SOLID-STATE CHARACTERIZATION OF REDUCED SILVER VANADIUM-OXIDE FROM THE LI/SVO DISCHARGE REACTION
SOLID-STATE CHARACTERIZATION OF REDUCED SILVER VANADIUM-OXIDE FROM THE LI/SVO DISCHARGE REACTION
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DOI：
10.1021/ic00103a021
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发表时间：
1994-12-07
影响因子：
4.6
通讯作者：
TAKEUCHI, ES
中科院分区：
文献类型：
--
作者：
LEISING, RA;THIEBOLT, WC;TAKEUCHI, ES
通过对还原后正极材料的固态表征，研究了锂还原银钒氧化物（SVO，AgV 2 O 5. 5）的过程。在0 < x < 3.3的范围内分离出LixAgV2O5.5产物，其中相对于Li的相应电压在+3.25至+1.8V的范围内。X射线粉末衍射分析表明，SVO材料在0 < x < 1.2的范围内失去结晶度，同时形成元素银。此外，样品的c晶格参数在0 < x < 3.3的范围内从7.56埃线性降低到6.55埃，表明锂化材料中的显著结构变化。DSC和电阻率测量也表明这些产品的结构变化。钒和银组分的氧化态的化学分析和X-射线粉末衍射结果的基础上分配，并与FT-IR和室温磁化率测量的结果一致。Li/SVO电池的伏安法显示多个波，这与物理表征研究的结果相关。这些实验表明，锂电池中SVO的还原可以产生混合价材料，在同一样品中可能存在钒（V）、-（IV）和-（III）。
The reduction of silver vanadium oxide (SVO, AgV2O5.5) by lithium was studied via the solid-state characterization of the reduced cathode material. LixAgV2O5.5 products were isolated over a range of 0 < x < 3.3, with corresponding voltages vs Li ranging from +3.25 to +1.8 V. X-ray powder diffraction analysis showed that the SVO materials lose crystallinity over the range 0 < x < 1.2, with the simultaneous formation of elemental silver. In addition, the c lattice parameter for the samples decreased linearly from 7.56 to 6.55 Angstrom over the range of 0 < x < 3.3, indicating significant structural changes in the lithiated material. DSC and resistivity measurements also suggested structural changes in these products. The oxidation states of the vanadium and silver components were assigned on the basis of chemical: analysis and X-ray powder diffraction results and were consistent with the results of FT-IR and room-temperature magnetic susceptibility measurements. Voltammetry of Li/SVO cells displayed multiple, waves, which correlated with the results of the physical characterization studies. These experiments indicated that the reduction of SVO in lithium batteries can produce mixed-valent materials, with the presence of vanadium(V), -(IV) and -(III) possible in the same sample.