Development of Novel Vanadium Oxide Compound for Lithium Ion Secondary Battery

锂离子二次电池用新型钒氧化物的研制

基本信息

批准号：
13480137
负责人：
YAO Takeshi
金额：
$ 9.66万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13480137/
关键词：
lithium ion secondary battery positive electrode vanadium cobalt crystal structure Rietveld analysis tunnel-like space cycle performance リチウム二次電池酸化物正極活物質充放電

项目摘要

Vanadium oxides have been attracting attentions as a candidate for a cathode material of secondary lithium ion batteries because of non-toxicity, availability, low cost and safety. CoV_3O_8 was synthesized by solid-state reaction and the crystal structure was analyzed by X-ray powder diffraction and the Rietveld method. CoV_3O_8 has tunnel-like space along c-axis in the crystal structure. During the 1st discharge or lithium insertion, three potential plateaus were observed at around 2.3, 2.05 and 1.9 V. This indicates that lithium was inserted into CoV_3O_8 by three-step reaction. By the 1st discharge, lithium was inserted to x=2.6 in Li_xCoV_3O_8. In contrast, during the 1st charge or lithium deinsertion, only one plateau was observed. This means that the lithium deinsertion proceeded in one-step reaction. By the 1st charge, lithium was deinserted to x=0.6. In the 2nd discharge-charge cycle or later, both lithium insert ion and deinsertion proceeded in one-step reaction as in the 1st lithium deinsertion, and quantity of inserted lithium was almost equal to that of deinserted lithium. It was indicated that lithium was inserted into and deinserted from the sample reversibly. This sample exhibited excellent discharge-charge cycle performance. This cobalt vanadium oxide is promising for novel electrode material of lithium ion rechargeable battery.

钒氧化物由于无毒、易得、成本低、安全等优点，作为二次锂离子电池正极材料的候选材料而受到关注。通过固相反应合成了 CoV_3O_8，并通过 X 射线粉末衍射和 Rietveld 方法分析了晶体结构。 CoV_3O_8在晶体结构中沿c轴具有隧道状空间。在第一次放电或锂插入过程中，在 2.3、2.05 和 1.9 V 左右观察到三个电位平台。这表明锂通过三步反应插入到 CoV_3O_8 中。到第一次放电时，锂在 Li_xCoV_3O_8 中插入 x=2.6。相反，在第一次充电或锂脱嵌期间，仅观察到一个平台期。这意味着锂脱嵌是一步反应进行的。到第一次充电时，锂脱嵌至 x=0.6。在第2次充放电循环以后，与第1次锂脱嵌一样，锂嵌入和脱嵌均以一步反应进行，并且嵌入的锂的量几乎等于脱嵌的锂的量。这表明锂可逆地嵌入到样品中和从样品中脱嵌。该样品表现出优异的放电-充电循环性能。这种钴钒氧化物有望成为锂离子充电电池的新型电极材料。