average valence 平均价态(18)   平均价态     The average valence of Mn was decreased by F substitution, accordingly, the amount of Mn3+ were increased, therefore, the initial capacity was elevated and sample c (LiMn2O3.5F0.5) had the highest capacity (127mAh/g). Despite of the elevated initial capacity, the single F substitution deteriorated the cyclability.     F掺杂降低了Mn的平均价态，提高了Mn~(3+)的含量，也相应提高了材料的初始容量，并且掺量为0.5mol的试样初始容量达127mAh／g，但是单纯阴离子掺杂不利于材料的循环性能。 短句来源     XPS spectra showed the average valence of nickel decreased from +3 to +2 with Ni content in LiNixMn2-xO4. However, the average valence of manganese increased from +3 to +4. The decreasing of Mn3+ ions amount can limit the Jahn-Teller distortion of [MnO6] octahedron.     XPS分析发现，随着Ni固溶量的增加，材料中Ni的平均价态由+3价逐渐向+2价过渡，而Mn的平均价态则由+3价逐渐向+4价过渡。 平均价态由3.46提高到3.62，这表明Ni的掺杂有利于抑制材料中的Jahn-Teller畸变，增强晶体结构的稳定性。 短句来源     From the Raman spectra of LiNixMn2-xO4, we found that the intensity of the shoulder peaks near 590 cm-1 became stronger with nickel doping, which confirms the increase of the average valence of Mn in LiNixMn2-xO4. The frequency of Raman vibrations in LiNixMn2-xO4 increased because the covalent interaction ofNi-O is larger than that of Mn-O, indicating a stronger stability of the [MnO6] octahedron framework.     Raman和FTIR光谱分析表明，随着Ni的掺杂，Mn4+离子在LiNixMn2-xO4体系中的含量增多，此时F2g（1）振动的强度逐渐增强，可见LiNixMn2-xO4的Raman光谱也对材料中Mn的平均价态的变化给予了实验证明。 同时随Ni的加入，LiNixMn2-xO4的A1g振动的Raman强度逐渐增强，并向高波数端移动。 短句来源     The results show that the contents of Mn2+, Mn3+ and Mn4+ of the samples synthesized at different conditions are different and as a result there are different average valence of manganese.     研究发现,不同工艺条件下合成的样品中,Mn2+、Mn3+和Mn4+含量不同,所得到的Mn的平均价态也不同。 短句来源     Using the band theory,we have calculated the average valence states of Co and O.     从能带计算出发 ,进一步定量给出了Co和O的平均价态的变化 . 短句来源   “average valence”译为未确定词的双语例句     The (220) diffraction peak of spinel crystal appeared for LiNi0.4Mn1.6O4, which indicated partial occupation of the 8a sites by nickel atoms in the heavy doped LiNi0.4Mn1.6O4.The average valence of nickel and manganese ions and the ratio of Mn3+/Mn4+ can be studied by XPS.     此外，在LiNi0.4Mn1.6O4的XRD谱中出现了尖晶石结构的(220)衍射峰，表明部分Ni占据了尖晶石结构中Li的8a位置。 我们采用X射线光电子能谱分析(XPS)方法研究了Ni加入对LiNixMn2-xO4中Ni和Mn两种离子的价态及Mn3+/Mn4+离子含量变化规律。 短句来源 查询“average valence”译词为用户自定义的双语例句     我想查看译文中含有：的双语例句 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。   average valence X-ray absorption near-edge structure (XANES) analysis showed that the average valence of Cr in Sr3Cr2O8 is +5.2, suggesting the presence of mixed valence states in this compound. 例句来源       The change in superconducting properties may be the result of a change in Cu average valence state. 例句来源       These were attributed to the variation of the average valence of Mn ions. 例句来源       The results indicated that Mn2+ is stably present in the La1-xMnO3-δ having an average valence number exceeding 3.0. 例句来源       The average valence state of manganese, determined by iodometry, was approximately 3.2, and decreased by 1 as the lanthanum vacancy increased by 1. 例句来源       更多                    The structure and the electrochemical performances of Co, Cr, Ni, Cu, Al doped spinel lithium manganese oxides in the 4 V range are introduced. Compared with pure spinel LiMn 2O 4, the doped oxides still have spinel structure. With increasing dopant content, their lattice constants and cell volume decrease, average valence of Mn increases, and initial specific capacity in 4 V range decreases. The doped oxides have better cyclability. The mechanisms of performance change in doped spinel LiMn ...             介绍了Co、Cr、Ni、Cu、Al 5种金属元素的掺杂对尖晶石LiMn2 O4 的结构和 4V区电化学性质的影响 :探讨了掺杂元素增加尖晶石锂锰氧化物 4V区循环稳定性的机理 ;减少了尖晶石在电解液中的溶解量 ;抑制了John Teller效应的发生 ;增加了键强度 ,使得尖晶石结构更加牢固。讨论了掺杂对尖晶石高电位 (>4 5V)区容量的影响 :掺杂后的尖晶石锂锰氧化物仍保持尖晶石结构 ,但与未掺杂的尖晶石锂锰氧化物相比 ,它的晶胞常数减小 ,晶胞体积收缩 ;锰元素的平均化合价升高 ;4V区的初始容量减小 ;循环稳定性明显增加。除Al外 ,Co、Cr、Ni、Cu掺杂后的尖晶石锂锰氧化物均在高电位区有一定的放电容量 ,且随掺杂量的增加而增加。 文摘来源          Electronic structures of Li(Co,Al)O 2 and Mg-doped Li(Co,Al)O 2 were studied theoretically via ab initio calculation based on density-functional theory. Studies of band structures and density of states show that hole states appear in the valence bands of the Mg-doped material as well as an increase in bandwidth,which are in charge of the increase in the observed electronic conductivity. It was found by analysis of Co3d density of states that the divalence Mg doping induces a higher cobalt val...             基于密度泛函理论的第一原理赝势法 ,研究了Mg在Li(Co ,Al)O2 中掺杂前后的电子结构的变化 .通过能带和态密度的分析 ,发现Mg掺杂后在价带中引入了电子空穴 ,同时价带展宽 ,这两个电子结构的显著变化是引起Li(Co ,Al)O2 导电率提高的主要机理 .通过对Co3d电子态密度的分析发现 ,在二价Mg掺杂后 ,Li(Co ,Al)O2 中的Co价态升高 ,介于Co3+和Co4 +之间 .从能带计算出发 ,进一步定量给出了Co和O的平均价态的变化 . 文摘来源          The spinel Lithium manganese oxide was synthesized with solid reaction method. Synthesized atmosphere, synthesized temperature, heating time and ratio of the raw material were investigated. The content of the different manganese valence of the samples was determined by titration analysis. The results show that the contents of Mn2+, Mn3+ and Mn4+ of the samples synthesized at different conditions are different and as a result there are different average valence of manganese. The electrochem...             采用固相法合成了锂锰氧化物。考察了合成气氛、合成温度、恒温时间以及原料配比因素的影响,采用滴定分析的方法测定了不同工艺条件下合成样品中锰的不同价态的含量。研究发现,不同工艺条件下合成的样品中,Mn2+、Mn3+和Mn4+含量不同,所得到的Mn的平均价态也不同。电化学性能测试表明,在优化工艺条件下所合成的样品,首次放电容量为120.5mAh·g-1,第5次放电容量保持在114.6mAh·g-1,容量保持率为95.1%,表现出良好的电化学性能。 文摘来源       相关查询: average valence number atomic average valence average manganese valence average bond valence average valence of manganese average valence connectivity index (average average) (valence average valence of vanadium the average valence number average  对查询结果不满意

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