Glass-ceramics with LiFePO4 crystals and crystal line patterning in glass by YAG laser irradiation
Glass-ceramics with LiFePO4 crystals and crystal line patterning in glass by YAG laser irradiation
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DOI：
10.1016/j.ssi.2007.03.003
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发表时间：
2007-05-15
影响因子：
3.2
通讯作者：
Komatsu, Takayuki
中科院分区：
文献类型：
--
作者：
Hirose, Keita;Honma, Tsuyoshi;Komatsu, Takayuki
提出了制备LiFePO4晶体作为下一代锂离子二次电池正极材料的新途径。一种是在电炉中使用常规热处理使前驱体LiFePO4玻璃析晶，另一种是利用LiFePO4晶体的组装在At.用波长为1064 nm的连续激光照射玻璃表面。制备了组成为26Li(2)O-43FeO-5Nb(2)O(5)-26P(2)O(5)(摩尔分数)的LiFePO4玻璃，并通过常规晶化实验证实了LiFePO4晶体的形成。晶化样品的室温电导率小于10(-9)Scm(-1)，表明Nb5+离子没有掺入到LiFePO4晶体中。用功率为70~100 mW、扫描速度为25µm/S的激光照射玻璃，通过X射线衍射谱和显微拉曼散射光谱证实了LiFePO4晶体的形成。X射线衍射图显示了LiFePO4晶体在谱线上的取向。(C)2007 Elsevier B.V.保留所有权利。
New routes for fabrications of LiFePO4 crystals being a potential candidate for use as cathode materials for the next generation of rechargeable lithium ion batteries have been proposed. One is the crystallization of precursor LiFePO4 glasses using conventional heat treatments in an electric furnace and the other is the patterning of crystal lines with an assembly of LiFePO4 crystals at. the glass surface by irradiation of continuous wave Nd:YAG laser with a wavelength of lambda = 1064 nm. A glass with the composition of 26Li(2)O-43FeO-5Nb(2)O(5)-26P(2)O(5) (mol%) corresponding to a stoichiometric Li(Fe,Nb)PO4 crystal was prepared, and the formation of LiFePO4 crystals with an olivine structure was confirmed through a usual crystallization. Electrical conductivities at room temperature for the crystallized samples are less than 10(-9) Scm(-1), suggesting that Nb5+ ions are not incorporated into LiFePO4 crystals. Nd:YAG laser with powers of 70-100 mW and a scanning speed of 25 mu m/s was irradiated to the glasses, and the formation of LiFePO4 crystals was confirmed from X-ray diffraction (XRD) analyses and micro-Raman scattering spectra. XRD patterns suggest orientations of LiFePO4 crystals in the lines. (C) 2007 Elsevier B.V. All rights reserved.