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首页> 外文期刊>New Journal of Chemistry >Influences of the molecular structure of carbon sources on the structure, morphology and performances of the Li3V2(PO4)3-C cathode for lithium ion batteries
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Influences of the molecular structure of carbon sources on the structure, morphology and performances of the Li3V2(PO4)3-C cathode for lithium ion batteries

机译：碳源的分子结构对锂离子电池Li3V2（PO4）3-C正极的结构，形态和性能的影响

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摘要

The influences of carbon sources in the synthesis of Li3V2(PO4)3-C (LVP) by carbothermal reduction method have been investigated. All the Li3V2(PO4)3-C samples possess the typical monoclinic structure. Of all the samples, LVP-PR (phenolic resin) possesses the largest discharge capacities of 128,4 mA h g~(-1), 125.7 mA h g~(-1) and 103.9 mA h g~(-1) at 0.2 C, 2 C and 5 C respectively. Its charge transfer resistance has the lowest value of 59.04 Ω. These excellent electrochemical performances result from its maximum conductivity of 1.93 x 10~(-2) S cm~(-1). The intensity ratio of peaks 1350 cm~(-1) to 1580 cm~(-1) in Raman spectra of LVP-PR has the lowest value of 1.162. The appearance of needle-shaped crystallites in LVP-PR and LVP-ER (epoxy resin) shows that phenolic resin and epoxy resin possess a strong reduction ability. This is also verified by the size of the crystallite. All these are because of the structural differences of carbon sources. The certain amount of benzene rings in the phenolic resin enables LVP-PR to possess high conductivity. The space steric effect of the methyl in epoxy resin and the lack of conjugated n bonds in glucose decrease the conductivity of LVP-ER and LVP-GL.
机译：研究了碳源对碳热还原法合成Li3V2（PO4）3-C（LVP）的影响。所有的Li3V2（PO4）3-C样品均具有典型的单斜晶结构。在所有样品中，LVP-PR（酚醛树脂）在0.2 C下的最大放电容量分别为128,4 mA hg〜（-1），125.7 mA hg〜（-1）和103.9 mA hg〜（-1），分别为2 C和5C。其电荷转移电阻的最小值为59.04Ω。这些优异的电化学性能是由于其最大电导率为1.93 x 10〜（-2）S cm〜（-1）。 LVP-PR的拉曼光谱中的1350 cm〜（-1）至1580 cm〜（-1）峰的强度比的最低值为1.162。 LVP-PR和LVP-ER（环氧树脂）中针状微晶的出现表明酚醛树脂和环氧树脂具有很强的还原能力。这也由微晶的尺寸证实。所有这些都是由于碳源的结构差异。酚醛树脂中一定量的苯环使LVP-PR具有高电导率。环氧树脂中甲基的空间位阻效应和葡萄糖中缺乏共轭n键会降低LVP-ER和LVP-GL的电导率。

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