NANOCRYSTALLINE MATERIALS FOR LITHIUM BATTERIES

机译：锂电池用纳米材料

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For a long time, only well crystalline materials have been considered as good electrodes for lithium-ion cells. Nanocrystalline materials are, however, being re-evaluated recently as 'nanoscience' advances. The electrochemistry of this kind of materials is much different from that of traditional crystalline ones because of their significant 'surface effects'. The nanocrystalline materials are reported to have an enhanced electrochemical activity when the first electrochemical step is insertion of Li ions (discharge process). As illustrative examples, electrochemical behaviors of some nanocrystalline materials such as LiMn2O_4, γ-Fe_2O_3, fluorine-doped tin oxide and potassium manganese oxyiodide, are presented and compared with their well-crystalline homologues. XRD, XPS, X-ray absorption and NMR spectroscopies were used as probe tools to differentiate the bulk (core) and local (surface) states. The "electrochemical grafting" concept will be given as a plausible explanation.

机译：长期以来，只有良好结晶的材料才被认为是锂离子电池的良好电极。然而，随着“纳米科学”的发展，纳米晶材料最近得到了重新评估。这种材料的电化学与传统晶体的电化学非常不同，因为它们具有明显的“表面效应”。据报道，当第一个电化学步骤是插入锂离子（放电过程）时，纳米晶材料具有增强的电化学活性。作为说明性实例，提出了一些纳米晶体材料，例如LiMn2O_4，γ-Fe_2O_3，氟掺杂的氧化锡和碘化钾锰的电化学行为，并将其与良好的晶体同系物进行比较。 XRD，XPS，X射线吸收和NMR光谱学用作探测工具，以区分体（芯）态和局部（表面）态。将给出“电化学接枝”概念作为合理的解释。

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来源
《NATO Advanced Study Institute on New Trends in Intercalation Compounds for Energy Storage, Sep 22-Oct 2, 2001, Sozopol, Bulgaria》|2001年|p.439-446|共8页
会议地点 Sozopol(BG)
作者
C. W. KWON; S.J. HWANG; A. POQUET; N. TREUIL; G. CAMPET; J. PORTIER; J.H. CHOY;
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Institut de Chimie de la Matiere Condensee de Bordeaux 87 av. A. Schweitzer, 33608 Pessac, France;

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正文语种 eng
中图分类能源与动力工程;
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NANOCRYSTALLINE MATERIALS FOR LITHIUM BATTERIES

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