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首页> 外文会议>8th Asian Conference on Solid State Ionics: Trends in the New Millennium; Dec 15-19, 2002; Langkawi, Malaysia >STRUCTURE AND ELECTROCHEMISTRY OF 4-V POSITIVE ELECTRODES PREPARED BY SUCCINIC ACID-ASSISTED WET CHEMISTRY
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STRUCTURE AND ELECTROCHEMISTRY OF 4-V POSITIVE ELECTRODES PREPARED BY SUCCINIC ACID-ASSISTED WET CHEMISTRY

机译：蔗糖酸辅助湿化学法制备的4-V正电极的结构和电化学

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The Li-Me-O materials were synthesized by the wet-chemistry technique using aqueous solutions of metal acetates and succinic acid as a chelating agent. Samples included: LiMn_2O_4, LiMn_(1.8)Co_(0.2)O_4, LiMn_(1.8)Cr_(0.1)Cu_(0.1)O_4, LiCoO_2, LiCo_(0.7)Ni_(0.3)O_2, LiCo_(0.7)Cr_(0.3)O_2, and LiCo_(0.7)Al_(0.3)O_2. The structural properties of products were studied by X-ray powder diffractometry and FTIR spectroscopy. To compare the rechargeable capacity of Li-Me-O cells, the electrochemical characteristics of the 4-volt oxides were evaluated as positive electrode materials in cells using Li-metal as negative electrode. The structural properties of LiMn_(1.8)Cr_(0.1)Cu_(0.1)O_4 are very similar to that of LiMn_2O_4, while their electrochemical performances show that the capacity is maintained 95% of the initial value at the 36th cycle, this being explained by the change of Mn~(3+)/Mn~(4+) ratio in doped spinel phases. The layered lattices of LiCo_(0.7)Ni_(0.3)O_2, LiCo_(0.7)Al_(0.3)O_2, and LiCo_(0.7)Cr_(0.3)O_2 resemble to that of LiCoO_2, while the charge-discharge profiles show the disappearance of the first voltage plateau at ca. 3.85 V due to the absence of the semiconductor-metal transition in doped materials.
机译：通过使用金属乙酸盐和琥珀酸的水溶液作为螯合剂的湿化学技术合成Li-Me-O材料。样品包括：LiMn_2O_4，LiMn_（1.8）Co_（0.2）O_4，LiMn_（1.8）Cr_（0.1）Cu_（0.1）O_4，LiCoO_2，LiCo_（0.7）Ni_（0.3）O_2，LiCo_（0.7）Cr_（0.3）O_2 ，以及LiCo_（0.7）Al_（0.3）O_2。通过X射线粉末衍射和FTIR光谱研究了产品的结构性能。为了比较Li-Me-O电池的可充电容量，使用锂金属作为负极，评估了4伏氧化物的电化学特性作为电池中的正极材料。 LiMn_（1.8）Cr_（0.1）Cu_（0.1）O_4的结构性质与LiMn_2O_4的结构性质非常相似，而它们的电化学性能表明在第36个循环时容量保持初始值的95％，这可以通过以下方式解释：尖晶石相中Mn〜（3 +）/ Mn〜（4+）比的变化LiCo_（0.7）Ni_（0.3）O_2，LiCo_（0.7）Al_（0.3）O_2和LiCo_（0.7）Cr_（0.3）O_2的层状晶格类似于LiCoO_2，但充放电曲线表明消失了。大约在第一电压的平稳段。由于掺杂材料中不存在半导体-金属过渡，因此电压为3.85V。

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