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首页> 外文会议>NATO Advanced Study Institute on New Trends in Intercalation Compounds for Energy Storage, Sep 22-Oct 2, 2001, Sozopol, Bulgaria >ELECTRONIC STATE OF IONS IN MECHANOCHEMICALLY PREPARED INTERCALATION LITHIUM-TRANSITION METAL OXIDE COMPOUNDS
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ELECTRONIC STATE OF IONS IN MECHANOCHEMICALLY PREPARED INTERCALATION LITHIUM-TRANSITION METAL OXIDE COMPOUNDS

机译：机械化学制备的层间过渡金属锂氧化物化合物中离子的电子态

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Although being commercially realized, lithium-ion batteries are still the object of intense study aimed of further improving their electrochemical characteristics. The charge-discharge processes strongly depend on the crystal and electronic structure of the intercalation lithium-transition metal oxides used as cathode materials. Last years a great deal of attention was devoted to preparation of these compounds with unusual ordering (structural, magnetic, charge) and electronic state of transition metal ions, and a structure more stable to intercalation/deintercalation of lithium ions at discharge/charge processes, preventing a structural distortion and, thus, providing better electrochemical behavior. This can be achieved by a disordering of their structure. It was shown that the processes of disordering are followed by the processes of ordering of cations in these systems. For example, some authors showed that in the mixed lithium-manganese spinels LiMn_(2-x)Me_xO_4, where Me=Mg, Fe, the cation ordering in B-sites occurs. In the delithiated Li_(1-x)Mn_2O_4 and L_(1-x)CoO_2 the ordering of lithium vacancies was observed. While the processes of cation-cation long-range ordering occurring due to the interaction of d-electrons (long-range electron delocalization) are widely studied, the processes of short-range ordering (short-range delocalization) are poorly highlighted.
机译：尽管锂离子电池已经商业化实现，但仍然是旨在进一步改善其电化学特性的深入研究的目的。充放电过程很大程度上取决于用作阴极材料的插层锂过渡金属氧化物的晶体和电子结构。近年来，人们对制备具有异常有序（结构，磁性，电荷）和电子态过渡金属离子的化合物以及在放电/充电过程中对锂离子进行嵌入/脱嵌更稳定的结构进行了大量关注，防止结构变形，从而提供更好的电化学性能。这可以通过其结构的混乱来实现。结果表明，在这些系统中，无序过程之后是阳离子的有序过程。例如，一些作者表明，在混合锂锰尖晶石LiMn_（2-x）Me_xO_4中，其中Me = Mg，Fe，B位的阳离子有序发生。在去锂化的Li_（1-x）Mn_2O_4和L_（1-x）CoO_2中，观察到锂空位的有序性。虽然广泛研究了由于d电子的相互作用而发生的阳离子-阳离子远距离有序化过程（长距离电子离域化），但短距离有序化（近距离离域化）的过程却很少被强调。

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