度电池测试系统进行充放电和循环伏安测试.结果表明不同Mn和Fe原子比的电极材料具有很大的性能差异,其中当x=0.4时,材料具有优异的循环稳定性和较高的可逆容量.首次充电容量和放电容量分别达到141.5 mAh/g和125.7 mAh
关键词:
锂离子电池
固相法
1-xFexPO4')" href="#">LiMn1-xFexPO4
正极材料 相似文献
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我们从天坛株痘苗病毒的基因组中,分离编码11K及25K蛋白的双向转录启动子,以胸苦激酶(TK)基因为旁侧序列,插入到质粒pAT153中,构建成可以同时表达两个外源基因的载体质粒,并将乙型肝炎病毒表面抗原(HBsAg)基因及大肠杆菌的β-半乳糖苦酶(LacZ)基因,插入该载体质粒,使它们分别在11K及25K启动子钠控制下,构建成共表达质粒。用钙沉淀法将此质粒DNA同天坛株痘苗病毒在细胞内进行同源重组,在含X-gal的培养基挑蓝色蚀斑,简便、准确地选出重组痘苗病毒。所选到的重组痘苗病毒高效表达了HBsAg。我们还把上述重组痘苗病毒接种动物,观察了它们的毒力及免疫原性。 相似文献
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采用第一性原理超软赝势平面波方法计算了Sn3InSb4的嵌Li性能,得到各种嵌Li相的嵌Li形成能、理论质量比容量、体积膨胀率、能带结构、态密度和差分电荷密度等.从能量角度分析,Li在嵌入时,优先占据晶胞的四面体间隙位置,然后逐步挤出处于节点位置的Sn原子和In原子.在嵌Li过程中,材料表现出较大的体积膨胀率(11.74%-43.40%),这是导致Sn3InSb4作为Li离子电极材料循环性能差的重要原因.态密度计算表明,体系的导电性能首先随嵌Li量的增加而增加,当所有的间隙位置被Li填满,发生Sn的替换反应时,富Li态合金相的导电性反而下降. 相似文献
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We constructed a plasmid that contains a small piece of DNA with two vaccinis promoters running in opposite directions——a promoter from a late gene encoding an 11 K polypeptide (P11) and a promoter from an early gene encoding 25K(P25). These promoters were isolated from the Tian Tan strain of vaccinia virus and were flanked by the thymidine kinase (TK) sequence of the same virus. Genes encoding the hepatitis B virus surface antigen (HBsAg) and the Rscherichia coli β-galactosidase (LacZ) were inserted downstream of the 11 K and 25 K promoters respectively so that coexpression plasmids were constructed. Recombinant vaccinis Viruses were selected directly by picking blue plaques formed under overlaying agarose medium containing X-gal. HBsAg was expressed to high level by these recombinant viruses. These recombinant viruses showed reduced virulence on rabbit skin and induced anti-HBs after intrsdermal inoculation of rabbits. 相似文献
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